Which fuel pump? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-27-2013, 11:16 AM   #11
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Well, this job is turning out to be about the worst job I have ever needed to do. Everything is very rusted, or stuck, or broke, except for the locking ring on the tank. It came off easily.

Evidence that I have found while working on this shows that this has been done before, The was a Delphi pump in the tank, and a NAPA labeled tank filler hose. However, like a lot of the work done on the car before I got it, the quality of the workmanship left much to be desired. I think I found what the problem was. The seal on the output side of the pump was not properly seated, and the cap that clips over it was clipped on one side only. The seal also had a tear in it. So, it may have been leaking, and not providing proper pressure to the engine (I had 28 PSI).

Well the tank is out, the new pump installed in the hanger. I had to cut off the old straps because the bolts that held them just spun and would not loosen. It took almost the whole day to get it out. While removing the lines, the output to the filter came off OK, the return line broke (rusted though) and the third line'* disconnect would not come apart. So, I cut the third line, and I will patch the two lines with some hose. (Just need a very short repair.)

Now to get the two strap bolts out, (I'm replacing with standard nut / bolt hardware) put the pump in the tank, and get the tank back into the car.
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Old 10-27-2013, 11:58 AM   #12
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I thought I said something about those darn straps and mounting hardware. LOL.

Yea, good luck cutting those bolts out. I had to use my air cut off tool to get them out. Or, if your handy with an Oxy-Acet torch.
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Old 10-27-2013, 12:25 PM   #13
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Quote:

Yea, good luck cutting those bolts out.

Unquote

I really didn't need to read that .....

I have neither a cut-off tool nor an oxy torch. I guess I'll have to muddle through as best I can.

I've done fuel pumps on other manufacturer'* cars, this is my first GM. I have always gotten done in a day with no major hassles. Ah, the joys of GM.
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Old 10-27-2013, 01:26 PM   #14
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I see that one strap is a little longer than the other. Since my original straps we destroyed during removal, can anyone tell me which strap goes on which side?
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Old 10-27-2013, 03:11 PM   #15
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Good question. I don't remember myself. At least you have a 50-50 chance of getting it right. What are you using to hold the tank up?
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Old 10-27-2013, 03:34 PM   #16
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I have the tank out, and the new pump, strainer, "O" ring and lock installed in the tank. I used a floor jack with a board on it to hold the tank, then lower it and remove it from under the car.

I have the old bolts out now, thanks to a hacksaw and small prybar. The replacement bolts I bought (before I removed the old ones) are a size too small. I will need to run to the hardware store and exchange them.
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Old 10-27-2013, 03:44 PM   #17
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I hate it when that happens. You buy something, get all the way home and find out its not the right size.
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Old 10-27-2013, 08:23 PM   #18
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Ran out of time today, and it'* too dark to do anymore. I am at the point where I need to put the tank back up into the car and connect everything.
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Old 10-29-2013, 07:14 AM   #19
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Go to a good Auto Parts supplier and tell them what you're working on. My local Auto Parts store hooked me up with some long bolts and "clip nuts".
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Old 10-30-2013, 03:35 PM   #20
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Update:
IT RUNS!

47 PSI fuel pressure (Close enough for me, much better than the 28 PSI I had)
HOWEVER:

The return line leaks like a sieve at the quick disconnect. So, after a short break, I'll be doing something about that.

Some things I learned / did:

IIRC, the long strap went on the driver'* side
Get every drop of gas out of the tank as possible. If the old pump works st all, use it to pump whatever gas it can into an approved container. You can disconnect the fuel filter and use that line into the container.

One thing that i did do differently that I hadn't heard of being done before:

With the new nuts and bolts to hold the straps, instead of running the bolt through the strap and into a nut inside the bracket on the car, I did the opposite and hung the bolt through the bracket, through the strap, and a nut on the bottom. Much easier. The bolt configuration that i used was this:

3/8 inch diameter bolt (fully threaded) 2" long, with a lockwasher next to the head of the bolt, followed by a flat washer. Bolt through the top of the bracket, strap onto the bolt, another flat washer, then a nut with a built-in star-washer. Anti-seize compound on the bolts, just in case I need to disassemble in the future.
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