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How to Prime a Harley Oil Pump Replacement Harley oil pumps must be primed after installation but before their first use in order to prevent “air lock” or cavitation. Essentially, air trapped inside the pump while it was out of the crankcase prevents oil from flowing and the engine quickly goes dry. It is a mistake one rarely makes twice since the engine may practically explode within a few hundred yards of leaving the garage on the first test ride. Oil pump manufacturers including S&S, Harley-Davidson and Sifton dryly note that substantial engine damage not covered under warranty may result from failing to prime an oil pump.

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