Edmunds Answers

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  • avatar MrShift@Edmunds 07/10/08 4:36 pm PST

    I don't think it is likely that modern cars will vapor lock. Normal diagnostics will apply--testing for fuel pressure in the fuel rail, if okay, check for injector pulse, if okay then check for spark at spark plugs. One quick check is to squirt some starter fluid in the air cleaner--if the car fires momentarily, you have a fuel delivery problem, not an ignition problem or injector pulse problem.

    Reading the computer's trouble codes is also helpful.

Answers

  • MrShift@Edmunds 07/10/08 4:36 pm PST

    I don't think it is likely that modern cars will vapor lock. Normal diagnostics will apply--testing for fuel pressure in the fuel rail, if okay, check for injector pulse, if okay then check for spark at spark plugs. One quick check is to squirt some starter fluid in the air cleaner--if the car fires momentarily, you have a fuel delivery problem, not an ignition problem or injector pulse problem.

    Reading the computer's trouble codes is also helpful.

  • webwander 08/13/08 4:38 pm PST

    Replace Fuel Pump. Most Likely Problem.
    Reason: If fuel pump doesn't build up at Least 30 PSI, The Fuel Will Not Circulate Back To Tank, whereby cooling it. Test by using a pressure gauge hooked to fuel rail. Disconnect fuel pressure regulator vacuum LIne. The pressure should exceed 30 PSI (simulating throttle depressed for extra pressure) Should be about 30 PSI idling with vacuum line attached & 39 PSI if unhooked. The fuel not circulating will boil inside the injector manifold, and cause vapor-locking. Temporary fix included using a piece of insulated sun shield wrapped around the fuel rail underneath the intake manifold, leaving off the A.C. & hood up on safety latch. Relieve the pressure in manifold using a pointed object (key?). Be careful, you will lose some fuel, but by circulating a little fuel, you might be able to get going, and if on the highway, the added air flow and insulation might keep you going. Hope this helps.

    Source: Personal Experience and thought.

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