Possible shorted fuel pump relay. Disconnect relay to see if pump shuts off. If so, suspect relay problem. This vehicle may have 2 relays. Try the one in the underhood relay/fuse center first. Here are some pictures of relay locations. If equipped with a secondary relay, it will be #3 in the lower picture for location
SOURCE: fuel pump
Ok-You will have to Drop the Fuel Tank. The Pump is Inside the Fuel tank and is NOT an Easy job. If you decide to Proceed-Let me know!
SOURCE: where is the fuel pump fuse located on a 2001 gmc
The underhood fuse panel is marked and the fuel pump relay is there as well and they fail as the pumps fail tooand they need to be replaced if the pump does any way. The ground wire for the pump is sometomes overlooked when putting the tank back in as its on the top of the frame rail on the drivers side nearthe tank. It can be dirty too. Lesten for the pump running by having someone cycle the key with your ear against the tank it should come on and shut off a few seconds later. if its working. some can be put in wight the wires backwards and they run backwards but make no presure. Chaek for fuel pressure at the fuel rail. and many pump failures are because the filer is stopped up or theres somthing other than gas in the tank water) ( sugar ) some new pumps don't make enought pressure. Below 50 Lbs. it won't start. Adding gas or even carb spray to the air inlet may get it stasrted. The air in the system may get out then and it'll be OK. Sometimes the battery will be too low to turn the pump on but the engine will still crank
SOURCE: Where is the fuel filter on my 2008 GMC Sierra
The fuel filter is in the fuel tank.This vehicle has a returnless fuel system.There is no fuel return line.Hope this helps.Good luck.
SOURCE: 2004 gmc sierra 1500 blower motor location
The blower motor is on the passengers side under the dash.You might have to remove the a lower panel.This is the insulator panel.If the blower works at all just turn it on and follow the noise.Hope this helps.Good luck.
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