Fuel Pump - Honda Prelude 1993 Service Manual

Hide thumbs Also See for Prelude 1993:

Table of Contents

Fuel Supply System

Because of its compact impeller design, the iuel pump is installed inside the tuel tank. therebY saving space and simplify-

ing the fuel line system.

FUEL pUMp CROSS SECTION (ToD viowl

FUEL PUMP CROSS SECTION (Side vtew)

rFr rFF var vF

RELIEF VALVE

DISCHARGE PORT

ARMATUBE COIL

FUEL PUWIP CASING

The fuel pump is comprised of a DC motor, a circumterence flow pump, a teliet valve tor

protecting the fuel line systems,

a check valve for retaining residual pressure, an inlet port, and a discharge

port. The fuel pump assembly consists of

the imoeller (driven by the motorl, the fuel pump casing {which forms the

pumping chamber), and the fuel pump cove,.

"o PGM-FI main relav actrrates the

le impeller'

(1) When the engine is stsrted, the PGM-FI main telaY actuates the fuel pump' and the motor turns tl

Differential pressure is generated by the numerous grooves around the impeller'

(2) Fuet entering the inlet port flows inside the motor from the pumping chambef and is torced throlgh the dischargo

oort via the check valve. lf fuel Jlow is obstructed at the discharges side of the fuel line, the relief

valve will open

to bypass the fuel to the inlet port and prevent excessive fuel pressure'

(3) Whe; the engine stops, the fueipump stops automatically. However, a check valve closes by spring action to retain

the residual pressure in the line. helping the engine to restart more easily'

Troubleshooting