Jump to content
SAU Community

Recommended Posts

Hi all,

Just installed my Walbro GSS342 in tank pump now in the dark, and I can tell u its no 1 hour job, I'm no noob, have done my own FMIC install, spark plugs etc, and I can tell u the fuel pump job I found almost as hard ..

I have a problem - it is missing - like hesitating in low rpms below 2000rpms in 1st, 2nd and 3rd, havent driven long enough to see if it misses in 4th and 5th, its just small misses and once the revs go up, it feels way more responsive than my stocko pump, revs to 7000rpm very freely, cleanly and quickly where the stock one took a while.

Why is it missing in low revs only (dosen't miss in idle at all - idle is now sort of 1000rpm, before it was 800rpm). I did a thorough job and didnt miss anything, does it need a re-tune??? I will take it to be tuned the coming weekend, it is running nistune at the mo but hasnt been tuned at all..

Please help fellas, I'm stoked AND hugely disappointed too... thanks

current mods are - 3" turbo back zorst, boost controller set at 12psi, pod in cold air box, FMIC, nistune (not tuned yet) - running stock r34 maps..

Any thoughts on why its missing after the pump install?? Its not major, just a few hesitations/ jolt kinda thing then goes hard after that to redline..

I'm thinking it needs a re-tune or the pump is not able to push enough pressure at low loads..

It wont have anything to do with the tune, does sound strange if its only lower revs and not through the whole rev range.

What pump was in the car before?

I've installed the same pump in my old hr31 and a mates r33 and never had any problems.

it was the stock UNISIA JECS pump- almost the same size as the Walbro by a few millimeters, yeah mate, high rpms after 2500-3000 all the way to 7000 is much cleaner and freer to rev now no misses at all, can feel the difference and I know its not my mind playin games..

Had a discussion with my flatmate, he said if its fine above 2500rpms and revs much quicker and makes more sharply noticeable power, then that has got to do with the tuning which is what I think - ie why its missing in low rpms..

If the old pump had some issues keeping proper pressure for some reason then maybe it is the tune, but I'm fairly sure the old pump would have problems keeping pressure once you got on the gas even more so than low down.

TBH sounds like air bubbles or something like that, whereby lowdown the restriction is noticeable, but up high not so much. Lastly, what happens if you turn on/off music/AC/headlights, that should narrow down if it is electrical supply issue (possible if the alternator is on the way out).

Ultimately, just pay your mechanic $50 to diagnose it properly before something breaks :)

  • Like 1

I was also thinking about voltage issues - man it is frustrating, was expecting it to run smooth, but yes, compared to the stock one which had dangerously high a/f of aaround 13.7 and up, I can feel a good amount more power now in the mid-high rpms and very much free to rev now - revs quick n smooth to redline - just the low rpm stutter/hesitation for 1-2 seconds which was never there..

If the old pump had some issues keeping proper pressure for some reason then maybe it is the tune, but I'm fairly sure the old pump would have problems keeping pressure once you got on the gas even more so than low down.

TBH sounds like air bubbles or something like that, whereby lowdown the restriction is noticeable, but up high not so much. Lastly, what happens if you turn on/off music/AC/headlights, that should narrow down if it is electrical supply issue (possible if the alternator is on the way out).

Ultimately, just pay your mechanic $50 to diagnose it properly before something breaks :)

Ummm, what do u mean before something breaks - I hope nothing is goin to break with this minor? issue!

btw, I had to use my old sock as the walbro didnt come with one, it has a bit of play sitting against the bracket - I'm just worried that the sock to pump connection is not nice and firm - ie there is some play as I also used the stock isolator rubber cap, can the pump operate without the sock? By play I mean u can pull the sock nozzle away a bit and see a bit of the pump inlet.. worried about this

thanx man will try that if the tune dosent fix it, all i can say is that I am completely stoked with the positives of the fuel pump install - I expected a 0rwkw increase, but it FEELS like it has gained at least 30-40rwkw, completely different beast now, apart from 1-2 misses/ gasps below 2k rpms, after that it pulls like a train all the way to 7krpms - the response is very sharp and whack-in-the-back-strong throughout and doesn't taper off at all, now i know that the previous stock pump wasnt supplying enough fuel for my current application..

just cant wait for the tune, that should get me roughly 20rwkw or more hopefully.. love it..

