Question about 1999 Pontiac Montana

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Fuel pump replace /swap out and voltge testing

I've recently started haveing fuel problems . that makes the fuel pump work intermitintly . now either the old pump or the replacement pup run . thats upon turning the key to the on position i get a reading of 10 to 11 volts for like 1 to 2 seconds then drops to zero volts . my question is is how much voltage should i read on the volt meter im useing a digital multi meter

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  • 202 Answers

The only time you have 12 vdc is when u crank the engine. Maybe the fuel pump relay is faulty the coil for the relay is not strong enough to hold the contacts, try swapping or changing a new relay,

Posted on Jul 27, 2009

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