Question about 1998 GMC Sierra

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97 gmc pickup, 5.7 eng, fuel pump not operating,

Checked all fuses, changed pump relay. new battery & connections.
2 days ago, battery connection problem, cleaned & charged battery.
engine started & ran, 2 hours later, same problem. changed to new battery & connectors, could hear fuel pump run, engine started. now pump not running with key turn, no start. grounding problem with pump circuit?
can change pump if needed, but would like to know for sure first.
money very tight. new pump $100.00, pump assembly $220.00.
thanks for help.

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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

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First get a test light test the power to the fuel pump if there is power it the fuel pump if no power test for power at the relay and fuse panal
much better price on fuel pump from highflowfuel on ebay ($59.98)
free quick shipping (3 days) and it was a perfect fit

Posted on Sep 10, 2009

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