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Electrical diagnostics

PORSCHE 928 FUEL PUMP DIAGNOSIS

Traced the fuel pump circuit using the wiring diagram, checking the fuse and relay and verifying voltage at the red/green wire at the pump. The pump would not prime or deliver fuel, leading to a diagnosis of fuel pump failure.

The job

Diagnose a fuel pump failure on a Porsche 928.

Work performed

Followed the wiring diagram, tested the fuse and relay, and verified voltage at the red/green wire at the pump. The pump would not prime or pump fuel.

What the photos show

Diagnosis completed. These photos document access and testing; pump replacement has not been reported.

Porsche 928 in the workshop during fuel pump diagnosis
Porsche 928 in the workshop during fuel pump diagnosis
Porsche 928 engine bay during diagnosis
Porsche 928 engine bay during diagnosis
Fuel pump and wiring exposed beneath the Porsche 928
Fuel pump and wiring exposed beneath the Porsche 928
Multimeter connected during Porsche 928 fuel pump testing
Multimeter connected during Porsche 928 fuel pump testing
Rear of the Porsche 928 with fuel pump testing equipment
Rear of the Porsche 928 with fuel pump testing equipment
Rear access during Porsche 928 fuel system diagnosis
Rear access during Porsche 928 fuel system diagnosis
Porsche 928 fuel pump diagnostic setup
Porsche 928 fuel pump diagnostic setup

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