1998 GMC Yukon FUEL PUMP OR WHAT CAN IT BE??

1998 GMC YUKON
105,000 MILES • V8 • 4WD • AUTOMATIC
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ANDREAFRACCARO
  • MEMBER
  • 1 POST
Hi there!! I have to pour gas into throttle body to get it started..it hesitates a little but then stays running. I can drive around as long as I dont shut if off and wait till it cools. It will start if I try right away, but not more than 10 minutes. Does the fuel pump only work on start up or does it continually run as long as the car is running ?? I am stumped and I have no way to get it in anywhere, so I hope you can help. Oh..There is a new fuel filter and new fuel pump relay ...still nothing.
Sep 18, 2008 at 10:53 AM
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PEAR69
  • ✓Experienced Mechanic
  • 1,482 POSTS
When you turn your key the fuel pump turns on and your fuel system pressurizes. If you do not crank the engine shortly after turning the key -- the pump will shut off -- but when you crank the engine -- the pump runs constantly -- yes , as long as the car is running.
Being that you pour fuel in the throttle body to get it started may indicate that the Throttle Position Sensor (TPS) may be bad. Test it or have it tested for proper voltage function. Also, try changing the Coolant Temperature Sensor (CTS). Testing the CTS is too complex and they are cheap to replace so just replacing it isn't a bad move.
Sep 18, 2008 at 11:42 AM
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