Question about 2000 GMC Denali

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Can't fill up with gas 2004 Denali

The vacuum keeps tripping when I fill up with gas. I can only get $.20 of gas in before it trips the vacuum. Any ideas?

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Is the tank venting correctly and is the gauge reading correctly install a scan tool and read the gauge for proper operation and the vent solnoid kdc744

Posted on Jan 27, 2009

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This is a frustrating problem. For many years I have had to change the way I keep track of fuel in my car that has a defective fuel sender in a tank that is very hard to remove.

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Normally, air flows through that tube while you're filling and the gas keeps flowing as long as you hold down on the trigger. When that hole gets covered by gasoline (when your tank is full), a vacuum forms inside the nozzle and an automatic shutoff switch gets tripped, turning off the flow of gas with a thunk. Next time your fueling up try to reposition the nozzle.

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