fuel pressure zero right after turning ignition off
Thread Starter
Junior Member
Joined: Apr 2012
Posts: 23
Likes: 0
From: Tennessee
Car: 1989 IROC-Z
Engine: 305 TPI
Transmission: 700R4
fuel pressure zero right after turning ignition off
I have a 89 IROC-Z with a 350 TPI. When I turn on the key, you can hear the fuel pump running, then turns off. It has pressure then. After I turn the key off and check the pressure I show no pressure at all. My question is: Is this correct or should it hold pressure? Thank You and God Bless US All...John 
Thread Starter
Junior Member
Joined: Apr 2012
Posts: 23
Likes: 0
From: Tennessee
Car: 1989 IROC-Z
Engine: 305 TPI
Transmission: 700R4
Re: fuel pressure zero right after turning ignition off
If it should hold pressure. What would be the fix? New fuel pressure regulator? The fuel pump was changed about 9 months ago. Thank You all in advance and God Bless US All....John
Moderator
Joined: Jan 2000
Posts: 20,981
Likes: 11
From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: fuel pressure zero right after turning ignition off
Could be leaking FPR, leaking injectors, leaking pump check valve, or an external leak.
Thread Starter
Junior Member
Joined: Apr 2012
Posts: 23
Likes: 0
From: Tennessee
Car: 1989 IROC-Z
Engine: 305 TPI
Transmission: 700R4
Re: fuel pressure zero right after turning ignition off
Well it looks like I have a bunch of troubleshooting to do.. Just where to start first. I don't believe there is an external leak in the system. Underside of car is dry everywhere. Fuel pressure regulator first or injectors? How would you check the Fuel injectors? Thank You and God Bless US All....John
Joined: Oct 2001
Posts: 12,213
Likes: 1,140
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: fuel pressure zero right after turning ignition off
It should holp psi but if the car gets full fuel psi and starts right up, you really don't have a problem.. Mines been that way 4 20 years.
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