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Feul Pump on 1999 Pontiac Bonneville

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After we replaced the fuel pump on the 99 bonneville. the car only starts when it wants to. What could be the casue of this problem.
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(4) Comments
An experienced technician with a good manual gauge will be able to check the fuel pressure. Figure low 40's in PSI.
the fuel pump is not sitting in the tank correctly or try changing the fuel filter under the rear driver door underneath the car near the frame