Question about 1998 Buick Regal

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Where is the fuel tank pressure sensor located in a 1998 Buick Regal Supercharged?

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Hi,

I believe that I can help you.

Go to your throttle body.

  • A large diameter fuel rail is attached to the top of the intake manifold and supplies fuel to all of the injectors.
  • A fuel pressure cap is located on the rail for quick pressure checks,
  • The electric fuel pump is attached to the fuel sender assembly in the fuel tank. It pumps fuel constantly from the tank, through the fuel rail on to the engine and back to the tank.
  • The fuel pressure regulator that is mounted on the fuel rail maintains pressure across the injectors under all operating conditions.
Unfortunately, my scanner is inoperative and I cannot provide you with a diagram

Posted on May 18, 2011

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Greetings,

If your 1998 Buick Regal is the GS model (supercharged), there is a resistor that is either switched into the circuit to the fuel pump or it is bypassed. The idea is to not put as much voltage to the fuel pump under idle or low load conditions. However, under high power conditions, such as when you punch it or drive up a steep hill - which usually also brings in the supercharging, then the circuit bypasses the resistor to give the fuel pump more voltage and, hence, more fuel pumping capacity to meet the higher fuel demand.

The resistor is located in a bad spot where it can pick up lots of road debris, slush, dirt, etc. Thus, it can fail. When that happens, you can start the car but then the resistor circuit is activated and, because the resistor has failed, no voltage gets to the fuel pump and it shuts off, then the car shuts off. If you immediately hold the accelerator down after starting the car (but not to overspeed the engine), the engine will keep running but at a very high RPM.

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