Fuel Pump: Description and Operation

Fig. 15 Fuel pump (typical):

Fig. 16 Fuel pump relay operation chart:

Fig. 26 Fuel pump relay operation chart.:

The fuel pump is mounted near the fuel tank and right rear wheel, except on 1984-86 200SX and 1986 4WD Stanza Wagon models, where it is mounted in the fuel tank. The pump utilizes a wet type construction where a vane pump with roller is directly coupled to a motor filled with fuel.
The relief valve, Fig. 15, in the pump opens when the pressure in the fuel line rises over 43 to 64 psi due to a problem in the pressure system.
The check valve prevents abrupt drop of pressure in the fuel pipe when stopping the engine.
Refer to Figs. 16 and 26 for fuel pump and relay operation.