Fuel Pump Ground To Frame / Harness Location - S-10 Forum
 
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post #1 of 7 Old 06-22-2011, 02:09 PM Thread Starter
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Fuel Pump Ground To Frame / Harness Location

Ok brain trust: Where is the ground location to the frame / harness for the fuel pump on 2002 Blazer 4x4 4 Door?

Searched and nothing specific except to check it.

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post #2 of 7 Old 06-30-2011, 12:42 AM
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Re: Fuel Pump Ground To Frame / Harness Location

Don't know if this might help, but I did find a thread that mentioned (splice pack) sp423 -- a bunch of grounds packed together on the rear crossmember just behind the fuel tank (and damned difficult to get to). Apparently, corrosion of this pack can even cause engine misfire codes.

here's one link to the issue:
http://blazerforum.com/forum/2nd-gen...k-243-a-48712/

I had some links with photos of the grounds but can't seem to locate them.
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post #3 of 7 Old 07-01-2011, 10:22 AM
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Re: Fuel Pump Ground To Frame / Harness Location

OK. Here's part of the thread dealing with splice pack 423. You're probably not going to like it. There are some links to a few photos the contributor took of the pack along the rear crossmember, behind the fuel tank.

Struck me as an important thread to follow, as the guy was having problems with random misfires (p0300) and it took him an eternity to trace it back to this issue of corroded sp423 grounds. Not usually the first place you'ld look (or even want to look, I wager).
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post #4 of 7 Old 07-01-2011, 11:49 AM Thread Starter
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Re: Fuel Pump Ground To Frame / Harness Location

Thanks for the links, I did find it. Fairly easy to get to with the tank ans spare tire out. I ended up doing a fule pump on the one i started the thread on. I have another one to do that after being towed the gas guage is either pegged out full or dont work at all. I am suspecting a pulled wire in the tail light area. This one if i have to drop the tank and spare I will try to get some pictures and post them.
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post #5 of 7 Old 07-14-2011, 11:49 PM
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Re: Fuel Pump Ground To Frame / Harness Location

so thi s is above the tank?

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post #6 of 7 Old 07-15-2011, 11:52 AM Thread Starter
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Re: Fuel Pump Ground To Frame / Harness Location

sorry, I didnt finish the thread after discovery...

The rear body ground cluster is on the top of crossbrace right behing the tank. On mine there was a splash sheild somewhat in the way. Easy way to find it is follow the ground braided strap from the fuel filler neck to the mount point. Pain to get at but if you use a racheting wrench it is ok.

I ended up replacing the pump as it tested bad one pulled, however i think it is a good thing to at least check that ground. If i were doing a pump replacement in a production type enviroment i would at least looses that ground bolt and tighten it ot prompte good contact.
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post #7 of 7 Old 11-10-2011, 07:38 AM
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Re: Fuel Pump Ground To Frame / Harness Location

sweet. this what i'll check next. Same / similar issue w/ the misfire, non running. replaced pump and runs w/a ground "jump wire" but didn't know where the grounding issue would be. Thanks. I'll post again if it is the 423 pack.
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