Q:

What are symptoms of low fuel pressure?

A:

Quick Answer

Low fuel pressure results in several issues for the engine, including rough idle, poor performance and decreased fuel economy. If the pressure is too low, the engine does not start. Fuel-injected engines are especially susceptible to problems with both fuel volume and fuel pressure.

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What are symptoms of low fuel pressure?
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Full Answer

Fuel pump and fuel pressure regulator problems lead to low fuel pressure. Mechanics use several different fuel pressure tests to determine the underlying cause. Most vehicles have a port to attach a fuel pressure gauge to the line for testing; manufacturers vary, however, in the particular test they recommend for specific vehicles. If the fuel pressure tests within specifications but the vehicle continues to fail to start, the problem is often with the fuel injectors.

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Related Questions

  • Q:

    How do you test fuel pressure regulators?

    A:

    To test a vehicle's fuel pressure regulators, connect the fuel pressure gauge to the fuel rail and start the engine with the vacuum line detached, and then attach the vacuum line and observe the drop in pressure on the gauge. If the fuel pressure drops around 5 lbs. per square inch, then the pressure regulators are working.

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  • Q:

    What is a fuel tank pressure sensor?

    A:

    The fuel tank pressure sensor measures the positive and negative pressure in the fuel tank. This sensor also monitors the vapors in the engine.The information gathered is sent to the engine control computer. If there is an issue, then the automobile's check engine light comes on.

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  • Q:

    How do you install a fuel pressure regulator?

    A:

    To install a fuel pressure regulator, disconnect the fuel line to the old regulator, install the gauge, and then reconnect the fuel pump to the fuse. Disconnect the battery, and install the new regulator. Before starting, make sure to wear proper safety equipment, including gloves and eye protection.

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  • Q:

    How do you test the pressure of a fuel pump?

    A:

    Check the pressure of a vehicle's fuel pump by hooking a pressure gauge to the fitting of the fuel pump, having an assistant rev the engine and checking whether the pressure matches the vehicle's specifications. Eliminate the filter as the source of the problem before conducting this test.

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