2002 Volkswagen Jetta TDI Logo
Posted on Jul 24, 2010
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Have a problem with my TDI parked it on a hill yesterday saw it leaking from the washer fluid side in front. Checked the fluid smelled like diesel. Started the car and parked it on flat spot. Tried to start it all it does is crank won't roll over. Pump the gas pedal and it fires up. Today it won't even fire up just cranks and cranks. ANY HELP PLEASE???

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Dan Horsefield

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  • Expert 287 Answers
  • Posted on Jul 24, 2010
Dan Horsefield
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Joined: Apr 09, 2010
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You may have a leaking fuel pressure regulator.
A Fuel Pressure Regulator is a simple mechanical device that holds constant fuel pressure or relieves excess fuel pressure by way of the pressure compressing an internal spring and opening an orifice back to the fuel pump.
Normally it is mounted on top of or near the TBI (injection) throttle bodies, on top of the injector, but if it's not visible there you will need to check a shop manual of follow the fuel line visually.

If it is mounted on the motor (not under the intake cover) you can remove a rubber hose and see if there's gas in the hose. If there is, the regulator has failed. The hose is only supposed to have air in it at all times.

A bad fuel regulator can allow gas to leak onto the ground or actually leak into the motor where it fouls the plugs.

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