Son just bought 1996 Blazer, had the fuel pump replaced less than a month ago, was at friends house had car parked a little on a down hill slant, went to start it in the morning, acts like it wants to start but wont turn over. Put gas in carborator, started for a second blew smoke out the exhaust then shut back off. The fuel pump is less than a month old and the car had 1/2 tank of gas. Any suggestions?
Replace fuse and relay.also check oil pressure switch.it controls fuel pump also. check fuel pump wires and fuel injector fuse .if all is good pcm could be faulty it controls fuel pump on .command circuit
scan to see if crank sensor and cam sensor working.i remember that some cases if crank sensor dont work.pcm will disable fuel pump.if all good check or replace fuel pump wires also make oil pressure swich is working.MAKE SURE YOUR PCM IS WORKING NO BLOWED FUSES.YOUR PUMP CAN ALSO BE DEFECT FROM FACTORY.
ALSO CHECK OIL PRESSURE BY REMOVING OIL SENDING UNIT GET OIL PRESSURE GAUGE TESTER..I REMEMBER OLD SCHOOL. IF YOUR OIL PRESSURE WAS REAL LOW .THE FUEL PUMP WILL NOT COME ON.THAT WAS A SAFETY FEATURE GENERAL MOTOR USE TO KEEP FROM BLOWING THE ENGINE.YOUR OIL PRESSURE IS SUPPOSE TO BE 18 PSI AT 2000 RPMS.FOR 4.3 ENGINE. 5.7 ENGINE IS 18 PSI 2000 RPMS .THE 6.4 6.5 7.4 ENGINES 40-45 PSI 2000RPMS.
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We had the relay switches and the filter and was told that apparently the pump should make a noise when you first start it, and it doesnt. Should we still check all the other items?
thank you for your help.
Thank you , we had blazer towed to where it was originally fixed, not really sure if I now trust their work. They said it is the fuel pump. What is the PMC ? Also, once we get it back, should I have someone else I TRUST to check the things you mentioned previously. to keep it from happening again. My son is using this car for college 3 hours away and I dont want it breaking down on him again. Is there something that could have caused the pump to go so fast? Thank you for all your help.
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