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Answer :
The test that checks the integrity of the high-pressure fuel system after service has been completed is the Fuel rail pressure test (Option a).
What is a Fuel Rail Pressure Test?
A fuel rail pressure test is conducted to ensure that the fuel system of a vehicle maintains the correct pressure needed for it to operate efficiently. The fuel rail is a component of the fuel injection system that distributes fuel to the injectors.
Steps to Perform a Fuel Rail Pressure Test:
Preparation: Ensure the vehicle is turned off and the key is removed from the ignition. Ensure that all tools required for the test are available, such as a fuel pressure gauge.
Safety Precautions: Wear suitable protective gear, as dealing with pressurized fuel can be hazardous. Ensure no open flames or sparks are nearby.
Locate the Schrader Valve: This valve is typically found on the fuel rail. It is similar to a tire valve and is where the fuel pressure gauge will be attached.
Attach the Fuel Pressure Gauge: Connect the pressure gauge to the Schrader valve. Make sure it is securely attached to avoid leaks.
Turn on the Ignition: Do not start the engine. This action will pressurize the fuel system, allowing you to get a reading on the gauge.
Record the Pressure Reading: Observe the gauge and record the pressure. Refer to the vehicle manufacturer’s specifications for the normal operating pressure.
Analyze the Results: Compare the recorded pressure to the manufacturer’s specifications.
- If the pressure is too low, it could indicate a leak, a failing pump, or a clogged filter.
- If the pressure is too high, it might be a sign of a faulty pressure regulator.
Conclude the Test: Once done, carefully disconnect the gauge and ensure no fuel is leaking.
Why is this Test Important?
Checking the integrity of the high-pressure fuel system ensures the engine receives the correct amount of fuel, optimizing performance and preventing wear. It helps diagnose potential problems early, thus averting costly repairs later.
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