Question about 1991 Oldsmobile Cutlass Calais

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1991 Olds cutlass Cala 4cyl 151 5 speed

No fuel pressure when parked in garage in 03. 08 replaced sending unit and pump, drained tank, new fuel. Still no fuel pressure at throttle body. is there a wiring problem or selenoid issue? car has 250000 miles. has been parked since 2003.

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Sounds sort of like a map sensor or the heating and cooling sensor. Both help regulate the fuel. also need to check to see if the thermastat is stuck to open. If the hot and cold sensor is giving a false reading of hot to the computer this can cause the car not to pump fuel. If the sensor is bad also replace the therm as well.

Posted on Apr 08, 2009

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http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?pageId=0900c152800b86e8

See if this is the one you have...

  1. Relieve the fuel system pressure and check that there is an adequate quantity of fuel in the tank.
  2. Connect a fuel pressure gauge to the pressure connector fitting located on the end of the fuel rail. On 5.7L engines, it is located inline shortly before the fuel rail and accumulator.
  3. Make sure the ignition switch has been in the OFF position for at least 10 seconds and that all accessories are OFF.
  4. Turn the ignition switch ON and the pump will run for about 2 seconds. Note the system pressure with the pump running, it should be between 40-47 psi.

The ignition switch may have to be cycled to the
ON position more than once to obtain maximum pressure. It is also normal for the pressure to drop slightly when the pump first stops, but it should then hold steady.
  1. If the pressure is not as specified, verify that fuel pump operation is heard in the tank.
  2. If fuel pump operation is not heard, inspect the fuel pump relay and wiring.
  3. If fuel pump operation is heard, inspect the filter and lines for restriction.
  4. Start the engine and make sure the pressure decreases about 3-10 psi at idle.
  5. If fuel pressure does not decrease, inspect the fuel pressure regulator and hose.
  6. Disconnect the fuel pressure gauge.

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Vehicle keeps stalling. Replaced fuel filter and altenator. It'll run good but when you come to a stop it'll stall. Is this the fuel filter??


I have had the same problem. I changed fuel filter, added fuel injector cleaner, still runs rough as hell at a idle. Didnt think it could be the fuel pump, because ran ok at hiway speeds, it only stalled when giving less gas, not more. So in theory I figured couldn't be fuel pump. I was so wrong. At hiway speeds you have inertia, engine is running faster already etc. Its the fuel pump. 90% of the time in GM cars thats what it is when it behaves this way.
to change the fuel pump:

In the tank, the following is a run down of how to replace it..

This is actualy a pretty involved repair. You have to have the car jacked up on all 4 corners, or up on a car lift. Disconnected battery, and it is recomended you have as much gas as posible drained from the tank. Then underneath the car you will find the tank with 2 staps holding it in place. Those staps should be taken off or at least out of the way while the tank is being supported. There are vacume lines, the fuel fill and vent lines, and the wiring harness that all have to be unhooked. Once you are sure that all lines are disconnected, drop the tank and pull to the side. Wash the top of the tank off, there will be dirt and rocks on top of it, and you need to get all of these out of the way. You will see where the wiring harness goes into the fuel sending unit. Around that peice is a slide ring that has to be gently hammered counter clockwise. Once it is free from its retaining clips, the fuel sending unit will have to be wiggled out very carefully. Once out, you will see the fuel pump mounted in line on the fuel sending unit. You will have to work out how its mounted in line, and get it off and unplugged. Reinstall the new fuel pump and reverse the procedure.
Parts needed:
Fuel Strainer
Fuel pump
Lock ring O-ring
Posibly the fuel sending unit if you were having problems with your gas gauge.

Hope this helps!

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