For all those doing stage 1 mods - exhaust, intake, boost, FMIC, an aftermarket fuel pump is a MUST. I had always thought it was a stage 2 mod.

Yeah you never said if you actually did the rewire as this is the main problem with walbros. And he means you

Might break something if there is air in the line as in it will lean or and detonate etc

Confirm you've done the rewire and it is getting 14ish volts on idle etc

no rewiring done mate, mite have to do that later, but will see if the tune can yield anything goood... as i said it is only missing below 2k rpms, above that it is so MUCH better than before

simple fact. If youve only change the fuel pump, the tune should be fine (SHOULD be not WILL be)

Do the rewire first, as it will cost next to nothing to do. Tunes are not cheap especially if you do that then find out its the pump not getting enough voltage

Or youll end up spending just as much as it would have cost for a Nismo/Tomei pump like I suggested in the first place. FYI I installed mine and the car ran no different afterwards.

Do the re-wire first

thanks, I'm only getting a tune cos I just got nistune installed a coupla weeks back and havent had a tune yet, so fuel pump problem or not, I am getting a tune regardless, and will see about re-wiring - saw a write up, but theres no pics, also someone suggested I should ground the fuel pump control modulator to the chasis or something - have no idea where or what that is he he

Just putting a fuel pump doesnt increase the power in the car it just enables it to run more power just like a front mount,you will however make more power when you combine it with such mods as turbo injectors where you require more fuel to be pumped out so not sure what your talking about there.

