Oil pressure sending unit

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   I replaced my oil pressure sending unit but the gauge still pegs all the way to the right when the boat is on. Your thoughts? Thanks

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marmon77 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: August-01-2010 Location: Dade City, Fl. Status: Offline Points: 112	Post Options Post Reply Quote marmon77 Report Post Thanks(0) Quote Reply Topic: Oil pressure sending unit Posted: May-04-2012 at 11:19pm
	I replaced my oil pressure sending unit but the gauge still pegs all the way to the right when the boat is on. Your thoughts? Thanks

Big t Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: April-26-2012 Location: Southern nh Status: Offline Points: 101	Post Options Post Reply Quote Big t Report Post Thanks(0) Quote Reply Posted: May-04-2012 at 11:58pm
	Mabie atheist sender wire is frayed and grounding some where between the sender and gage? You could temporarily add a cheep mechinacal gage to see what the pressure is.

OverMyHead Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: March-14-2008 Location: MN Status: Offline Points: 4861	Post Options Post Reply Quote OverMyHead Report Post Thanks(0) Quote Reply Posted: May-05-2012 at 12:05am
	Did you use anything like Teflon tape? I hear the unit needs direct electrical contact with the block.
	For thousands of years men have felt the irresistible urge to go to sea, and many of them died. Things got better after they invented boats. 1987 Ski Nautique

8122pbrainard Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045	Post Options Post Reply Quote 8122pbrainard Report Post Thanks(0) Quote Reply Posted: May-05-2012 at 9:30am
	Mark, Remove the gauge sender wire (at the sender itself is easiest) See if the gauge still pegs. If it does, then yes, the sender wire is shunted (shorted) to ground. If it doesn't, with the sender wire still disconnected, Ohm between the sender terminal and ground (engine block). If you get a near zero reading the sender itself has an internal shunt to ground. Replace it. (a battery powered test light will work too - if it lights up, then the sender is shunted) Teflon tape on the sender pipe threads may cause a open circuit because it may insulate the sender to the block. The block is the ground for the gauge. If this was the case, you wouldn't get any gauge reading. BTW, has anyone been doing any wiring on the back side of the dash?
	54 Atom 77 Tique 64 X55 Dunphy Keep it original, Pete <

marmon77 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: August-01-2010 Location: Dade City, Fl. Status: Offline Points: 112	Post Options Post Reply Quote marmon77 Report Post Thanks(0) Quote Reply Posted: May-06-2012 at 5:14pm
	No teflon tap on gauge going to block, and I haven't been messing with the wiring behind the dash, so I'll remove the wire and test it that way. The sender is new so I wouldn't think it would be bad buuuut you never know. Thanks!

8122pbrainard Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045	Post Options Post Reply Quote 8122pbrainard Report Post Thanks(0) Quote Reply Posted: May-06-2012 at 5:34pm
	Mark, What testing did you do that indicated to you the sender was bad requiring it's replacement?
	54 Atom 77 Tique 64 X55 Dunphy Keep it original, Pete <

Oil pressure sending unit

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