Upgraded Fuel Pump
 

Hopefully I started this thread in the right area.

So I recently posted on here about my Z losing power then dying on me. I search the forum and only and majority of the info I found said it would either have been caused by the MAF or the Crankshaft Position Sensor. I switched out those with no luck, so I had the Z towed to Nissan.

I'm sure they'll have it for a few days, but so far they said it may be the fuel pump which does sound possible. I've been looking online for an upgraded aftermarket fuel pump with pretty much no luck. I've mostly found Nissan OEM fuel pumps, Walboro (which I've seen threads on this forum saying its pretty much garbage), Delphi from AutoZone and fuel pumps that are part of a super charger kit. I haven't found any that are sold by itself and are better than OEM.

Do you guys have any suggestions on an upgraded fuel pump and where I can find one?

Thanks.

There are several threads on this site that discuss your different options. From what I remember reading, there's not but 2-3 good choices available.

Who says Walboro pumps are garbage?

Nothing wrong with Walboro pumps. If you are stock, go back stock (OEM).

i've been running walboro for years now

I’ve been searching through the forum and the only upgraded one I’ve seen mentioned is the Walboro.


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I’d have to go back through and find out who lol. It was a few people though. I know I’ve never heard of them till I started searching today.

Is it one of the better ones then? I have stock on it now, but the cheapest OEM I’ve found is $350. I’d rather get an upgraded aftermarket one if I’m gonna have to pay that much for it. Plus I’ll be getting the Stillen Super Charger kit eventually, though it comes with one in the kit already.


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Try going to any of the big search engines and add "site:the370z.com" to your search string. Eg, "fuel pump site:the370z.com". This will limit your search to this site and provides, IMNSHO, easier to process results.

Anyone ever use this fuel pump? And I’m assuming it wouldn’t use the stock top hat?

https://www.z1motorsports.com/fuel-s...t-p-13566.html


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Or have any if you used one of these?

https://conceptzperformance.com/aem-...al_p_17401.php

https://conceptzperformance.com/bosc...al_p_14348.php

https://conceptzperformance.com/deat...01_p_32368.php


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You need to get a hold of phunk at CJM. He's the fuel system SME! :tup:

https://cj-motorsports.com/

I wouldn't waste time on a walbro 255 when you can spend a few bucks more and get a Walbro 450 or something similar. It's overkill for N/A, but you'll never worry about not having enough pump.

The 255 is way overkill for NA (I'm running one boosted)... 450 would require invasive modifications to the stock pump basket and may even require adding a return system system if the OEM regulator can't be drilled enough to handle it, or the OEM filter has to be cut away to accommodate the pump itself. Too much overkill ;)

OP - it could be a broken basket tophat and not the pump itself. CJM sells an aluminum replacement tophat - the dealership will want you to buy a whole new pump basket assembly - which also carries the risk of breaking again in the future.

If the dealer replaces it they'll simply change out the entire module with an OE.

The potential exists there's an issue with the fuel pressure regulator built into the module as there was with mine. I replaced the pump motor within the module only to continue having problems until I replaced the entire assembly.

Have anyone tried the DW400? From research it out flows the Walbro 450's. It's longer in length but isn't bulky at the bottom.

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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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.

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?

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.

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).

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

http://www.the370z.com/track-autocro...p-install.html

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.

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.