Question about Oldsmobile 88

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Fuel rail pressure problems

Drove car to Meijer came back out and wouldn't start, got it back to the house didn't hear fuel pump whine so replaced the pump and filter drove for a week and all of a sudden started to lose power and stalled,then wouldn't start. What should i check after checking the fuel pressure?

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The injectors may have gotten dirty from changing the fuel pump and filter. Also check for water in the fuel system. It may not be fuel related at all.check plugs ,coils ,wires to see if they need replacing. Hope this helps.

Posted on Dec 29, 2013

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Posted on Jan 02, 2017

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SOURCE: Stalling

Possibly faulty ignition module is the problem, stalls when engine is hot when you sit for a while it cools off and runs again until it heats up again, those are usually the symptoms of a bad ignition module and after a while it may give out all together and not run at all, usually if the module is at fault it shuts down the fuel pump so the engine don't load up with fuel, do to when engine continuously cranks over the injectors never stop squirting fuel and flood the engine do to lack of spark which is produced by the module, this could possibly be your problem.

Posted on Nov 01, 2008

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bunnydawg
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SOURCE: 2003 bmw 325i no fuel pressure loses power to pump

replace the fuel pump relay

Posted on Dec 03, 2009

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1 Answer

Car wont start suspect petrol pump


Turn your key to "ON" or "RUN" position. You should hear a whine coming from the rear of your car for a couple of seconds then stop.. That is the fuel pump priming your fuel delivery system. After you start your car, you should continue to hear the whine, but not as loud. That is your fuel pump delivering fuel to your engine. If you don't hear a whine then check all connections, fuses, relays related to your fuel delivery system.. If you hear the whine for prime, then check your fuel rail(s) for pressure. If you have pressure, then it is likely a Spark or an Air problem. Do you have any check engine warning lights on? If so, take to autozone (or similar) and they can check the error codes (DTCs - Diagnostic Trouble Codes) and print them out for you to work on.

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It wouldn't hurt to check fuel pressure with a fuel pressure gauge. you should see somewhere around 48 - 55 psi. the test port is on the fuel rail about in the middle of the rail and on the drivers side.

If the fuel fuel pressure is low it wouldn't hurt to make sure there is power to the fuel pump before condemning it. Power is supplied to the pump by the larger of the two grey wires.

The fuel pump is located in the fuel tank and the fuel tank will need to be dropped from the vehicle in order to service the fuel pump.

If you decide to replace the fuel pump get an a/c delco or a delphi pump. These are the best two option for your vehicle. Do not get an airtex brand. They are not reliable pumps although they are cheap.

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have diagnostic codes checked to see if you have a cam or crank sensor fault. make sure fuel pressure is at the required pressure, just testing to see if you have fuel at the valve is not enough. replace all spark plug wires. if you replaced two then all are just as old and even when they "look good" does not qualify as "they are good". Replace coil pack. start up drive away happy

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My Buick roadmaster 1994 won't start changed the fuel filter but that didn't help put a brand new battery in it and it is not the starter.


Have you checked the fuel pump or fuse? First check for a blown fuse. I belive that is an electrical pump, when you turn the key on with engine off, you should hear a slight whine. The whine is the pump turning on and sending fuel to the enigne. Another way to check is to hook up a fuel presseure gauge to the fuel rail on top of the motor. There will be a rail that conects the fuel line to the injectors the rail is near the spark plugs, there should be a "capped" connection on the end of the rail. Remove the cap, hook up your gauge and check the pressure. Pressure varies w/ model, but it should be above 20psi. If you don't get a reading with the key on that indicates the problem is with the pump or the wiring going to the pump. Do a quick voltage test with the pump connections if you get 12 volts the pump is bad, if not there is damage to the wiring, a fuse is blown or the solenoid for the pump is bad. Avg life for a fuel pump is 100,000 to 150,000miles

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First, verify that there is gas in the vehicle. Next, listen for the pump to energize when you turn the ignition switch to the on position. If you dont hear anything, check the fuel pump relay. Swap it with another one next to it, they are often the same part. If it still doesn't energize, its most likely the pump thats failed. If you hear the pump energize, then the pump pressure needs to be checked. A fuel gauge needs to be connected under the hood on the fuel rail to read system pressure. Verify that its at factory specs. If not, replace the pump.

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If my pickup starts then shuts off does that mean the fuel pump is bad


This would be 1 possibility, can you hear the fuel pump whine or making a noise when you first turn on the key?
It should whine for a couple of seconds to pressurize the fule system then shut off until you try to start the engine. The best way to check is to connect a fuel pressure gauge to the fuel rail connector (looks like a tire valve stem) and the gauge screws onto this fitting. When you turn the key on you should see the pressure gauge read the pressure going to the fuel rail, when you start the engine you should see the pressure maintain pressure to keep the engine running. If not then the could mean that the fuel pressure is weak and would need replacing. Hope this helps

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