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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Aug 21, 2014 | 1999 Cadillac DeVille

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Dear Fixya, My 1993 excel hyundai turns over but won't start, we put plugs and wires and new fuel gasket. we r wondering where the fuel pump is, is there one or two pumps and how to get to them to fix...

Have you checked for spark first? Sometimes a car won't start due to no spark. This condition is usually caused by: Security system, bad ignition module, crankshaft sensor, camshaft sensor. You check it by pulling a plug wire and putting a screwdriver in the wire to see if it arcs. If it is getting fire look for the fuel pressure release valve usually located on the fuel rail, looks like a tire valve stem. If it shoots out gas, and you hear the fuel pump prime, check the fuel pressure regulator. It could also be the timing. There are four things needed for a car to start: fuel, spark, timing, compression. As for your question, as far as I know there is one fuel pump, you have to drop the tank to fix it. Hope this helps.

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1993 Chevy K-1500 5.7 L TBI Starts normally when cold - Difficulty starting hot - Have to hold accelorator to floor to start - Takes 2-3 mins. at approx 1/3 throttle (with much smoke) and everything is...

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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No start. change fuel pump and runs perfectly for one day. next day starts drives out of the driveway and sputters and stalls down the road. checked the fuel censor. ok. fuel regulator. ok. clean the...

Get the o2 sensor checked.The o2 sensor before and after catalytic converter.Also check the fuel pump relay in the engine compartment fuse box under hood.Try cleaning the sensor, then check.If its getting to much fuel.then it can be problem with o2 sensor.Or fuel pressure regulator.Regulator is checked ok, so get the o2 sensor checked and replaced.----------------

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94 lt1 cranks a while before car starts. When car starts the car runs fine.

You may be losing fuel pressure. There is a fuel pressure regulator in the fuel line. It has a check valve in it. If the check valve is bleeding off then you have to get fuel pressure pumped back up. You can verify by turning the key on and letting it sit for about 5 seconds, turn off and then back on and repeat 3 times. This will pump fuel back up to the regulator and should start right away.

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My 2005 dodge magnum sxt AWD is having starting problems. It has happened twice so far. I start the car and then it dies. start again and it dies again. try again and it won't even start. I've checked...

I'll be honest, it sounds like the transmitter in the key isnt reading. A key remake without the factory transmitter will start the car, but only keep it running for a few seconds before cutting power to the motor. your electronics will still run....This may be too obvious, but honestly, thats what it sounds like.

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My car starts and runs then it wont go anymore and eventually stalls out. i changed the fuel pump all the fuel pump wires,the spark plugs ,the distributo ignitor,and the main relay. my teacher says drain...

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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