Which fuel pump...

[jonnygsx]

I currently have a small 16g and am beginning my fuel mods. My goal is to run 12's with my 98 GSX. I want to be able to run pump gas. My plan was to use 660cc injectors and an apexi afc2. My question is in regards to what fuel pump I need. I was thinking a 255lph walbro, but I want to be able to use my stock fpr. Can I use a 255 with the stock fpr? Should I go with a high pressure or low pressure pump?

Thanks, Jon

 

[bobgeorge]

the 255 will over power the stock fpr. if you are going to get a afc then you should get a adjustable fpr

 

[jonnygsx]

Well, do you think that a 255lph is overkill for my setup? Would a 190lph work? I really don't wanna spend the cash for an adjustable FPR unless I must. I have heard of people using 255's with a stock fpr but I don't know how well it works....

 

[larryd]

Some people say you will be fine with the low pressure 255. The high pressure on the other hand requires an AFPR.

 

[KRAZYKOREAN]

Originally posted by larryd
Some people say you will be fine with the low pressure 255. The high pressure on the other hand requires an AFPR.

I have the 255 high pressure..and mine is totally fine whitout the AFPR...

 

[larryd]

How do you know that, do you have a gauge on your car that tells you your rising at a 1:1 ratio?

 

[KRAZYKOREAN]

Nope....you got me there....whats the effect of the high pressure to the Low pressure..

 

[Guerillah]

I thought the high pressure just doesnt fall off at high boost (fuel pressure) like the normal 255 would...

 

[larryd]

the high pressure will overrun your fuel regulator. What happens essentially is when your boosting and your fuel is supposed to rise at a 1:1 ratio the FPR cant do its job and you get to much fuel and the car doesnt run as well as it should.

 

[KRAZYKOREAN]

Originally posted by larryd
the high pressure will overrun your fuel regulator. What happens essentially is when your boosting and your fuel is supposed to rise at a 1:1 ratio the FPR cant do its job and you get to much fuel and the car doesnt run as well as it should.

Damn really..well thats a reason for me to get a nice AFPR and new lines..