1998 Buick Park Avenue NO FUEL

1998 BUICK PARK AVENUE
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350 MONTE
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Engine Mechanical problem
1998 Buick Park Avenue 6 cyl Two Wheel Drive Automatic 174K miles
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OK I BOUGHT THE CAR THINKING ALL IT NEEDED WAS A FUEL PUMP I CHANGED THE FUEL PUMP STILL NOT WORKING I CHECKED THE RELAY AND IM GETTING 12 VOLTS I CHECKED IT I WAS TOLE TO JUMP #3 STILL DIDNT PUMP. AT THE PUMP AND ONLY GETTING 8V. THE PUMP WORKS CAUSE I JUMPED IT WITH A SPARE BATTERY AND THE CAR RAN FINE SOMEBODY SAID SOMETHING LIKE THAT THE OIL PRESSURE SWITCH WILL MAKE THE FUEL PUMP NOT WORK AS A ENGINE SAFETY FEATURE. WHAT COULD BE MAKING THE PUMP NO PUMP WHEN IT DOES WORK?
May 19, 2008 at 11:46 PM
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RASMATAZ
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The computer energizes the fuel pump relay and power to the pump only last for 2secs when the relay de-energized. For initial priming of the fuel system. When the engine is cranking over oil pressure is being built up at which time the oil pressure switch will close and powers the fuel pump from there on. Check fuel pressure and also while cranking engine over check for injector/s pulses-fuel injector/s might not be pulsing therefore no fuel delivery to the cylinders.


https://www.2carpros.com/forum/automotive_pictures/12900_oil_sending_unit_and_fuel_pump_circuit_50.gif

May 20, 2008 at 12:22 AM
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OK BUT HOW CAN I CHECK FOR FUEL PRESSURE IF THE PUMP IS NOT PUMPING AT ALL IM GETTING GOOD PRESSURE BECAUSE I JUMPED THE FUEL PUMP OFF FROM THE TRUNK WITH A BATTERY JUST TO SEE IF IN DEED IT DID WORK SOMETHING IS KEEPING THE FUEL PUMP FROM PUMPING COULD IT BE THE OIL PRESSURE SWITCH?
May 20, 2008 at 12:30 AM
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RASMATAZ
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--------------------------------------------------------------------------OK BUT HOW CAN I CHECK FOR FUEL PRESSURE IF THE PUMP IS NOT PUMPING AT ALL IM GETTING GOOD PRESSURE BECAUSE I JUMPED THE FUEL PUMP OFF FROM THE TRUNK WITH A BATTERY JUST TO SEE IF IN DEED IT DID WORK .

It works but is it the correct fuel pressure and are the injectors pulsing-
May 20, 2008 at 5:41 AM
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350 MONTE
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yes but only when i jump it off a battery it wont work when i plug it in the car i need it to work properly. meaning i need it to work w/o jumping it. could the oil pressure switch be stoping the fuel pump from working. the fuel pump it self is not working on its own at all unless i make it because something is stopping it from working.
May 20, 2008 at 7:07 AM
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RASMATAZ
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Try checking the fuel pump control module behind right rear wheel house. See below


https://www.2carpros.com/forum/automotive_pictures/12900_fp1_4.jpg

May 20, 2008 at 2:15 PM