Fuel pump ALDL jump
Thread Starter
6th Gear
Joined: Aug 2017
Posts: 6
Likes: 0
Fuel pump ALDL jump
I have a '92 C4 that's been pretty much sitting for the last 2 years. I had had some power window issues and I hadn't driven it out on the road. The last time it had been out on the road for any length of time was about 2 years ago when I filled it up with High Test fuel at Shell and brought it home to park it. Additionally, I put Sta Bil in it. It sat in a garage and every 3 or 4 months I'd start it up and let it idle for 10 minutes or so. A couple days ago I went out to start it and it popped right off. After awhile, it started to miss a little before it died completely. I started it up, but it wanted to die right away. I'm thinking that the fuel's went bad and I want to drain the tank and put in new gas. I've looked through the site and seen various methods of doing this, but draining it out through the schrader valve appears to be the easiest. Here's my question, will a jumper wire with alligator clips from Pin G of the ALDL to the hot terminal on the battery start the fuel pump and drain out the tank without any sort of damage? Any response would be greatly appreciated. Thanks!
Le Mans Master
Joined: Aug 2017
Posts: 6,942
Likes: 1,490
From: New Jersey
It's just a wire in parallel to the normal fuel pump circuit. It shouldn't cause a problem as it's fused the same as the rest of the circuit. My 84 may however be a little different. It shouldn't cause a problem.
Team Owner
Joined: Jul 2004
Posts: 28,473
Likes: 3,291
From: Hartford WI
I suppose it could add wear to the pump if you want to look at it that way. That said, what do you think is happening when the motor runs? It powers the pump and adds wear and tear to it. So, in the grand scheme of things, is a drained tank going to change much? I doubt it.
Burning Brakes
Joined: Jan 2015
Posts: 875
Likes: 76
Team Owner
Joined: Jul 2004
Posts: 28,473
Likes: 3,291
From: Hartford WI
I would think that if you replace it with an adjustable unit, you have to set it. For the stock unit, I don't see any way to set it.
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Burning Brakes
Joined: Jan 2015
Posts: 875
Likes: 76
I put an adjustable top on mine many years ago as it was at 34psi at idle, and I don't remember where I set it to. But recently I checked and it idles at 38psi. I did mark the screw with a marker so I could screw it down back to where it was as I had a random fuel leak and I think it was coming out the pressure regulator's base. So pulled it to clean everything and tighten it back down and noticed some small cracks in the rubber that got worse as I handled it and so went ahead and ordered a new fuel pressure regulator.