Question about 2001 GMC Jimmy

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Engin shutoff while driving

While driving my car engin shutoff which force me to park bisde the high way after around two min's start back ,i changed the fuel filter then become ok ,when i drived for more than 100KM it happend again.

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Possibly water in the tank and some other contaminant in the tank....possibly failing...clean filter is easing flow and pressure function from your fuel pump.

Posted on Jun 24, 2009

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Your fuel pump relay may be going bad, you can find that in the glove box behind a panel that say's relays. The middle relay is the fuel pump, you can swap out the relay with one of the other ones and see if there if you still have the problem. The other thing to is the wire harness from the frame on the driver's side to the gas tank for the fuel sending unit may have gone bad due to corrosion. As the fuel pump draws current to keep it running, the wires heat up and the wire may break the contacts till it cools of and same as the fuel pump, as it heats up it may fail till it cools down. If you still have the original fuel pump it may be at the end of it's life. The fuel pump is only good for 150,000 miles (250,000 km) and then any mileage after that is borrowed time. Check the fuel pressure at the shredder valve along the fuel line by the distributor drivers side, it should be 60psi to 65psi during prime with the engine not running. With the engine running it will drop about 5psi. Any other readings will give you a no start or poor performance. Good luck and hope this helps. keep me posted and try to get the truck scanned for DTC codes, Auto Zone scan free of charge and most larger auto parts store scan free of charge also. 

Posted on Jun 24, 2009

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