Question about 1997 Volkswagen Golf

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Fuel pressure regulator makes hissing sound

Hi. WHen I turn my ignition switch on, without starting the engine, should the fuel pump pressurize and shut off, or continue to run making a hissing sound. it also makes this sound when being driven. Seems like fuel pressure regulator making the noise. Car just quit on me while idleing, burned out starter.

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  • hank711 Mar 02, 2009

    I don't think the solution is correct in saying the pump shuts off. Unless the pressure switch is in the pump itself, it seems like the fuel bypasses through the regulator, as the regulator is controlled by vaccuum, it is not able to turn off the pump. I have replaced the regulator resulting in much better performance, but the pump still runs with the key on/engine off.

  • joel perez Jun 19, 2013

    no noise in pump or anywhere just low fuel pressure.

  • Anonymous Mar 14, 2014

    not airflow related, blew something above one of the cylinders, idles fine but burns oil and hisses

  • Anonymous Mar 17, 2014

    The engine will shut off while driving. Fuel pressure regulator just replaced.

  • Anonymous Mar 17, 2014

    Brake booster makes hissing noise with engine not running

  • Anonymous Mar 21, 2014

    Hi I was driving from work when I smelled something burning.I stoped,switched off the ignition,ppopped the hood and found that a wire running from the coil to the fan has been melted.I took it of and turned the ignition key.engine turns over nicely but car won't start.what to do please



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The fuel pump should prime for second or two when turning the ignition on. Then the fuel pump should run when the engine is cranked when the ecu detects a signal from the crank sensor. If the fuel pump runs all the time make sure the relay has not been bypassed with a piece of wire. If its been bypassed it leaves the car in a dangerous condition. In the event of an accident and a fuel line is ruptured the fuel pump will run continually with a huge risk of a fuel fire.

Posted on Aug 01, 2014

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Your fuel pump should cycle on until the proper fuel pressure is achieved then it should shut off

Posted on Jan 25, 2009

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  • s60six Mar 02, 2009

    in my experience with the many vehicles Ive encountered the pump shuts off if your engine is not running when the system reaches pressure. if the engine is running the pump will run continuously. An easy way to find this out try it on some friends vehicles. I have dealt with mostly north american vehicles however so i suppose your vw could be different but as i said all of the vehicles i have worked on work in the fashion i described earlier

  • joel perez Jun 19, 2013

    no noise the fuel pressure is just low fuel pressure

  • joel perez Jun 19, 2013

    Replaced with new parts fuel pump,fuel filter , fuel pressure regulator

  • s60six Jun 23, 2013

    without starting the car the fuel pump will shut off once the fuel reaches proper pressure



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Hi James,

That is a real good question. Have you checked the fuel pressure on the fuel rail to see how much pressure there is when it refuses to start? It sounds like you may be losing your fuel pressure because of the fuel returning to the tank when the engine is hot. This could be due to a faulty fuel pump assembly or a faulty fuel pressure regulator.

Try this: When it doesn't start, turn the key OFF and wait about 15 seconds, then turn it back to the ON position (do not try to start yet). Repeat this a second time, only this time turn the switch to the START position. If the engine starts, then it is definitle due to loss of fuel pressure in the fuel rail. You will then need to test your fuel pressure with a gauge and plug off the return line to determine if the problem is being caused by the regulator or the pump.

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There is a fuel pressure regulator on the fuel rail. It could be bad. To check this pull off the vacuum line and turn the ignition on without trying to start the car. If fuel comes out of the vacuum hose fitting the fuel pressure regulator is bad. Another possibility is a bad fuel pump. Check your fuel preasure. If low or non exisitant replace fuel pump only after checking fuel pressure regulator. Good luck.

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sounds like clogged or clogging fuel injectors,sorry for delay in the answer in your problem, been busy w/other issue . suggest easy solution to your problem, purchase lucas fuel injector cleaner,add to your fuel tank. cost $5.00 treats 20 gallons of fuel. just add the ammount that you need. follow the directions on the bottle, you can purchase at auto zone or advance automotive if need be to clear up the sputtering problem. note' there will always be hissing from the gas cap[normal] due to pressure from your fuel pump,it pumps around 180lbs of pressure to the fuel rail that operates your engine the fuel pressure regulator on the fuel rail;regulates the pressure to your injectors, that's what makes your engine run so smoothly.

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