1985 VATS Problem
Racer
Joined: Jan 2017
Posts: 486
Likes: 7
From: Monroe Twp. S-NJ
Thread Starter
Cruising
Joined: Jan 2017
Posts: 13
Likes: 0
Just put 12V jumper to G in the ALDL and the pump should run, take the 12V directly from the battery if you like. Do NOTHING with any other terminal - 12V to G in the ALDL. How fast does this car crank? Labors to crank off battery OR at full charge cranks as expected?
***You mention starts - runs a few seconds and dies. Maybe ignition module failing and no distributor reference so ECM isn't energizing the fuel pump relay.
***You mention starts - runs a few seconds and dies. Maybe ignition module failing and no distributor reference so ECM isn't energizing the fuel pump relay.
Oil Producer
Joined: Apr 2014
Posts: 9,349
Likes: 2,726
i think you can put 12v to the fuel pump directly at the back to see if it is the problem
if it doesnt start operating with direct power then its toast?
Thread Starter
Cruising
Joined: Jan 2017
Posts: 13
Likes: 0
Ive done this with a battery charger and as I stated before it starts but will not stay running. Although I have not tried this while jumping the oil pressure switch. Should I try that?
Burning Brakes
Joined: Nov 2016
Posts: 761
Likes: 79
From: Buchanan GA
No, you do not need to jump out the oil pressure switch.
Thread Starter
Cruising
Joined: Jan 2017
Posts: 13
Likes: 0
The fuel pump only runs if i hot wire it. It continues to run but the car does not. It will start and run for a few seconds then shut off but you can hear the fuel pump still running.
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Burning Brakes
Joined: Nov 2016
Posts: 761
Likes: 79
From: Buchanan GA
Have you tested your fuel pressure yet? Yes, the pump is running but are you getting proper fuel pressure. To me it sounds like the cold start injector is putting fuel into the plenum to get the car started but it starves for fuel after that.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,214
From: Park City Utah
Cliff is right, ON 8th is wrong.I agree with the others who have suggested putting a fuel pressure gauge on it.
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Last edited by Tom400CFI; Feb 8, 2017 at 11:35 AM.
Thread Starter
Cruising
Joined: Jan 2017
Posts: 13
Likes: 0
I checked it before I had the starting problem and I was getting 40 psi. I have not checked it since I had to hot wire the fuel pump. I will try that. If it drops pressure after the start does that mean the fuel pump is bad?