Walbro fuel pump DIY

[Ainokea_Si]

ok thanks to you

[psycho1]

Originally Posted by Supa Ninja

Tony don't listen to those guys saying it will be fine, it won't be fine. That Walbro is intended for a fuel system with a return line, in which case it won't raise the pressure. We don't have one so its going to raise our fuel pressure. It can wait till you go boost.

You got to be careful when you ask questions, lots of bad info is put out here.

i knew i heard that somewhere! thanks for chiming in.

[Ainokea_Si]

yea i will just wait...trying to find some time to do everything but i have been getting killed with the family in from hawaii....family? or si? turbo? or 2 year old?


decisions i know that are hard to make...hahaha

[Ainokea_Si]

my pump sounds really loud in the car. but some else that you should mention is that the fat white piece that you remove. the locknut is a pita. i had to get my big friend with the gorilla grip to break it free!

really hard, glad to have it on now!! oh, and the turbo is installed, and tuning this tuesday

[homegrownperformance]

awesome write up! finished in approx 30 mins since i was crawling around my car cuz its snowing here right now lol. i guess i got lucky or something cuz everything went together without having to trim or modify anything.

[XSRCivic]

Originally Posted by Supa Ninja

Tony don't listen to those guys saying it will be fine, it won't be fine. That Walbro is intended for a fuel system with a return line, in which case it won't raise the pressure. We don't have one so its going to raise our fuel pressure. It can wait till you go boost.

You got to be careful when you ask questions, lots of bad info is put out here.

Stop it. The Walbro pump ALONE (no FPR crush,no bigger injectors) will not raise your fuel pressure.

Why? The stock FPR regulates how much pressure is being fed to the injectors regardless of what is supplying the fuel. The difference from stock pump to Walbro pump is how much it can flow.

Guess what? If you use this pump on a return style system, the aftermarket FPR regulates the pressure. End of story.

[Supa Ninja]

Not a problem, as soon as I get a chance I'll put a fuel pressure gauge on mine and post the numbers. Soxfan's tuner checked his, with crushed fpr and walbro it put out 90psi. Maybe it was the crushed fpr that raised his pressure 25-30 psi maybe it was also the walbro.

I'm still standing by my advice for Tony to wait till he installs his kit before installing his walbro.

[XSRCivic]

There's no reason for it to rise THAT much if the only thing your changing is the pump. The crushed FPR is what caused his to rise so much.

The stock FPR will keep the pressure at a predetermined pressure. If you completely remove the FPR and run it straight off the pump then it WILL run way too rich. I only know this because I forgot to reinstall my stock FPR on my last civic, car ran like ass, wouldn't start sometimes.

In preparation for turbo on my EM2 I setup my return line with Walbro 255 & Aeromotive FPR (set at stock pressure). I drove the car for 3 months with no turbo installed on stock motor. It ran flawlessly.

[Radicalblackcivic]

i need to do this bad

[lessthanwise]

Originally Posted by Supa Ninja

Disconnect the breather tube and the fuel line, unscrew the assembly and remove it from the tank. You will spill some fuel so don't be smoking durning this step.

lol, sage advice...

[soxfan143]

Adding the pump alone WILL raise the pressure in this car. I used the CT-E FPR tool to crush my FPR and I personally talked to CT-E and they told me that no matter what it will NOT raise the pressure more than 10psi. So the Walbro pump alone raised the pressure up the rest of the way. The stock FPR is designed to work with the stock fuel pumps fuel delivery volume. It's kind of like a garden hose nozzle. At the same setting on the nozzle, if you have terrible water pressure it will not spray as hard but with higher pressure it will spray like a bastard. Same principle here. At least that's how my tuner described it to me. If you increase the amount of fuel that the pump can deliver in a certain amount of time why wouldn't the pressure rise? This fuel system is not capable of lowering the pressure below its base setting. So it will be higher with a higher flowing pump. Basic physics here. The car will just decrease injector pulse widths to compensate for the extra fuel. Unless this car has the ability to decrease pump voltage to lower fuel pressure, but I don't think so.

