fuel pressure.. hmm?

[Stang67401]

hey ive came pretty close to spotting the problem on the stang, and im thinkin it has somethin to do with fuel pressure. i have lost a lot of power and my start is is terrible. however, when i cylce the key many of times before turning the car over it starts up GREAT. ive tried replacing the fuel pump/filter and still have little power/not good startup. the pump itself only costed like 100$ so im wondering if i just need a more performanced based pump. please give any input i need it!!! thanks

 

[Addermk2]

get a gauge on the rail and see if your pressure is low.

sometimes a faulty FPR or a hole in the fuel feed "S" hose from the pump to the sending unit, can be blamed for such problems

 

[blue9550gt]

does ur car act like a vapor lock problem mine is doin bout the same thing only when hot outside

 

[Stang67401]

what do you mean by vapor lock problem? and yea i got an adjustable fuel pressure regulator and im reading around 39 which i believe is just right.

 

[dczsvt]

what do you mean by vapor lock problem? and yea i got an adjustable fuel pressure regulator and im reading around 39 which i believe is just right.

I believe its supposed to be 45-55psi, im lookin in the book here and cant seem to find it, but I know mine doesnt fall below 50psi even on a load

 

[dczsvt]

nope, its 30-45psi

 

[Paul]

Vapor lock doesn't happen on EFI cars.

 

[Tbuck07]

The fuel pressure OFF vacuum on the regulator is 38-42 psi... 55 is too high

 

[dczsvt]

The fuel pressure OFF vacuum on the regulator is 38-42 psi... 55 is too high

im just sayin what the book says
vacuum hose attached=30-45psi
vacuum hose detached=40-50

 

[Paul]

39 psi with the vacuum disconnected.

 

[wannaboost94gt]

39 psi with the vacuum disconnected.

+1 :thumbsup:

 

[Tbuck07]

39 psi with the vacuum disconnected.

+1 :thumbsup:

Couldnt give me a thumbs up and a +1? Ass. . Gonna go cry in the corner now.

 

[Paul]

Don't worry Tbuck, it's cuz I'm so handsome.

 

[wannaboost94gt]

39 psi with the vacuum disconnected.

+1 :thumbsup:

Couldnt give me a thumbs up and a +1? a*s. . Gonna go cry in the corner now.

+1 :thumbsup: Feel better now ccasion14: now get out of the corner and quit bein emo :crybaby2:

 

[Stang67401]

ive tried running pressure at 35, 39, and 42. and still little if any difference. i had a friend start the car up for me while i watched my fpr guage. he started it up and it kinda hesitated (the guage and the car) and then a quick sec later then starts to ideal just fine. im now startin to lean over to a vacuum leak problem? would that cause such a thing?

 

[Stang67401]

idle*

 

[Addermk2]

set it to 39 and leave it the F alone

 

[rz5.0]

mine is at 44 anything less and i get back fire and check engine light on. vacuum off

 

[Addermk2]

mine is at 44 anything less and i get back fire and check engine light on. vacuum off

maybe you should get a tune

 

[rz5.0]

i need one hopefully i can get it here in two weeks it runs fine at 44 as long as i let it sit at idle for like a min in the morning then it runs just fine.