Upgraded Fuel Pump

Gungrave

Thanks for the responses guys. I’ll probably end up going with either the DW200 or the Aeromotive.

Though I do have another question. Can someone explain how the fuel pump actually works? I have a basic understanding but when looking at some of the aftermarket performance ones, I’m starting to get confused. So I found this article on them which did help but brought other questions.

https://www.realstreetperformance.co...t-performance/

Now after reading this article, it seems like they aftermarket ones push out more fuel than the stock ones, or at least has the capability to. And as the pressure increases the amount of fuel decreases.

So my question is this. Do the aftermarket ones push that much more fuel than stock or are simply able to? As in if you stay off the gas then it won’t push that much but if you floor it then it would? Since the aftermarket fuel pumps push more fuel, would that actually decrease your mileage in the car? And would there be any adverse effects to let’s say a completely stock Z if a DW200 or the Walbro 255 was installed on it?


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phunk

The factory fuel pressure regulator in your 370z attempts to maintain 52psi in the fuel system at all times.

Using random numbers for example;

If your fuel pump flows 200lph at 52psi, but your engine is consuming 25lph to maintain the speed you are traveling, then your regulator will have to relieve 175lph from the system to maintain 52psi.

If you upgrade to a pump that flows 300lph at 52psi, while your engine is consuming 25lph, the regulator will then have to relieve 275lph from the fuel system.

If you increase the engines fuel consumption to 100lph, the regulator will start to relieve 200lph from the fuel system to maintain 52psi.

So to answer your question: larger pumps can and do push more fuel than stock. But it does not effect your fuel economy because all the extra fuel just gets dumped out by the regulator.

NOTE: when you go large enough on the pump, the regulator and passages in the fuel pump housing will require modification to increase their flow potential so that the regulator is able to do its job. High flowing pumps will overwhelm the regulator and it will struggle to maintain correct pressure. At this point, it WILL effect your fuel economy and the engine can run too rich from fuel pressure exceeding specification.

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SonicVQ

Quick question: If you increase the pump volume and retain the stock fuel pressure, won't that just heat up the fuel faster, since more volume is being pumped over and over, verses being burned in the engine?

phunk

It’s not really a factor of fuel pressure. But yes, you are just cycling fuel through the fuel system more if you pump more without consuming it. There is typically nothing to gain by upgrading the fuel pump when you don’t need to.

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Sharad909

Hey guys, so I experienced my extreme fuel starvation an hour ago. Did a right sweeper and car died on me, tried to start it and nothing. Then jumped into the forum while I let the car relax on the side of the road, and saw Phunks comment on filling a gallon of gas to get the system running. It worked wonders (Thank you Phunk!). So what should my next step be? Replace for a OEM pump? I was at half tank when this happened. And had some starvation from tiny hard right turns too (3/4 tank).

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12 370Z- Touring- Sport- 6MT-
Z1 Anti Starv, 34R Setrab Kit, 20/25MM | Konig 18x10.5 W/ Hankook RS4 | PowerStop TrackSpec Pads | TTP Single Exit , & Swift Springs | Previously Owned: 18 Q50- 480RWHP- 12.2 @118- Sold, 92 240SX Built SR

Rusty

To cure the problem all together. You need phunk's (CJM) RRP kit. It's not cheap.

phunk's road race fuel pump install

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madwi

Oem pump is fine, its that the gas gets sloshed to the left side of the tank and then the pump isnt picking up fuel so it starves the motor. The goal is to get fuel to the pump while doing right hand sweepers. Phunks RRP and the Holley hydro mat seem to be the two most used choices.

phunk

If you are experiencing slosh starvation on the street with fuel levels 1/2 to 3/4 full... unless you are driving like a complete maniac (no shame, been there) it’s possible that your top hat is broken and the pump basket itself is sloshing around making the issue worse. I suspect this might be the case.. because making my 370 fuel starve on the street with over a half tank would require a right hand 270 degree on-ramp at the absolute limit of grip.

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