The problem does sound strange as it is missing then working fine, would have thought it was surging from maybe mounting the pump to high but your saying it in low revs and then its fine.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • That is the serial number of your block
    • best advice yet.  so between the elite and the nexus... much of a difference?  cost is damn near identical (only $170 difference).  thank you!!!
    • Hi everyone, I've found some free time to write up my "build thread" which is 10% 'build' and 90% fixing problems of a skyline that has endured a lifetime of abuse. I will start with the backstory & get everyone up to speed. Ever since I was just a teenager in high school I have had a spot in my heart for the shape of an R32 rivaled only by the look of an S13, my mates & I all having overly ambitious dreams as one does about having the sickest car in the school carpark. Unfortunately I started my journey of cars down the path of the Silvia and after spending years of putting up with the underwhelming SR20 life I dipped my toes into the 1J Toyota pool for a small moment until my true compass brought me back to that incomplete dream of an R32. At this point the trawl through marketplace, gumtree, carsales etc. starts looking Aus wide for an affordable example in the current economy which was extremely barebones compared to the good old days of sub 10k cars everywhere. Out of the handful of cars in the budget at the time I settled on a 1992 R32 GTS-T that was located in Adelaide. It had caught my eyes as it was similar price to the others on the east coast and had been RB25DET NEO converted and an open door respray in a custom colour based off TH1. It was also a stand out to me because it already had some NSW registration left which saved me the hassle of getting it on the road in my state. As for mods I was told it was pretty stock other than the motor swap, a nistune to run it, and an unknown fuel pump. My first mistake was trusting the seller blindly that the car was in good condition in all aspects and decided to purchase the car unseen other than some walkaround videos & pictures as the flights down there were very expensive at the time. The price of getting it transported to my door from Adelaide from Sydney was surprisingly cheaper than the flights at the time. I was told the few issues it apparently had was only 1 speaker not working, some cracked or missing trims, and it had been rear ended at some point but had been all professionally repaired (this is all foreshadowing at this point). I paid for the car, and then booked the interstate transport. Now at this point save your criticism as I already know how stupid I sound in hindsight, this was a major lapse of judgement and I accept the problems that followed. I spent the next 2 weeks in a crazed excitement knowing I am finally the owner of an R32 & that it was on its way. I started preparing as when negotiating with the seller I opted out of the Lenso wheels as they aren't really my style & I wanted a set of genuine wheels, and the bucket seats in the car as I am 6ft5 and not the skinniest guy so I had my predictions that I wouldn't fit in them anyway. Due to this the car was put on a set of R33 stockies and some average condition R33 seats that he had laying around. While I waited for the car to arrive I went and picked up a pair of R32 seats and some R32 GTR wheels to fit nicely on it once it had arrived. Being the first time I had done anything like this or had a car transported interstate I had no clue how the logistics of it were, I chose my work as the delivery address assuming it would arrive at some point in the middle of the day. You can imagine my surprise when I wake up to a call from the truck at 5:30am telling me his about 20 minutes away. When I tell you that was the fastest drive to work I have ever done, I managed to catch up to the truck before it even got there. Spent the hours before work taking in the car and living my first experience with one, I had never even been inside one so I spent some time getting familiar with the interior before doing the seat swap. Here is my first proper photo of it as the sun rose in the background. I also noticed it had the switch for the electronic front lip which was a pleasant surprised but sadly upon looking it didn't actually have the lip or the motors or even any wiring behind the switch. As I swapped the seats, the extremely questionable history of the car started to show itself starting with some really dodgy seatbelt buckles that had been extended for some reason with horrendous welds. This was followed by me noticing the drivers side front was quite bent up to which the owner then decided to let me know it had been hit in the front at the same time as the rear end. It also had a pretty leaky power steering rack and the pump was screaming for its life. By now I was a little on edge but I had to get to work for the day, I sent the car down to my mechanic to get the fluids changed and a general check over as I started to question what I had got myself into. I packed the GTR wheels into the car to get put on while it was there as I ran out of time which was a struggle because the handle to release the fuel door/boot was non-existent and just had the end of the cable tied to a bolt. It wasn't much of a surprise when I got a call saying that it looked like the fluids hadn't been done in quite some time. Although that didn't come as a shock, it did catch me off guard when I was told he couldn't open the boot which had the wheels in which I just had open not long before. Mission #1 was to squeeze through the back panel and open the boot from the latch while loaded with a set of wheels which to my amazement he pulled off after a bit of a struggle to reveal there was nothing holding the cable mechanism in place where it sits at the fuel cap. After