David, remember this is not a pump, but a metering device. The oil is under
pressure from the engine oil pump. Dave uses a special front cover that is
designed for the the metering (pump) device that has capability for the 3
lines needed for a 20B. It worked fine on my 20B.
Chuck Harbert

Not true Chuck. The oil injection pump draws from a reservoir formed in the 
front cover and the pump. No engine oil pressure is directly involved. The top of
the reservoir is open to atmospheric pressure. If Dave Atkins thinks that
he is wrong.

Paul Lamar
 
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