Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Chart A-7B, Fuel System Pressure Test: Notes
When ignition is turned on, ECM energizes fuel pump relay for 3 seconds, allowing fuel pump operation. When fuel pump relay is de-energized, fuel pump stops operating. If engine is being cranked or is running, fuel pump will continue to operate as long as ECM is receiving ignition reference pulses. If ignition reference pulses are not detected, fuel pump will stop after 3 seconds.
Fuel pump delivers fuel through fuel filter to fuel injector and fuel pressure regulator, where system pressure is controlled at 34-41 psi (2.4-2.9 kg/cm2 ). Excess fuel returns to fuel tank through fuel return line.
- Verifies if fuel pressure is within specification.
- Checks fuel feed pipe and hose for leaks.
- Checks for faulty fuel pump and faulty pressure regulator.
- Checks for leaky fuel injector, throttle body or for a faulty fuel pressure regulator.
- Checks for leaks at fuel pump hose connections, faulty fuel pump or a faulty fuel pressure regulator.
- Checks for restricted fuel feed pipe, faulty fuel filter or restricted fuel return line.
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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