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Home >> MG >> 1968 >> MGB Base, Not Available Trans >> Repair and Diagnosis >> Engine Mechanical >> Fuel System >> S.U. Hp & AUF 300, 301, 303, 306 Electric Fuel Pumps >> Trouble Shooting & Diagnosis >> Pump Operation Slow

Pump Operation Slow

This may be caused by an obstructed fuel supply to the inlet side of the pump. Disconnect the fuel line at the pump inlet. If the pump now operates at normal frequency (or faster), proceed as follows:

  1. With fuel line disconnected from pump, remove fuel tank filler cap. Use compressed air at pump end of fuel line. If air flow was poor at first but gradually or suddenly improved, obstruction has been cleared.
    CAUTION: Do not apply compressed air to fuel pump. Valves will be damaged.
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