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Home >> Pontiac >> 1966 >> GTO Eng CD WS, Not Available Trans >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Mechanical Fuel Pumps >> Testing Vacuum Pump >> High Oil Consumption
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High Oil Consumption

NOTE: Piston type vacuum pumps require some oil for piston and cylinder wall lubrication and oil traces do not indicate a defective pump. Sudden increase in oil consumption may indicate a defective pump.

To test for excessive oil consumption, install a 2" glass blown type fuel filter (with filter element removed) in vacuum pump outlet line. An accumulation of 1/4" of oil in the bowl after 25 miles of operation indicates a defective pump.

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