Posted by Mike in Mn. on August 26, 2014 at 15:12:05 from (74.37.53.178):
Posted a while back. 03 GMC K3500 cab and chassis. 8.1 gas engine not using fuel from rear tank. finally getting some time to check this out, from your suggestions and reading the book here's what I know so far, I have no power to the rear pump, engine running and front tank half full. Finally Found the secondary fuel pump relay under the fuse box under the hood, the fuse that works with the relay is the power train control module fuse and it's good. By the wiring diagram looks like both the primary and secondary fuel senders send a signal to the power train control module and it sends signals on to both the relays for both fuel pumps. Does any one know where the power train control module is located?? I think that is where the problem is, any suggestions welcome, thanks. By the way this truck only has 6000 miles and has never been in the snow, so no corrosion any where.
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