|
Author
|
Topic: help with starting problem
|
abe5.0
¯
Member # 4784
|
posted
 
 
I am having a problem starting my 1990 gt, it rotates but will not start. I can get it to start no problem with a little spray of starter fluid, but even after running it it will not start again w/out a spray of starter fluid. I am able to drive it. I think that it is not priming after i shut it off b/c i hear a big hiss and at least 5 sec of flowing liquid (pretty sure it is fuel). I think know what a car should sound like if it is priming. So my question is, What are the possible reasons the engine isn't priming itself?
--------------------
abraham
Posts: 74 | From: fairfield CA | Registered: Aug 2004
| :
|
|
BlackNGold
CaliforniaFords.com
Moderator
Member # 655
|
posted
Just a guess, but the first thing I would check is your fuel pressure regulator, sounds like it's not holding pressure very well...The best thing to do is buy a fuel pressure gauge and see how much fuel pressure you actually have when you just turn the key on...
Good luck... ![[patriot]](graemlins/patriot.gif)
--------------------
-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
| :
|
|
KRZ89GT
¯
Member # 4273
|
posted
check for pressure at the shrader valve on the fuel rail near the #1 cylinder. also check if you hear the pump going on.
--------------------
89' bLACk GT (stolen)
KRAZYFORDS
Posts: 353 | From: MICHOACAN | Registered: Mar 2004
| :
|
|
six 5.0
¯
Member # 3153
|
posted
My old 90 had a simalr problem. Ended up being my computer, check it out.
--------------------
IwishIwasan03COBRA!
Posts: 4425 | From: SAN MATEO | Registered: Aug 2003
| :
|
|
abe5.0
¯
Member # 4784
|
posted
checked it with a fuel pressure guage, but just to make sure: the pressure is supposed to shoot up to about 35-40psi and if i do not turn it over, slowly drop? I made sure to disconnect the vaccume hose from the fuel pressure regulator, in order to make sure that i am only testing the pump. I am assuming that the pressure slowly drops becuase the regulator isn't connected to the vaccume hose. By the way the reading i got was 39psi meaning that my pump is good, right.
--------------------
abraham
Posts: 74 | From: fairfield CA | Registered: Aug 2004
| :
|
|
S351-R
CAFords OG
Member # 1605
|
posted
quote:
Originally posted by abe5.0:
checked it with a fuel pressure guage, but just to make sure: the pressure is supposed to shoot up to about 35-40psi and if i do not turn it over, slowly drop?
What did it slowly drop to? After engine shut off, fuel pressure is still maintained in the fuel lines by an anti-drainback valve in the fuel pump. Attatch the fuel gauge, start and let the engine run, shut it off and check to see how much of a pressure drop there is. It shouldn't drop to zero as this will cause extra fuel pump priming in order for the fuel pressure to build up for the next start-up cycle. As far as what fuel pressure should be: KOEO (KOER w/vacuum hose disconnected) 35-45 PSI. KOER (w/vacuum hose connected) 30-40 PSI. If fuel pressure is not maintained after engine shut off, then you have a bad fuel pump. A sticking open or damaged diaphragm in the fuel pressure regulator will also cause a loss of pressure after engine shut off. However, your reading of 39 psi would not be possible with a damaged regulator so you could probably rule that out.
Posts: 344 | From: Earth | Registered: Jul 2002
| :
|
|
Blind
2.3L
CAFords OG
Member # 3052
|
posted
my car holds its fuel pressure for about 2 hours before slowing dropping if the engine is not running.
--------------------
89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
| :
|
|
abe5.0
¯
Member # 4784
|
posted
so the pressure dropped w/regualtor connected to 0psi, does that mean i have to replace the fuel pump?
--------------------
abraham
Posts: 74 | From: fairfield CA | Registered: Aug 2004
| :
|
|
KRZ89GT
¯
Member # 4273
|
posted
is your fuel pump whining when you turn your key to the on position if so signs of a bad pump.
--------------------
89' bLACk GT (stolen)
KRAZYFORDS
Posts: 353 | From: MICHOACAN | Registered: Mar 2004
| :
|
|
Email this post to someone!
Printer friendly view of this Ford topic
