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Re: 1998 4.3 1500 sierra gmc
Did you check the fuel pump relay? often times this get's weak with time and when it goes bad you wont get fuel. it's located in the junction box under the hood. i just take the relay from the a/c clutch to check it. this should solve it. please rate this
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If your fuel pump is continuing to run with the ignition turned off, there is something terribly wrong. I don't even know where to tell you to start without seeing the vehicle myself. If it is getting fuel and spark, the only thing left to keep it from running is compression. I would recommend having a professional take a look at it. This just doesn't sound right.
u can do the check the other way around/ disconnect the fuel line that supply the injectors/ put the pipe in a small plastic container to see if fuel is being supplied by the pump and avoid fuel spill in ur engine/ crank the engine for at least 5 seconds see if the fuel squirts with pressure/ if it does then ur fuel pump is ok / blockage is somewhere down the fuel line/ u can check fuel lines by blowing it with air but u gonna need the help of an air compressor.....
check fuel pump relay outside under hood there is also a pump jumper on driver side single red wire with plug on end where harness comes out of firewall hook up to bypass and see if pump is working also check to see if you plugged pump back in when replaced