Question about 1997 Buick LeSabre

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Fuel pump or regulator

Car won't start.
Electronics checked -ok.
fuel to valve

Is it the fuel pump or regulator

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Regulator if you have good pressure at the valve. when you turn the key on can you hear the fuel run for 10-20 seconds? take off vacuum line from the fuel pressure reg. is there gas that comes out the reg/vacuum hose? if so its the regulator!!

Posted on Oct 07, 2009

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This is almost certainly caused by a lack of fuel pressure . The fuel pressure will be fine while the engine is running but when it is switch off the pressure won't hold . In the trade we call this residual pressure . What happens when this fault occurs is that the fuel in the engine fuel rail will vaporize and hence the hard starting .

There are three possibilities : leaking injectors , a faulty pressure regulator valve or a faulty check valve in the fuel pump .

First thing to do is to check the fuel pressure while the engine is running and then switch the engine off , if the pressure drops drastically over a period of 20minutes then you will know you have poor residual fuel pressure . Note if you have not done this before seek help as this can be dangerous as you could set your car on fire .

Next , use fuel hose clamping pliers to pinch the fuel inlet hose ( having restarted engine and then stopped again ) . If the residual pressure drops you have a faulty check valve ( replace fuel pump ) . On the other hand if the residual fuel pressure stays remove the injectors and get them serviced . If the problem is still there replace the fuel regulator .

Note use an approved fuel pressure gauge - the fuel pressure is very high ( 250 - 500 kpa )










If the residual fuel pressure was ok do the same procedure on the fuel return line whilst

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I think it's possible that the fuel regulator is stuck open and allowing the fuel to return to the gas tank. If your car is like mine (1991 Acura 1.8 engine), you can try this experiment: Pull the vacuum line off the fuel regulator (it's on the end of the fuel injector manifold and a hose connects to it to return gas back to the gas tank) and temporary plug the hose with a small bolt or golf tee. If the regulator is not stuck open it will make the fuel injector manifold at the highest pressure. Start the car and see if it dies or keeps running ok. If it runs ok then the vacuum control is not working right. If this doesn't help, try changing the fuel regulator valve or pull it out and test it with a vacuum off and on. When the vacuum pressure is present to the valve the valve is suppose to open slightly, this allows fuel to bypass the fuel rail and return to the tank.

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