044 "in Line" Or "in Tank" For Gtr

[Shaun]

GDay,

Im aiming for about 350rwkw from my gtr engined r32 gtst (built engine with highmount gt35), and im going to put a Bosch 044 in line with a Walbro 500hp pump in the tank.

Ive been told that if i use an 044 in the tank, ive got to always have a quarter tank of fuel due to pick up problems, as fuel starvation could result. Is this the same if i use the 044 in line with the Walbro as a lift pump?

Thanks for any info,

Shaun.

PS. Just before anyone asks; I dont want to use a surge tank due to legality reasons and the stupid cost of fittings. The pump in line will be more than adequate for my application.

[T04GTR]

its always a pain setting up a fuel system. id personaly go for an external 044 with the stock one as a lift pump to a surge tank.

for it to be legal it has to be sealed up(in a box like in two06l in hpi mag.)

if you arnt going to drift it or put slicks on it a intank one should be ok.

but yes 1/4 tank is needed to avoid surge.

[R31Nismoid]

i would have though there is no point having a smaller lift thats feeding a bigger one down the line unless you are using a surge tank as a supply point.

I mean think about it, the walbro can only pump so much to the bosch unit... so its no going to flow anymore than what its given which would render the 2nd pump useless in my mind

just drop the bosch in the tank, that's all you'll need.

[Shaun]

i would have though there is no point having a smaller lift thats feeding a bigger one down the line unless you are using a surge tank as a supply point.

I mean think about it, the walbro can only pump so much to the bosch unit... so its no going to flow anymore than what its given which would render the 2nd pump useless in my mind

just drop the bosch in the tank, that's all you'll need.

<{POST_SNAPBACK}>

Nah, apparently the Walbro will flow many times its rated output if there is no (or significantly decreased) resistance to flow; ie the Bosch pump 'in line' just down stream. Sydneykid has mentioned to me that he has seen this on about 50 high powered gtrs without problem.

I understand what you mean though.

Has anyone else out there had any experience with the Bosch pumps in line with a lift pump?

I have been told that i can put the Bosch 044 in the tank, but i was just thinking it was a bit dodgy, as its designed as an external pump isnt it? Correct me if im wrong!

I really dont want to do the surge tank thing; i dont think its necessary for my application.

Thanks,

Shaun.

[R31Nismoid]

you can get an in-tank 040 mate

[Warpspeed]

I really don't want to do the surge tank thing; i don't think its necessary for my application.

Thanks,

Shaun.

<{POST_SNAPBACK}>

No need for a surge tank, just plumb both pumps in series. The big pump will suck pretty hard and relieve the small pump of just about all pumping pressure load. But the small pump is still required to raise fuel up to the big pump and prime it.

Do some flow testing, you will find the 044 will not be restricted by keeping the original smaller in tank pump.

[gtst25]

I've personally fıtted an 044 ın tank ınto my r33.

A total bıtch of a job though - I've spoken to a tuner who's been tunıng a lot of hıgh powered skylınes sınce the late 80's and he's allways used the standard fuel pump as a lıft pump and gone an external 044 or whatever - no problems.

If I dıd ıt agaın that's what I would do - when you sell the car you can easıly remove your good fuel pump ıf you lıke.

That saıd I've had no problems wıth fuel starvatıon from low tank levels wıth my 044 - depends on how you fıt ıt - you've just got to get ıt as low ın the tank as possıble and don't forget to keep the check valve so your fuel system ıs allways prımed.

Cheers

[Shaun]

Cool. Thanks for your input guys. Ill stick with the 044 in line and see how it goes.

Shaun.

[lukits01]

Where are you going to mount the fuel pump for external setup without surge tank?

[T04GTR]

it seemed to work for mercedes on there higher powerd k-jet models:300e-24 etc.

they used 2 smaller 910size pumps inline. to get the 80 odd psi and flow.

they all had small lift pumps in the tank.

so i spose you could do it aswell.

[Shaun]

Where are you going to mount the fuel pump for external setup without surge tank?

<{POST_SNAPBACK}>

From what ive seen the 044 is just 'in line' underneath the car or something mounted in a normal bracket. I dont really know the ins and outs of the installation though. Anyone else seen it done with success?

[predator]

smash the walbro with a hammer..

and keep the stock GTR pump for the intank, followed by the bosch outside..

[TurbostyleR]

i have personally gotten close to 400rwhp out of my walboro intank fuel pump and thats using an SR20DET motor...

Im going to see what the limits of this little walboro are but im pretty sure its still got plenty of life it in yet...

However it is good to know that you can mount fuel pumps in series without a surge tank! I know what I will be doing if the walboro runs out of puff...

[R33RWKW]

I've got a Walbro intank & a Bosch 044 with sealed surge tank. Both are plumbed in series & I havn't had any problems.

Both myself & Ben at RacePace Motorsport was happy with the end result - 285RWKW. I will be replacing my 10psi Wastegate spring in soon with a 14.5 or 15psi spring to try & reach 300RWKW.

I always fill up when the tank reaches 1/4 full or just under, due to any crap which might be sucked through the system.

It might sound like I'm being too careful, but I know alot of people who do the same thing in different stock cars aswell.

Cheers

[Sydneykid]

I always fill up when the tank reaches 1/4 full or just under, due to any crap which might be sucked through the system. Cheers

<{POST_SNAPBACK}>

I hear that a lot from people. But I subscribe to the reverse logic. I always run my tank down to almost dry before I refill it. That way any little bits get picked up and deposited into the fuel filter regularly. Otherwise they build up in the tank and that one time when you HAVE to use a full tank, you get this great big lump of crap all getting picked up at once. Probably enough to block the filter and cause all sorts of problems.

I figure that's why I change the fuel filter regualrly to get rid of the crap. It always sounded a bit strange to me to not use the fuel filter for what it was intended for. But maybe that's just my perverse way of thinking.

cheers

[R33RWKW]

I hear that a lot from people.  But I subscribe to the reverse logic.  I always run my tank down to almost dry before I refill it.  That way any little bits get picked up and deposited into the fuel filter regularly.  Otherwise they build up in the tank and that one time when you HAVE to use a full tank, you get this great big lump of crap all getting picked up at once.  Probably enough to block the filter and cause all sorts of problems.

I figure that's why I change the fuel filter regualrly to get rid of the crap.  It always sounded a bit strange to me to not use the fuel filter for what it was intended for.  But maybe that's just my perverse way of thinking.

cheers

<{POST_SNAPBACK}>

Thanks Gary, that is better logic. From now on I will change my fuel filter more often. How often is satisfactory, in your opinion but not overkill? 10,000km or more/less?

P.S - I managed to sort the strut-top problems out for my new Whiteline/Bilstein kit - should have the car back Thursday night.

Cheers

Chris B)

[PHATR32]

hey

one thing i never understood is why the pump is in a cradle, and how the fuel get into it??

my tank is and the fuel pump is currently out and i have a 044 sitting in room waiting to be installed.

so the best option would be to install the 044 exactly the same way the stock gtr pump is installed?

steve