Dual Intank Pump

[jay-rod]

Yoyo

Anyone have any pics of there dual intank setups?
If not any pics, any suggestions on what not to do.

thinking of chucking my other 255 in my 34 for better flow as i think im nearing the limit with a single one on 85.

[Blackkers]

how much power are you making and at what boost and base fuel pressure?

i'm maxing out mine but big injectors help as fuel pressure drops in the top end.

making around 300rwkw on 20psi but I can't be sure as the car was wheelspinning like crazy on the dyno

[jay-rod]

im at about 270 at 16 psi.

Cant remember base fuel pressure, but wot it was about 60psi ( if i remember correctly)

i have 1000cc injectors atm.

It cant hurt to put another one in right?

Ill run it off another 12v line to a relay, and have a y pipe connecting to 2 intank.

[Blackkers]

base pressure sounds factory. 3Bar or 43.5psi.

well, you don't really need one, and 1000cc injectors are more than big enough to compensate if the pressure drops slightly and at 16psi it probably wont. Any tuner will be able to do this.

Personally I wouldn't install the 2nd pump but it sounds like you're going to do it anyway

keep in mind you need to supply around 16-20A of current at 60psi fuel pressure with 2 of those pumps

Edited June 15, 2014 by Blackkers

[jay-rod]

Wouldn't i need a pressure regulator to compensate?
Using the stock one currently.

[GTSBoy]

You don't need the pump.

Additionally, where a situation actually calls for a double pump setup (where it is just not possible to get enough flow with just one), then you cause the risk of failure of just one pump to leave the engine running, but lean. Bad, mmkay?

[jay-rod]

That makes sense.

Wish my 460 i bought wasn't a dud

Couldnt even get over 45-50 psi wot.

Edited June 15, 2014 by jay-rod

[scotty nm35]

More likely your fuel filter is restricting flow, unless there is something wrong with your pump install...

Does it have full 14v and e85 compatible submersible hose in the tank? Have you checked the terminals on the pump lid are clean and corrosion free, and not melting?

[jay-rod]

went through 2 filters just incase, also did a dyno run without a filter...same thing.

Direct feed from battery to a relay, stock nissan hose intank, works well with e85.

As soon as i put the 255 back in...works fine..

[SiR_RB]

Just buy a genuine 460lph walbro and be done

[Kinkstaah]

The above is really the best advise. Unless you are pushing 430kw+... you do not need a 2nd pump and the farking around that is involved with it.

[jay-rod]

Just buy a genuine 460lph walbro and be done

Thats the thing...i did..

I dont want to name who i got it from, but it was a dud.

I dont want the messing around replacing it...

And i dont want another dud lol....

But, i guess ill have to..Kudos Motorsport i guess ill get it from this time?

Edited June 16, 2014 by jay-rod

[scotty nm35]

The problem is there is a restriction inside the ryco style filters, not that is was dirty. (unless you tried some kind of highflow stainless mesh filter) I have seen that exact fault many times and most suspect the pump or injectors are the problem. If you had simply bypassed the Ryco it would have proved it in 1 dyno run.

As far as I know there are no knockoff Walbro 416 pumps, but some are the original petrol variant. These are cheaper but will fail quickly on e85. If this is what you bought, and it doesn't have the sealed power connector, it could explain what happened.

[ARTZ]

he did do a run without a filter Scott ...

went through 2 filters just incase, also did a dyno run without a filter...same thing.

Direct feed from battery to a relay, stock nissan hose intank, works well with e85.

As soon as i put the 255 back in...works fine..

Also I only ever used a ryco filter, had no worries....maybe my pump was a little better, but a 255 should keep up alright if its wired up properly..You checked voltage at pump?

[jay-rod]

It was def a e85 style, sealed power connector.

Ill put some picks up tomorrow if i find it...kinda just threw it somewhere pissed of at it...lol.

And yes we did a dyno run without a filter.

[scotty nm35]

Oh, didn't read that.

These are very basic pumps, unless they have had water through them they are very robust and hard to block. Can you post a pic of it if you have one?

I just cut an e85 walbro apart today, very interesting inside due to being a turbine only pump. No wonder they are so quiet... I should post some pics in here.

[scotty nm35]

Could it have been the reg at fault perhaps? What if the spring had no more to give?

Was the pressure dropping off at the top end, or was it a steady 50psi?

[ARTZ]

reg or whats the wiring like to the pump, have you used a thicker gauge wire..?

my money is on its not getting enough power...

Lets say the 255 is getting just enough power , then the 460 would die in the ass with that same power..

would explain both your problems..

[jay-rod]

It was a couple of months ago now, so hard to recall

But im pretty sure it went like this.

Idle pressure was fine, wot it would build to ~55-60 psi then drop back down to ~45-50 at full boost /16psi around 3800 -4000 rpm

Put the 255 back in and it held a steady ~60-65 psi ( my numbers could be off, but you get the general idea )

EDIT

Could it be my wiring is the problem?

I used to have amp/subs in the back, which i no longer have, so i used the same Amp wire ( 4awg i think ) to my relay.
Do you think the large gauge wire could be to low resistance? Bare in mind its many fine strands inside the 4awg, not thick wire.

Edited June 16, 2014 by jay-rod

[scotty nm35]

Bigger wiring the better, and I always solder the connectors. The main problem is the thin wires at the plug on the tank, and the undersized plug pins. They need to be clean or they can melt causing similar symptoms.

Here is the Wally, not much to see, but you can easily see the rust from excess moisture. This pump was seized, drawing 30 amps, so keep your fuse at 25A.