[5litercobra]

hi not quite sure but when i turn my key on the pump does stop after the three sec like its supposed to the service tech at ford tells me it may not be building pressure so that would mean the regulator is bad right or am i wrong is there some other thing in the fuel system that restricks fuel flow to build pressure

[stang fanatic]

hehehe....dont feel alone! The pressure regulator is what sets fuel pressure as long as theres not a leak before the inlet....remove the vacuum line on the regulator and see if it has fuel in it...if so, it's leaking. have heard some systems were set up up to stop pumping after so long to with key on/engine off only to prevent pump burn-up.

[GTXRacing]

I do have one question though. My car is a EFI to carb conversion and the Relay is still intact, It's not broken I don't think but why is it the darn relay won't shut off the pump when I turn on the key?

[Mustang8719]

Originally Posted by GTXRacing I do have one question though. My car is a EFI to carb conversion and the Relay is still intact, It's not broken I don't think but why is it the darn relay won't shut off the pump when I turn on the key?

If you removed the computer then nothing is telling it to turn off.

[stang fanatic]

or somebody re-wired it to run strictly off of a key on wire...

[GTXRacing]

The relay should tell it to turn off correct? If so, I just said it's not broken. Also, I don't think the computer is still in tact because it's right behind my radio where he left it and it still clicks and runs swell when i turn over the key. It just won't turn off LOL.

Could it be when the bowls fill up enough that the pressure is reached, then the relay see's pressure at max so it shuts off?

[stang fanatic]

what year mustang???? the key activates the relay...if, which it probaly doesnt, has a fuel pressure sensor, then the ecm will break circuit on the fuel pump relay shutting off the pump until pressure falls below program spec and then will re-activate the relay. I have an 87 sdi and utilizes no f/p sensor so my pump runs constantly with the key on.

[GTXRacing]

Oh I'm sorry. I have a 1988 Ford Mustang GT EFI to Carb Conversion. Currently wired to the relay but seems to not shut off. What wire can I currently run into to make it run with JUST THE CAR ALL THE WAY ON, not just the key. Better yet I'll probably wire the power to my own switch so I can shut it on after I crank the car but don't carbs need constant pressure to run consistanly?

[stang fanatic]

yeah...88 have no pressure sensor so theres nothing to tell the pump to stop. as for your efi to carb..all they did was put an inline regulator and so i dont recomend wanting to shut it off unless you want the feature for when your sitting somewhere without the car running...if you went back with a manual (engine) pump...then you could just put an early model sender unit in your tank so you can eliminate the electrics completely

[99mustang232]

article about relays

[GTXRacing]

Well honestly I like electronics but this particular problem is not coming around correctly LOL. But I do like my electric pump, plus I have a spare so if it F's up, I can take off the two wires and the in/out hoses and vice versa without having to take the whole dag um tank off again and again.

Just Looked at the article, it's pretty sweet and I've saved it. So it's ok if it turns on after I turn over the key and like a second later I start it right?

[stang fanatic]

yes, it's ok nothing wrong....

[5litercobra]

k i checked the regulator its ok i was told it might be a relay but the relay according to my manual is one unit that controls the pump ,pcm, EDF what ever that is now lately it does not want to start pump is on but not even trying to start it turns over but no vroom it gets fuel so im thinkin no fire now. Q what is the EDF controled by the ccrm? Sometimes the car will run if it sits for a few hours could the pick up in the distributor be bad of so why does it start when it sits for hours or do you think the ccrm is shitty thanks guys

[stang fanatic]

Ok, if the relay is dropping out and the pump stops, (i dont believe you have a pressure sensor to tell it to stop, but could be wrong) then you wont build any pressure. you need to install a gauge and watch your pressure and see what it does. 38-40 psi key on (steady) and then will drop at most 3 psi when running. no pressure-no start. ignition module acting up for no start since theres nothing exact as to why a no start such as when hot versus cold everytime, etc. .......

[5litercobra]

ok i dont know why but when it starts sometimes it stops after about 30 sec and then it wont start again fuel pump on but no fire so you think its not gettin pressure or do you think it could be somethin else cause the fuel is there as for the psi i dont know i tried to find a psi gauge but could not. is it possible the ccrm is faulty or the pump? or the ign. module ill check tommorow for spark the next time it does it but lets say it does have spark and still does not start. Just thought i would throw that out there for previous info working towards a solution thanks guys a bunch

[stang fanatic]

what year? i have an 87, bought a $40 gauge at pep boys which auto zone sells and it fit fine. so car starts and then dies after 30 sec. with no restart? but fuel pump is still running even though it wont start? gotta know what that pressure is or else youll spend a lot of time ckin other things to no conclusion. all fi troubleshoot starts with ensuring you have pressure with no restrictions
gauge was an actron cp 7818- shows up to 86 model year but worked on mine so it should work up to 92 model year

[5litercobra]

it was also an actron at pb my car is a 95 the last of a dying breed i think i might just give in and take it in i am sooo tired of this shit and the guessing game it pissing me off. but thanks for your input man it really helps me to understand all this stuff a little more

[stang fanatic]

I hear ya 100%. got ahold of a actron super code reader, and it wont function with mine either and now im at a total loss myself. Its funny, theres lots of things we can do and yet sometimes, something, probaly like in my case, its something little thats just kickin my ass...