that dilemma was solved the mechanic did an inspection over the car while on the hoist with nothing too interesting being found other than the expected crushed frame rails. It seems to have had some bilstein shocks installed at some point and judging by the AWD sump that has been sealed up I suspect the NEO is out of a stagea. By the time I got the car back and was ready to have my first drive home in it I was still excited but now quite anxious with the car already. First stop was to the servo to get a nice fresh tank of fuel as I had no idea how long it may have been sitting around for before I bought it. It sat quite nicely on the GTR stockies I must say. Now my drive home from work is short only being a 15-20 minute commute so the chances of anything going wrong is quite small right? WRONG. As I go over a speed bump only 100m from home I start to smell the dreaded smell of electrical burning and my lights drop out and shortly after the car dies. I am in extreme panic at this point thinking the car is going to burn down on its first drive before I have even had a chance to insure it. I move to the bonnet as quick as I can and lift it up, and as I go to grab the bonnet prop my brain is in such a frenzy that it takes me a second to realise my hand is being burnt to a crisp. This is where I notice that there is no plastic clip for the bonnet stay and when I have gone over the speed bump it has knocked the stay onto the positive terminal of the battery welding itself there. Levering it off with a nearby stick I sat there for a few minutes making sure nothing was going to burn down while waiting for a mate to come jump start me. My main stress was that I could've absolutely cooked the ECU or any other electrics. I was relieved when the car started fine with jumper leads on it but it would die as soon as the headlights were turned on so I carefully limped it home with no lights and decided it was a tomorrow task. You can see here where the stand sat on the positive terminal. Thankfully with a new battery the car behaved and seemed healthy. It was pretty smooth sailing for a little while getting to enjoy dailying the car. Interior wise it was pretty much as the seller described except for the the lack of working speakers, the digital controls had no power, and the headunit would randomly turn off & on. I installed a quick release I had laying around from an old car to help with getting in & out of the car and a nice momo wheel. I bought some oem side skirts to match the rear pods that were on the car already, who said a skyline can't be a practical parts mover. Test fit looks good! Found a good deal on a GTR wing & boot that I couldn't turn down. At this point the skyline was being too good to me and had to throw the spanner in the works again. First incident was as I was coming off the motorway and heard a bang and an awful grinding noise. As I pull over down a side street to investigate I notice my whole exhaust has basically fallen off and is dragging on the ground. After waiting around to let it cool to the touch I managed to get it back on its hangers. Thinking it was a weird 1-off instance I didn't think much of it until it happened to me again a few days later to which I see this time the middle hanger has snapped in half and the rear hangers have snapped at the welds. I manage to get the car in to a shop to get the hangers welded and while there I notice that my intercooler has broken its brackets and was being held up only by the piping. Quickly got that sorted and got some thicker brackets out of steel plate to support it all. Just when you thought at this point the car might give me a break, I fill the car up on my way home from the fabricators shop and after I pay I walk back to a good portion of my liquid gold on the floor. I just shrug it off at this point in exhaustion and call it a job for another day. The car had other plans for me though as the next morning on my commute to work, I am halfway there when I notice I am struggling to shift gears. I get lucky with a run of no red lights to work and find some time on my lunch break to investigate the problem. The slave wasn't leaking and the master still had fluid so I was left confused until I contorted myself under the dash and noticed the whole pedal moving loosely side to side when pushed in. Upon pulling it out of the car I found it to be multiple snapped spot welds on the clutch pedal bracket and the actual face of the pedal that sits against the firewall had snapped in half. I jerry rigged it with nuts & bolts at the spot welds but I will need to come back to this in the future and replace with one of the strengthened nismo brackets available. I then got to enjoy the car for another 2 months of cruising and dailying it, peep the obnoxious fireballs it would shoot every shift on the dodgy tune that was on there. On a sunday drive in that period of working car, I was on my way home on the motorway when I heard a slapping noise on my front left to which I pulled over to find my indicator had ejected itself from the car. Nothing a bit of tape can fix lol. I then bought some smoked indicators but after I realised I didn't like the look I found some damaged series 1 indicators. I repaired the tabs with some cut up cards and they looked good to me. My next venture was the hunt for some wheels, I test fit my mates Work Equip Spinning that were tiny 15" and I wasn't sold on the small wheel look. I ended up finding a killer deal on some Rays Volk Racing Group C in 17x8.5 & 17x9 that had been rebuilt many years ago and not ran on a car. I am still yet to get these on the car as they require some specific adapters and shank style lug nuts but I think they will look awesome. At this point my 2 months of reliability had ran out and on a cruise with some friends I suddenly lost the ability to shift gears again and thankfully could get it