[bluek20z3]

OK bottom line.....lets say you put a walbro and your mods are I/H/E OK. Will your A/F's richen up or no???????????

[Tigre]

FYI you need to change the o-ring on the top of the pump to a tighter fitting one the oem pump and the walbro next sizes arent exactly the same. you will end up with a drop in pressure on a non return style system if this were attached to a turbo car.

[Supa Ninja]

I think I mentioned it in the DIY, I used one from the old injectors. worked perfectly.

[Jesse_M]

Why does the website say that you need to convert to a RETURN-TYPE fuel system?

[soxfan143]

Originally Posted by bluek20z3

OK bottom line.....lets say you put a walbro and your mods are I/H/E OK. Will your A/F's richen up or no???????????

No it will not richen up. The ECU will adjust fuel by shortening the injector pulses to keep the proper target AFR. If you have aftermarket engine management like the EMU or F/IC you will benefit from just the Walbro. The extra fuel pressure that the Walbro will supply would only be used if you needed more fuel than the stock system could supply. And in NA form you will not need more fuel than that. If you went N2O or boost then you would benefit from the added fuel pressure. Other than that you would be wasting your money.

[bluek20z3]

Originally Posted by soxfan143

No it will not richen up. The ECU will adjust fuel by shortening the injector pulses to keep the proper target AFR. If you have aftermarket engine management like the EMU or F/IC you will benefit from just the Walbro. The extra fuel pressure that the Walbro will supply would only be used if you needed more fuel than the stock system could supply. And in NA form you will not need more fuel than that. If you went N2O or boost then you would benefit from the added fuel pressure. Other than that you would be wasting your money.

Yo soxfan do you work for a tuner shop??

[bluek20z3]

Originally Posted by Jesse_M

Why does the website say that you need to convert to a RETURN-TYPE fuel system?

By doing that you can put a Adjustable FPR ( Fuel pressure regultor) and take advantage of your upgraded fuel pump and bigger injectors....Usalluy on a boosted car like my Sr20det in my nissain my base pressure is set to 42psi and under boost it increase fuel pressure when the FPR see's boost. Usally it rise 1 lb of fuel to 1lb of air over absolate pressure, so when am in boost at 15psi i actually have 15+42=57 to 60psi of fuel pressure . Did this make sence lolol??????

[soxfan143]

Originally Posted by bluek20z3

By doing that you can put a Adjustable FPR ( Fuel pressure regultor) and take advantage of your upgraded fuel pump and bigger injectors....Usalluy on a boosted car like my Sr20det in my nissain my base pressure is set to 42psi and under boost it increase fuel pressure when the FPR see's boost. Usally it rise 1 lb of fuel to 1lb of air over absolate pressure, so when am in boost at 15psi i actually have 15+42=57 to 60psi of fuel pressure . Did this make sence lolol??????

Yes that is how it works. You can adjust the FPR to add as much fuel as you want per psi of boost. At least that's how it's supposed to work. But if you have a good EMS and don't want to make retarded power you really don't need a return system. With EMU you can adjust fuel delivery with injector pulse so raising injector size is all you really need to do when modding this motor moderately. But if you are going huge with boost and plan on using injectors that require high fuel pressure then you will need a return system to keep the fuel pressure up and to reduce pulsing in the fuel system. Pulsing is a another topic for another time.

[soxfan143]

Originally Posted by bluek20z3

Yo soxfan do you work for a tuner shop??

No, but I have been fixing cars for close to 20 years and I do it for a living. I have done all my own work on my car besides the actual tuning and I am pretty close to the guy that does the tuning and I am pretty hands on when he does it. So I've learned a huge amount about tuning from him. I just don't have a dyno or the proper data reading devices to do my own tuning properly so I have him do it. The equipment needed to do it right is quite expensive. Way more than it costs to just have him do it for a few hours. Lol.... I do help out the tuning shop I use when he's really busy and needs an extra set of hands for a day or 2.