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.
Fuel Pressure
Fuel system diagnosis should begin with determining fuel system pressure. If fuel pump does not run, inspect fuel pump fuse in fuse panel. If fuse is not blown, see FUEL PUMP and FUEL PUMP RELAY in I - 4-CYL SYS/COMP TESTS article. Refer to WIRING DIAGRAMS article for specific circuit or wire color reference.
- Relieve fuel system pressure. To relieve pressure, remove fuel pump fuse, start engine and allow to run until engine stalls due to lack of fuel. Crank engine an additional 2 or 3 times to verify all pressure has dissipated.
- On Pathfinder, Pickup and Sentra, disconnect fuel inlet hose at fuel injection body. On all other models, disconnect fuel hose on fuel filter inlet side. On all models, install fuel pressure gauge.
- Start engine and check fuel line connections for leakage. Check fuel pressure with engine idling. Record fuel pressure gauge reading. Disconnect vacuum hose from pressure regulator and immediately note fuel pressure. Record fuel pressure gauge reading. See REGULATED FUEL PRESSURE table.
| Model/Application | At Idle w/o Vacuum psi (kg/cm2 ) | At Idle w/Vacuum psi (kg/cm2 ) |
|---|---|---|
| Pathfinder & Pickup | 44 (3.1) | 36 (2.5) |
| Pulsar NX SE | 43 (3.0) | 36 (2.5) |
| Pulsar NX XE | N/A | 43 (3.0) |
| Sentra | N/A | 43 (3.0) |
| Stanza | 44 (3.1) | 37 (2.6) |
| 240SX | 43 (3.0) | 33 (2.3) |
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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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