Priming oil pump on reman

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dwonzer

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I have a 2003 Expedition with the 4.6. I just put a reman in it and am ready to fire it up. I am having trouble with the oil pressure. I put a new pressure sensor in, pumped oil into the oil filter adapter, and filled the oil filter before installing it. I unplugged the crankshaft position sensor so it won’t start when I crank it over. I crank it for about 25 seconds and then give the starter about 2 minutes to cool down. I’ve done this multiple times and the oil pressure gauge on the dash still doesn’t register any pressure and the dummy light still says low oil pressure. Anyone have any thoughts? I don’t want to fire it up without knowing I am good on oil pressure.
 

Hamfisted

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Have you inspected the harness and oil pressure sensor plug for damage, and that the sensor is in fact plugged in ? Is it a new oil pressure sensor? No blockage in it's orifice ?
 

Fastcar

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Plumb a mechanical gauge into an oil galley and run it up to where you can see it when your cranking it over.
 

SafariGoneWrong

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Start it. In 2017 I replaced the OEM oil pump with a Melling M360 (along with phasers, chains, guides, tensionsers, followers and lash adjusters). Did lots of cranking and never got pressure. Had to cross the fingers and it was only a few seconds after engine start it got pressure. I've seen over the years I'm not the only one that's done this.

You can also try this https://www.youtube.com/watch?v=a7hNQbdbiBY
 
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