Question about GMC Cars & Trucks
2004 GMC envoy 4.2L i replace a new fuel pump assembly and the pump want run when i turn the key on and i don't hear the relay click the fuses are good the relay have numbers on it and they are #1, #2, #3, #4, #5, which one do i connected a jumper wire to to make the fuel pump run? is number 29, the fuel pump relay in the fuese box? do the inertia fuel shutoff switch red button suppose to be up or down? hope you can help me.
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Posted on Mar 14, 2019
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Posted on Jan 02, 2017
Your ECU is what acctivates your fuel pump realy. Put the key on the run possition and pull the ecu fuse for a few seconds and reinstall it ans it should accivate your realy for 5 seconds, Good luck.
Posted on Apr 06, 2009
What you need to do is check you fuel pressure. Go to a local auto parts store and buy a fuel injection pressure tester. The pressure fitting is on the top of the motor its a 3/8 ish sized metal line and has a screw on fitting like a tire valve does. This line comes up from the back of the motor to the right of the distributor and goes down into the intake. Make sure to have a rag handy to catch the fuel seepage. After you connect the pressure tester turn the key on and off three times and read the gage you should have atleast 58 pounds of pressure. If you have 56 pounds it won't run because the fuel injectors are a poppit valve style and need atleast 58 pounds of pressure to operate.
Posted on Sep 12, 2009
It won't hurt to jump sire to drive, It is designed to pump all time when the engine is running. The only problem is the pump should not be on if engine is not running since it is designed that way to prevent a fire while pump continues on once engine is stops in a car accident. There is a control device to immobilize the fuel pump, if there is no speed sensor signal from the crankshaft. This needs to be located and fixed.
Posted on Oct 14, 2009
SOURCE: I replaced fuel pump and
not knowing what kind of vehicle it is it is hard to tell. some gm cars and trucks have oil sending units that will not allow the vehicle to start unless it has oil pressure. they start going out and sometimes they start and sometimes they won"t.
Posted on Dec 08, 2010
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