Fault Finding

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Fault Finding

mechanical fuel pump

windscreen wiper

starter motor

generator

brake

carburettor

clutch

Mechanical Fuel Pump

Symptom Cause Remedy
Pump leaking at mating face

Screw loose

Diaphram punctured

Tightens screws

Replace diaphram

Pump leaking at rivets Diaphram strained through bad assembly Replace diaphram
Diaphram material porous Diaphram material damaged by solvent substance in fuel Replace diaphram
Excessive pump stroke causing overstraing of diaphram Pump incorrectly installed , gasket too thin

Install correctly

Check stroke of pushrod, check diaphram

Pump pressure too low

Pump incorrectly installed , gasket too thick

Spring pressure too low

Install correctly,check pump stroke

Replace spring or stretch individual coils apart

Pump pressure excessive causing high float level

Pump incorrectly installed, gasket too thin

Diaphram spring pressure excessive

Install pump correctly,check stroke

Replace spring or bring coils closer together

Fuel pump inoperative insufficient fuel delivery Valves deficient or sticking Replace top half of pump