Fuel System Setup And Jet Pump

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Alright i couldnt find much from searching, but im about to move to a external fuel pump setup with surge tank to replace my single walbro 400lph pump. I'm looking at a fuel system capable of supporting 650-700rwhp on e85.

My idea is to use 2x044's pumping into the standard feed and return lines, then have -6 feeds from the end of the hard lines to each end of the fuel rail and have a additional -8 return line to the surge tank.

I'm interested to know what others have done with the return line from the surge tank to the main tank, is it worth upgrading to -8 hose with a bulkhead fitting on the tank to lower the restriction of returning fuel or just use an adapter into the factory return line from surge tank?

also my fuel rail has a -6 return to the fpr, is it worth modifying to -8 or is it all overkill

Also if i did use a bulkhead fitting whats the best option with the jet pump, is it necessary as it looks to be quite a restriction to a higher capacity fuel system

[Piggaz]

I'm running a very similar setup.

Lift pump into a 5 litre surge tank, twin 044's into standard feed and return, into fuel rails, -8 out of the middle to reg, -8 back to surge, -6 back to tank using the standard fitting.

Absolutely no issue. I have a fuel pressure gauge which reads from the FPR. All seems happy. Has been like that for almost 4 years.

[ido09s]

I went slightly different and fitted a pair of -6 lines from the two 044 pumps to the fuel rail,-6 out of the centre of the rail to the FPR, and the largest standard line as the return to the surge.

I have contemplated a fuel cooler as it does get warm, i have a spare -10 GReddy oil cooler core, but havent got around to it.

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Cheers for the replies guys, what are you using for lift pumps? The walbro 400 is gonna be massive overkill for just feeding the surge tank, should I go to a 255 or 040?

[Piggaz]

I've used a Nismo and currently an 044. Both did the same job.

I suppose, as long as you have an overflow from the surge tank back into the main tank, you can't (within reason) bugger that up.

[KiwiRS4T]

Is it a track only car or for street use as well? I have a Walbro lift pump and one 044 from the surge tank but its as loud as and I wouldn't want two of them. If I were doing it again (and if I were you) I would use one (or two) of the more modern pumps such as the latest Walbro Or DW pumps.

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Street mostly, did anyone take the jet pump off or are they not causing to much restrictions

[scotty nm35]

I would have thought you could make that power with what you have. The 460L e85 pumps flow 450ish kw at 13.8v, much more if you bump the voltage up. The stock lines would have done the job realistically.

If you need a surge tank for the track that's a different story, just make sure there is no raw alloy in the system, it does eventually corrode.

6an return should be fine.

044's are noisy old designs. There are much better, modern pumps up to the task for external duties when the Walbro can't keep up. Something with PWM ecu speed control built in is probably your best bet.

[Piggaz]

044's are noisy old designs.

They really are not that bad if you rubber mount them. But yes, there are quieter pumps out there.