I have a 2002 GMC Sierra 1500 8 cylinder 5.3l truck. I have had issues with it starting, the fuel pump would not function. I had been able to remove the relay and replace and it would start from time to time. Recently it would not start, no matter what I did. I replaced the fuel pump and the fuel pump will not kick on, therefore truck is still not running. Any ideas what I can check next?

Chevy Silverado and GMC Sierra Fuel Pump/Fuel System - Edmunds.com

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Mar 20, 2011 - 30 posts - ‎19 authors
Learn more about Chevrolet Silverado 1500 at the Edmunds.com Car Forums! ... problem with my 2000 GMC Sierra 1500 4.8LTR V-8 you described in your post. .... Ihave a 2008 gmc sierra last 8 vin 8Z160870 4WD pickup was ... removed power and truck died. have no power at 20amp pump fuse, key on ... Chevy Silverado and GMC Sierra Starting Problems ...
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forums.edmunds.com > Chevrolet > Chevrolet Silverado 1500

Oct 20, 2008 - 30 posts - ‎19 authors
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All things equal the 6 cylinder engine has better fuel MPG ratings.

Remove the bolts that hold the bed box to the frame, disconnect the rear light wiring harness and the fuel filler pipe. Set up a pair of saw horses or something behind the truck. Then have four guys to lift on all four corners and set the bed on the stand you have ready. The bed is heavy! And there is the fuel pump! Replace with the new and take care to put the wiring harness for the fuel pump back where it was. Replace the bed, bolts and connect the lights. You are ready to go! Takes about two hours if you don't break the welds that hold the nuts for the bed bolts loose. Good luck!

Depends on your alarm system things could leed to that and it could also be something more costly like time for an engine overhaul cylinder head gascots burn with time and the cylinders loose compression to be sure have the compression check in the cylinders compare to OE standards tthat way you'll know what your dealing with

the fuel filters are in tank and not serviceable on most newer gmc trucks until the fuel pump dies

Yes it has a rubber cover over it in the engine compartment.i would change the relay.good luck.

The fuel sending unit only controls the gas guage not the fuel supply to the vehicle. The pump is twelve volts. If you are not getting twelve volts on the PUMP wires check the fuel pump relay and the key circuit to it. If you have to cycle the key three to four times rapidly to get the vehicle to start check the fuel pump pressure at the regulator for manufacturer specs. An injector stuck open will also cause same problems you are describing.

fuel pump are known to go

You need to have the computer scanned for trouble codes before you waste any more money.Good Luck.