Fuel Pump: Testing and Inspection

*** UPDATED BY TSB #EF84011, July 1984

NOTE: Nissan released a new style mechanical fuel pump for improved durability. When replacing, make sure you get the later upgrade. Refer to TSB for more details.

The fuel pump can not be disassembled.

WARNING: Before starting to work on any part of the fuel system, disconnect ground cable from battery. When disconnecting fuel hoses, use a container to catch fuel remaining in the hoses.


1. Flush pump by immersing it in a fuel bath and operating rocker arm a number of times.

Fuel Pump Inspection:

2. Drain fuel from fuel pump. Then block off the inlet port and check that pump arm does not move.
3. Remove your finger from the inlet port and listen for a suction sound which will confirm that a sufficient suction was produced.

Fuel Pump Inspection:

4. Block off outlet port (for non-California: outlet port and return port) and once again operate the rocker arm. After air pressure has been built up, confirm that the pressure remains for two or three seconds after.
5. Put a finger over the outlet port and again build up pressure in the pump. Then submerse the pump in a fuel bath and check for air leaks.