Question about 1995 Buick Riviera
PART 1 ( fuel pressure )
this ia a stock 5.0 HO . i have 30 psi of fuel at idle . it will increase to 40 psi if i remove the vacuum from the fuel regulator and it does go back to 30 psi when vacuum is replaced . if i close/ pinch of the fuel return from fuel regulator to the tank my fuel pressure does not increase ( i beleive it should ). with the fuel gauge still attached to the fuel line i drive the car and the fuel pressure drops down to 20 psi and lower. this is my problem, under mid to heavy acceloration i get popping / backfire out of the throttle body . i noticed it is only when the fuel pressure is low. by the way this is with a new fuel pump . ( i think i have a defective fuel pump ) . and i beleive the fuel pressure should rise under acceloration. can someone confirm this?
PART 2 ( fuel guage )
the gauge did not ( always read full ) . i got a boneyard sending unit and it tested 12 ohms full and 74 ohms empty ( i beleive this to be the correct specs ). once the tank was back up and filled with gas, the dash gauge reads closer to empty with the more gas i put in. can anyone help here?
IS IT POSIABLE THE TWO HAVE ANYTHING RELATED IN A SHORTING OUT / LOSE OF POWER KIND OF WAY?
Buick with a 5.0?? OK, regardless, pressure should not drop like that. Possible that fuel filter is full of **** & should be changed, or, you may indeed have a bad pump... (can happen). Sending unit: sounds like you have the leads reversed or the unit is somehow different than the one you replaced.
Posted on Dec 26, 2008
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