Question about 2003 Toyota Corolla

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I need to know the normal working pressure of the fuel pump please...

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All you need to do is hook it up right and the cars computer will take care of the rest.also there is a buton on the engine you need to press it looks loke the valve on a tire use a pin to release the presure it's called apressure gas line it should be next to the fuel ingectors ok

Posted on Oct 12, 2010


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Please rate the answer you received. This is how we know your answer helped. Should you need further help please just ask. Thank You for using Fix Ya. Roger

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The fuel pressure should hold at or near the 45 lbs after you shut the truck off.
You have one of three problems causing this.
One, the fuel pressure regulator is leaking internally and allowing fuel to return to the tank via the return line. To verify, use a pair of pliers and gently pinch the return line off. Turn the key on to the run position, the pump will run for 2 to 5 seconds and pressurize the line. Watch the pressure gauge, it should hold pressure. If it does, change the regulator.

Two, the check valve at the pump is weak. To verify, turn the key to the run position, when peak pressure is reached, gently pinch the pressure line and watch the pressure gauge. If the pressure remains near the peak pressure the check valve is bad. Replace the fuel pump.

Three, if neither of the above procedures work, you have a leaking injector. You will want to remove the fuel rail, pressurize it to find the bad injector.

Any one of these failures will cause the "vapor" issue you describe.

Good luck, let me know what you find.

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