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Old 11-20-2016, 09:16 PM   #17
cappy208's Avatar
City: Cape Cod
Country: USA
Vessel Name: Slip Aweigh
Vessel Model: Prairie 29
Join Date: Oct 2013
Posts: 1,202
Do you still have the old gauge? If so, install it down next to engine, using clean well connected wired directly to the sending unit. see if you get the same 'falling' readings. If you do, then pull the sender out and try to clean the nozzle end (the inside which would get the oil pushed up against it).

Think about it this way. The oil sender unit is at a dead end of a short pipe in the block. ANY oil having been pressured up doesn't 'go anywhere' to get flushed out. It is common to have oil 'gunk' collect on the grainy pressure sensitive ends of the senders and they get clogged. It's not like it gets a 'wash' of oil past it, which in turn gets filtered. I've taken several out over the years and it's like a dirty sludge covered oil nozzle. Short money on removing the sender, cleaning it with spray on brake fluid cleaner (or just swishing around in a cup of gas) and letting dry then reinstall.
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