Only questions that I can see...
Was the gasket installed between the oil pump and the block a red and
white intermeshed fiberous type, or was it more of a brown paper?
The red and white fiberous gasket is superior to the brown paper one
supplied by some gasket makers.
Did you use copper kote gasket cement on all surfaces before installing
the pump onto the block? Cover onto the pump?
Is by-pass ball, spring, and guide in place?
The pump draws a suction from the sump, up the suction pipe, through the
oil pan, through the block, then into the oil pump. Three gaskets are
involved in the sealing from the oil level to the pump. As things worked
before, we can assume that the seal from the pick up pipe to the oil pan
is OK, as is the pan gasket seal - oil pan to block. Any air leak can
affect the suction draw of the oil pump. As two were OK, and one was
replaced, it could be the block-pump gasket seal. Or, the pump-cover
non-gasketed surface seal.
Drain the oil from the sump, and pressure-lubricate the engine. Obtain a
Hudson type garden sprayer. Remove the oil line from the tee to the
gage, and install the hose from the pressure sprayer. Fill pressure
sprayer with oil amount required for your engine. Pressurise sprayer,
and left full amount fill engine. Restart engine, checking for oil
pressure. If low at first, let it run. Pressure lubrication should
protect engine during this stage. Pressure should rise to normal.
John Seim
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