home by taking main roads and not having to stop. This time my master cylinder was bone dry and the culprit was the clutch slave that had decided to let go. It was a quick and fairly easy fix, but in my luck bad things always come in waves. Only a few weeks later I am on my way home from World Time Attack when the car completely shuts off while coasting down a hill, I try crank it while I still have momentum but no luck. Thinking I might have killed the fuel pump from running it low or maybe killed a CAS because the symptoms seemed to line up somewhat, I opt to get the car towed to a workshop to get fixed up on the Monday. When it gets there they get stuck into diagnosis and the CAS wasn't sending a signal to the ECU, and the fuel pump was also dead so it was comical for a small moment there. They replace the dead fuel pump when one of them notices some smoke coming from the passenger kick panel. Boy oh boy this is where it gets very bad and very expensive. I am not sure who wired the car when the NEO swap was done originally but I hope they never attempt auto electrical again as I am lucky that this handywork only managed to short and kill the ecu and engine loom and not do more damage. This is the point where you could say the 'build' started but not by choice. After some deliberation with my bank account I opted for a Haltech Elite 2500, RB terminated loom, and WB1. While I wish I stopped there and did the minimum of get the car running and leave it at that, I slipped into the rabbithole and decided I wanted to make the most of getting a retune and throw some bolt ons at it and see what it would do. I then threw together a bit of a mix n match build of marketplace deals starting with a GCG GTX3076R, a turbosmart FPR6, 980cc injectors, walbro 460, jackspanian ffp, throttle & fuel rail. At this point it was coming along nicely, the shop was making quick work of it and the bay was looking a lot nicer without the stock crossover intake. I also got them to replace the noisy centre bearing while it was off the road. Then we couldn't get an OEM CAS to talk to the haltech so ended up getting a PRP Street Trigger Kit for it.   While the car wasn't playing nice it decided to kill the stock alternator too so went with an LS1 alternator conversion kit. By now the car was pretty much done and ready to go but come tune day the car kept throwing the timing out every time it would warm up. Upon further investigation it seemed to be warping the PRP trigger bracket when the metal would get hot and expand which would cause the sensor to lose timing as it moves. Herman advised that they have seen the issue a few times now and don't know what the cause is. At this point I decided to switch to the PRP Pro kit with the crank trigger and considering the whole timing belt would have to come off I decided to get a new timing belt kit with water pump fitted. The car would now run fine with no issues and it was finally tune time. It ran up a healthy 275kw but ran out of boost due at 17psi to the rear housing being undersized. At this point the clutch also started slipping and due to it still being a weak RB20 box the tuner set it up to ramp from 8psi up to 17psi with the revs so that it wouldn't load up the clutch and box as hard. Car drives like a dream now. With the car back on the road I could return my focus to the smaller details, starting with getting a set of badges for the hood and quarters. I was struggling to drive with shoes on and I noticed that my accelerator pedal sits higher than my brake and clutch, if someone could confirm how it should sit that would be great. Next little changes was a killallwipers rear windscreen wiper delete, I also got some interior bits I was missing such as parcel shelf speaker covers, wiper trim cover, and boot floor and trims. Finally made it to a SAU NSW event which was awesome to cruise with a bunch of likeminded individuals. Another creature comfort I decided to look into was my lack of A/C. Since the Haltech got wired up the digital climate would power up now, and would blow but no cold air. First issue noticed was the lack of belt on the A/C compressor. After sorting that to no avail, it also had no A/C gas in it, but turns out the condenser has a huge leak. We are almost caught up on the story so far, but at the start of this month while coming into a driveway I heard a huge clunk in the front end to which I got out to witness whatever dodgy camber arms someone installed in this at some point decided to snap in half and I feel very lucky that it didn't happen at speed. Managed to get the car fixed the next day with some replacement GKtech arms. Next problem to address was the leaking gas tank from months ago. Checked the pump hanger seal first but that was fine, stuck my camera up after filling up to try scope out the leak which looked like the breather hose. Got the car up on a hoist prepared to drop the tank when I reached up to feel with my hand and I could feel that the hose clamp was missing and soon after felt that there was a gaping hole in the top of the hose. Replaced and tested and the car holds its liquid now and doesn't give me a fume headache whenever I drive it now. Finally have caught up and now onto fixing my latest issue which is the lack of dash light when driving at night, checked fuses first, then when searching I found the common problem of the headlight switch burning out but mine looks fine. Next test will be plugging a known working headlight switch into my car to tell if my switch is dead. Sorry for the long read but I wanted to be thorough, so if anyone made it this far I salute you soldier. Enjoy the rest of your day and I will keep this updated with issues I find/solve and any cool mods I can do inbetween. Merry Xmas!
    • can someone tell me what information a block number of 330680a on a rb25det engine specifies?
×
×
  • Create New...