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Nissan Micra Mechanical Fuel Pump Inspection Procedure - EF & EC-10
Reference · 1983-1992 MicraAll 115 service procedures
Step-by-step fuel pump inspection procedure checking suction, pressure hold, and air leaks.
Part of 1983-1992 Nissan Micra Service Procedures
This service manual page describes the bench inspection procedure for a mechanical fuel pump. It is a single page (EF & EC-10) from the Engine Fuel & Emission Control section of a factory service manual. The procedure lists five steps: (1) flush the pump by immersing it in a fuel bath while operating the rocker arm several times; (2) drain fuel, block off the inlet port, and verify the pump arm does not move; (3) remove the finger from the inlet port and listen for a suction sound confirming adequate suction; (4) block the outlet port, operate the rocker arm to build air pressure, and confirm the pressure holds for two or three seconds; and (5) block the outlet port, build pressure again, and submerse the pump in a fuel bath to check for air leaks. Two line drawings (reference codes SEF881A and SEF867A) show a technician holding the pump and blocking ports by hand while working the rocker arm; one callout reads "Dose not move" (does not move). A reader learns how to verify a mechanical fuel pump's valve sealing, suction, and pressure-holding capability without special tools.
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Frequently asked questions
- How do I test a mechanical fuel pump off the vehicle?
- Flush the pump in a fuel bath while operating the rocker arm, then drain the fuel. Block the inlet port and confirm the pump arm does not move; release the inlet and listen for a suction sound; block the outlet, build air pressure with the rocker arm, and confirm pressure holds for two or three seconds; finally, with pressure built up, submerse the pump in a fuel bath and check for air leaks.
- How long should a good fuel pump hold pressure with the outlet blocked?
- After building up air pressure with the outlet port blocked, the pressure should remain for two or three seconds.
- What should happen when the inlet port is blocked?
- With the inlet port blocked off, the pump arm should not move.
- How is a fuel pump checked for air leaks?
- Put a finger over the outlet port, build up pressure in the pump, then submerse the pump in a fuel bath and check for air leaks (bubbles).
- What confirms the pump produces sufficient suction?
- After blocking the inlet port, remove your finger and listen for a suction sound, which confirms sufficient suction was produced.
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