Question about 1991 Oldsmobile Cutlass Ciera

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My fuel pump runs after the car is off What can it be. We already changed the pump, relay, checked the injectors, spark plugs, everything possible is there another relay switch somewhere else.

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How long does it run?

Posted on Jan 25, 2009

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Everything has been checked ok but my subaru forester wont start. Engine cranks but car wont start. Is it a fuel pump problem?


Lets find out
  1. pull spark plug any one hold about 1/4 inch from engine block(with insulated pliers) and have someone crank the car. You should see a spark jump across to the engine repeatedly . if so ing system is ok
  2. You don't sat the year so pull the fuel line off where it enters the carb, throttle body or injectors whichever you have. put end in a jar crank eng just a little . if fuel squirts up into the jar pump is ok. should be a lot.
  3. This will tell you which system is causing the problem
Hope this helps Mike

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95 Taurus 3.8 SHO wont start replaced everything fuel pump to big relay is buzzing even new one im lost need help


Run tests. Fuel pressure correct? Spark at plugs when cranking? Fuel injector pulse working? Compression test?

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Spark at plugs? Fuel filter? Pressure on injector delivery line? Pressure relief valve? You may be able to measure fuel pressure at the pressure relief valve location. and return line. If you have spark, I'd say it's a fuel supply problem

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It's already not start before you changed or after changed ?
If before. the timing belt or might be broken , burn fuel pump's fuse, injector's fuse or main engine relay.
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I have 1983 porsche will not fire changed dem changed relay checked coil its good the car set in a garage 10 years can not get to fire


You injector are plugged,Below the fuel tank is the fuel pump you will need to test this for fuel sitting for ten years the fuel pulsation damper are dried out and you will have to run the fuel pump till the dampner unplugs,turn the key the fuel pump should of been heard if its not electrolyte has already settle in the pump and rendered it useless,you will need a fuel pump

Mar 09, 2012 | 1983 Porsche 944

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I checked my spark plugs and have a spark going to each plug. I changed the fuel pump thinking I didn't have enough fuel pressure. I sprayed some starter fluid in the intake and it started for about 5...


If you are getting spark and the engine tries to run on starter fluid, then you have lost fuel. Check that you are getting injection pulses at the injectors and check the fuel pressure at the fuel rail at the injectors. Check for power to the fuel pump when the engine is cranking, If you get no power to the fuel pump when cranking the engine, check fuses and relays. If the pump is running but you have no fuel pressure, check the fuel filter and fuel pressure regulator and replace any that are faulty. If the injection pulses are missing, check the supply relay which supplies power to the injectors first ( the injectors are earthed by the ECU) Disconnect one of the injector plugs and using a test light (buy one from a auto parts store) clip the end to a good earth on the vehicle body, switch the ignition on but dont start the engine, then probe the two connections in the injector plug. One of these connections should be active all the time with the ignition switched on. If it is, you may have a sensor failure (crank sensor etc), if it is not, check fuses and supply relays. A word of warning, the wiring you are dealing with is connected directly to the engine control, if you make a mistake, you can cause irreparable damage so if you have any doubts, take the vehicle to a professional..

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1994 Sierra stalls after it is warm...It will start right away if I shoot starter fluid down the throttle body or wait 15 minutes. I have had the pump checked and have replaced the Oil censor, feul filter...


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.

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Tuned up a 1993 chevy cavalier has spark won't start


Spray aerosol carb cleaner into the throttle body while an assistant tries to start the engine. If it runs for a few seconds then quits, you are not getting fuel into the engine. Check the fuses. You might have blown the fuse for the fuel injectors (possible if you removed any of the injector harnesses) or the fuel pump relay.
Charlie

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