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Lots of things could cause a no-start, Hendrik. Is your "Check Engine" light on? If so, please have someone get the OBD error codes from the car's computer.
Does it crank but not fire?
If it doesn't crank, check the battery condition, battery connections, ground connections to frame and engine block, starter solenoid, starter motor.
If it cranks, doublecheck your fuel pump installation. Make sure the new fuel pump is properly connected and properly electrically grounded. Look for a fuel pump fuse. Check for proper fuel pressure at the fuel rail, check the fuel flow rate. Check for spark, check or replace spark plugs, distributor cap, rotor, plug wires. Check valve timing, replace timing belt or chain if necessary. Check compression.
I had the exact same problem with a 91 GM vehicle.I replaced almost everything including the fuel pump. Months later I discovered I had purchsed and installed a faulty fuel pump,new from the factory.That was the last thing I would of guessed. the fuel pump worked when I tested it but would seize when it got hot during regular driving.One day I decided to let the car run in the driveway until it happened.I sat near the car so I could hear the pump run.All of a sudden the pump started to whine and fade on and off thats when the car shut off.I replaced it it a second time and it never happened again.You may have to put a fuel pressure guage on the fuel rail and run the car and watch when it happens.
The crank sensor is what pulses the ijectors,and makes the spark,so I would start at the crank sensor.Let me know how you come out.Check for any blown fuses also.Ecm fuse would cause this,but it may be called anything ,so check all fuses.
If there is no power to the fuse block then there has to be a main relay check that to see if it is blown. it is usualy located in the fuse block undr the hood.
Try the crankshaft position sensor. Sometimes they get covered in clutch dust and the sensor cannot determine No1 cyl. and then it will refuse to start. Sometimes they go faulty as well.
1985 buick somerset regal with 4 cyl. feul pump relay is mounted near back of passenger side strut tower top. if you are in front of vehicle it should be the right hand relay of the two.
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