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by SparklinSarcasm on August 12th, 2009

SparklinSarcasm

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Does anyone know what it means when your jeep will randomly quit starting unless you put your foot on the gas pedal and what does it mean when it stops without laying on the gas?? (The mechanic said the battery and alternator were perfect...)

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Answers. 4 helpful answers below.

  • by Spicy Hot on August 12th, 2009

    Spicy Hot

    Normally on checking the fuel, a pressure gauge is used. GM and Ford use a circulating fuel system where the pump in the gas tank pumps fuel to the engine and around a manifold from which the injectors take fuel. The excess fuel is pushed through a pressure regulator and returns to the tank. The gas is pumped in a circle. There is a valve on the supply line at the engine where you can connect the gauge. The injectors require a certain amount of pressure to spray fuel into the intake. There is normally a filter in the supply line at the tank. It sometimes gets stopped up causing low pressure at the engine. You'll have to look up the pressure for your system, they vary from Manufacturer to Manufacturer and model to model. Some are as low as 40 psi and some above 60 psi.

    If you are going to do much work on your vehicle, you should buy a volt/ohm meter and a fuel pressure gauge. They can save you a lot of time.

    If you suspect the coil, the resistances on it are about 0.90 to 1.5 ohms on the primary coil winding and about 1300 to 1400 ohms on the secondary. The primary wires are the two small wires going into the coil. The secondary can be measured from one of the primary wires to the highvoltage output at the top.

    You can get data on your jeep at www.autozone.com. I got the coil resistances from there. I didn't look up the fuel pressures. If you need shop level data, autozone also has Alldata, where for a fee, you can get very good prints for your vehicle.

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  • by Rollie on August 13th, 2009

    Rollie

    How long since the fuel filter has been changed?? Your owners manual probably says from 20 to 30 thousand but many don't do it until there is a problem like you describe.

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  • by zwatcher on August 12th, 2009

    zwatcher

    A. time to get a new mechanic
    and/or
    B. time to get a new jeep

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  • by Spicy Hot on August 12th, 2009

    Spicy Hot

    Have you checked your fuel pump or filter?

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