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Old 03-05-2015, 05:44   #1
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Join Date: Jan 2013
Location: Apostle Islands, Lake Superior; St. Paul
Boat: Rhodes, Chesapeake, 32
Posts: 155
Oil pressure gauge intermittent readings

I have all new wiring, sensor and gauge on my 1961 graymarine seascout for oil pressure. My gauge only either reds 40psi or zero. I've tested the new gauge, it's fine.

My sensor would not fit directly on the engine due to the tight spot so I ran poly hosing about 18inches to the sensor. The sensor is still grounded with a terminal end on the threads where this wire then grounds to engine negative bus bar.

You can see the oil retract down the poly line when the engine is not in use. I've bleaded the line of air, oil still retracts down.

What's wrong?

Poly a bad idea?

Should I get nipples and fittings to make awkward hard connection of sensor to engine?

Old gauge ran oil mechanically through gauge and several feet of oil pressure lines.


Christian Gould
St. Paul, MN
S/V Sea Dog
Apostle Islands Lake Superior
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Old 03-05-2015, 07:38   #2
cat herder, extreme blacksheep

Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 18,967
Images: 56
Re: Oil pressure gauge intermittent readings

make sure there is NO air in the tubing.. hook it up with oil flowing out of it. i had this problem. if this doesnt work, new sender. last resort is new sender as it is probably fine.
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