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 Posted: 07-05-2019 06:58 pm
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Esprit2

 

Joined: 05-01-2005
Location: Minneapolis, Minnesota USA
Posts: 575
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 Your schematic shows the electric pump's output 'T-ing' into the hose from the engine's pump to the oil cooler. Nothing stops the oil from flowing both ways, and any oil that back-flows through the engine's pump just goes straight back to the sump without pressurizing the oil gallery and bearings.

The engine pump's clearances are tight, and it's not like there would be un-impeded back-flow. But whatever back-flow there is will detract from the electric pump's effectiveness at pressurizing the bearings.

Try it as it is to start with. But if it appears that you're losing pressure somewhere, try adding a one-way valve between the engine's pump and the T-fitting where the electric pump joins in. Make it a large enough one-way valve that it doesn't restrict the engine pump's normal circulation.

Regards,
Tim Engel

Last edited on 07-05-2019 07:46 pm by Esprit2