eg:R

ive replace my walbro 255lph with a treperformance 340lph and my fuel pressure drop 6psi on my gauge to the rail. is it suppose to do this?? i thought the pressure should go up knowing its a higher pressure pump. anyone have a ideal if this is correct.

area522010

3 things to check

1. check the fuel relay known to go bad.

2. where your fuel pressure regulator set at?. the higher the pressure the more the pumps loses pressure

3. the ground on the pump

eg:R

I had my pressure at 80 on the 255... Can that be the problem? While installing the 340 the pressure drop to 76.. Is setting the pressure too high Causing it to drop? But when I install the old pump back the pressure jump back to 80psi. I don't think it's a ground or relay problem... Seem more like this pump is not a 340lph

eg:R

Anyone try a 340lph and notice this??

da_dude

Why are you running that high of a pressure?

Garage 808 Hatch

What regulator?

eg:R

I'm running e85 and was trying to squeeze as much as I can due to running out of injector(1000cc). What is a good Or safe base pressure? I'm running a aem fuel regulator.

area522010

why are you running 80psi on e85?

most of the new 340 pumps out now dont pump out 340lph. the only pump i know that pumps a true 300lph is the new dw300(no boasting) i got one when they first came out, it still had testing fuel still in the pump when i got it. and at 52psi it still pumps a true 300lph.

eg:R

I bump up the psi due to running out of injector.

Garage 808 Hatch

Its possible that with the additional volume of fuel the AEM regulator cant keep the pressure up.

And last test I saw the Aeromotive 340 pumped out a lot of fuel. All intanks though start to dramatically drop flow as you crank the pressure up.

darkvader0

It sounds like you need an inline pump rather than a higher flowing intank.

eg:R

What is a good base pressure so I can used the pump to it full potential ?

area522010

why?

correct we had the same problem with one of our cars as soon we changed a few thing including the regulator smooth sailing.

why? guys for many years been running intakes before it became the "it" part that everybody need. sounds like you need to read more into h-t archives before you post

between 45-60psi contact your tuner he will tell you where you should be

rev-speed

so if he drop s pressure from 80 psi to 45-60 he can make 600whp?
becasue at 80psi he s so max out it just says 100% duty makeing 570whp

area522010

im making 623whp @50psi fuel presure @85% duty cycle on 1000cc precisions.

and my buddy is making 581whp @45 psi fuel pressure 70% duty cycle same injectors. you cant ask a intake pump to pump 80psi and expect it to pump 340lhp

darkvader0

With E85? Sounds like you forgot what we are dealing with in this case.

Over the years we have found that the small intank pumps do NOT provide the necessary flow at the higher pressures NEEDED to make >500hp with E85 and 1000cc injectors.

eg:R I still recommend you look into the inline pumps if you are having issues maintaining fuel pressure. It is the "it" part that many before have researched/tested/proven and found to be a great solution.

area522010

Yea you right sorry for the last comment. I have more experience with pump and c16

eg:R

K. Found out pump was bad during tune.

rev-speed

so u and ur buddys car is on c16?