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I did not see an open thread for dumb questions so I started my very own:

 

I'm aware that a new oil pump has to be primed by immersion out of the engine as it will not prime itself.  Ok, I can live with that.

 

The question:  If an engine is assembled with the primed pump will it lose the prime if it sits?  

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I think the answer depends on the time lapse between installing a primed pump and first use.  a few hours, maybe not, a few years, probably.

 

 

In my case, I've always filled pumps with Vaseline before installation.

 

I used to work on a lot of the little 215 V8 Buicks.  Their pump is in the front cover and a long way from the pickup.  The manual recommendation was to pack with Vaseline.  Seemed like a good idea, so I adopted it for all.  In addition, back in the same time period 60s-early 70s I built a lot of engines for my Dad's business.  They would sit in inventory for weeks, and be installed by the customer.  The packed pump was good insurance against startup damage.

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