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Check that is battery voltage at the pump relay, with the ignition on the relay should click in and there should be battery voltage at the cable going to the fuel pump , If all is correct there check for a broken cable to the fuel pump
Not getting gas TO the fuel pump ? Yes there is a ASD - auto shut down relay ,but has nothing to do with fuel pump power . Check the fuel pump relay . Videos on you tube testing fuel pump electrical circuit . Fuel Pump Electrical Circuits Description and Operation
If the pump is good, check the fuel filter and the fuel pressure regulator. Also, if the truck has a factory installed theft deterrent system, it shuts off the fuel supply to the vehicle when it isn't working properly.
common problem with chev trucks. the square 4 wire plug on the top of the fuel pump is known to go bad. Often shorting the fuel pump. replace the pump with the new pigtail they provide in a good quality fuel pump.
CHECK FUEL PUMP PRESSURE. SHOULD BE 41 - 47 PSI. IF FUEL PRESSURE REAL LOW CHANGE FUEL FILTER.STILL LOW FUEL PUMP FAULTY. IF FUEL PUMP NOT RUNNING CHECK FUEL PUMP FUSE OR RELAY.IF ALL IS GOOD FUEL PUMP BAD. HAVE VECHICLE SCANNED WITH A SCANNER BEFORE BUYING NEW PARTS. LOOK FOR FUEL PUMP FAULT CODES AND PCM FAULT CODES.
Then either the fuel pump has failed, fuel filter is clogged, fuel pump relay is bad, or the fuel pump fuse is blown. Sit in the car in a very quite area or with someone listening at the fuel fill area with the cap removed and turn on the ignition without starting the engine. The fuel pump should come on for a few seconds and then shut down. If it does not then check the fuse and the relay. If it comes on then you know the fuse and relay are good. Replace the fuel filter. If that does not help more than likely the fuel pump is bad and needs replacing. The pump can run and still not be pumping any fuel. A fuel pressure test will verify if the pump is for sure bad. You have an 11 year old vehicle so it would not be uncommon for the pump to go bad especially if the filter has been neglected. A partially clogged fuel filter will destroy an otherwise good fuel pump. You will have to remove the fuel tank in order to replace the fuel pump. Use a hand pump to remove as much fuel as possible from the tank as gasoline weighs around 8 lbs per gallon. The less weight the better. Good luck and Merry Christmas.
There good be a good chance that the fuel filter may be dirty and at worst the fuel pump may have burnt out due to the lack of fuel in the gas tank. The fuel in the tank is what keep's the fuel pump cooled and with out any fuel it's common for the pump to burn out. Good luck and replace the fuel filter and if you do not hear the fuel pump buzzing in the gas tank, chances are that the pump is gone too, but check the fuse to the fuel pump and see if it burnt out before the pump did.
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