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batman69's avatar
batman69
Explorer
Jun 10, 2020

fluxuating oil pressure gage

Turn on key to start engine. Oil pressure gage bounces from 20 to 40 and back....alarm comes on and chk eng light comes on....can start engine and runs fine......disconnected oil sending unit. Same symptoms.. 2003 Dutch Star...Cummins 350 ISC on Spartan Mountain Master Chassis.....ordered new gage thought was only thing left....plugged in new gage same story.....am hearing eng may have 2 sensors for the oil....can't find but 1.....Called Spartan. They said had heard of such a thing....Talked to Cummins said on had 1 oil sensor listed....Help and Thanks.....
Class A
  • Bikeboy57's avatar
    Bikeboy57
    Explorer
    Jun 22, 2020
    Can you clarify if the gauge fluctuates with key on engine off? And key on engine on?

    The fact that it fluctuates with sender disconnected has me checking the ground on the gauge. Run a new ground wire to a chassis point and see if that changes the behavior.

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