Posted by Jim in NY on December 20, 2007 at 20:03:41 from (206.15.138.108):
In Reply to: OT, GMC Question posted by Red Dave on December 19, 2007 at 04:34:12:
Sonds like the fuel pump.... heres what a Mechanic friend of mine does in his checks for pump operation 1) turns the key on , gets under the auto and uses a stick(stehoscope) to listen for the pump humming sound, 20 if he cannot hear it he raps real hard on the tank and most of the time the pump will start up and if it doesn't it's bad anyways, 3) if it is pumping to begin with he then checks the pressure at the regulator rail and the filter, 4) if pressure is good and it stays for 12 hours give or take, he checks the regulator for faults..... most of the time the pump is not running when checked underneath and as soon as he raps on the tank and it starts up he calls the customer and tells them of what the expense "may be".. becuse it can be involving i.e. fittings, sender , ect. may want to begin with currrent at the pump and filter ?good luck
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