SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: 76spectra18 on August 24, 2019, 07:23:21 pm

Title: Oil pressure gauge
Post by: 76spectra18 on August 24, 2019, 07:23:21 pm
My oil pressure gauge has been pegged at 80 psi. I put a new oil sender in and its still pegged at 80. When i disconnect the wire from the sender it drops to 0, but as soon as i reconnect or ground the wire it pegs out. What else should i look for?
Title: Re: Oil pressure gauge
Post by: GT Jets on August 25, 2019, 05:34:12 pm
What gauge and what does the sender look like?

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Title: Re: Oil pressure gauge
Post by: perryb on August 25, 2019, 06:57:31 pm
Somewhere between the gauge and sender, that wire is shorted directly to ground.
Title: Re: Oil pressure gauge
Post by: 76spectra18 on August 25, 2019, 07:40:27 pm
Its a faria gauge [attach=2]
Title: Re: Oil pressure gauge
Post by: 76spectra18 on August 25, 2019, 07:43:31 pm
If its a short between the gauge and sender what exactly does that mean? A broken wire? I hate electrical  :banghead:
Title: Re: Oil pressure gauge
Post by: GT Jets on August 25, 2019, 10:02:44 pm
If its a short between the gauge and sender what exactly does that mean? A broken wire? I hate electrical  :banghead:
Grab a length of wire and run it from the sender to the gauge bypassing the existing wire.

Sounds like the existing wire is pinched or shorted to another wire.

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Title: Re: Oil pressure gauge
Post by: Tikotiko on August 26, 2019, 06:17:20 am
Mine does the same and everyone has told me its normal but i havent bypassed the old wire. Probably going to try that today

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Title: Re: Oil pressure gauge
Post by: 76spectra18 on August 26, 2019, 09:05:08 am
Ok ill try that. Thanks for the advice
Title: Re: Oil pressure gauge
Post by: 76spectra18 on September 07, 2019, 07:12:12 pm
Ok, so i was finally able to test the wire like you said. Disconnected the sender from the gauge and ran a new length of wire straight from the sender to the gauge. As soon as i touch the wire to the sender it still pegs to 80. :banghead: :mad: what the hell esle could it be. Bad gauge? A friend of mine said it the gauge and sender have to be compatible? Any more idea from anyone?
Title: Re: Oil pressure gauge
Post by: Flusher on September 08, 2019, 11:08:04 pm
Is this a new problem that recently manifested itself or an existing condition?

Did the gauge ever indicate correctly?

Is this a new engine/oil pump combination?  Do you know if you have a high-volume/high-pressure oil pump?

Does the oil pressure drop when the engine gets to operating temperature?

Do you have a trusted mechanical gauge that you could temporarily install to verify your actual oil pressure?
Title: Re: Oil pressure gauge
Post by: 76spectra18 on September 09, 2019, 12:38:42 pm
No it hasn't worked since i bought the boat. I had the motor apart last year and it looks like its all stock 454 chevy.  All the other gauges are working fine. Is it that big a deal to run with no oil gauge.  At least my water temp is good.
Title: Re: Oil pressure gauge
Post by: Flusher on September 09, 2019, 05:49:41 pm
In my opinion, the only two important gauges are oil pressure and oil temperature.  Everything else is just ballast..
Title: Re: Oil pressure gauge
Post by: btnhtillidie on October 02, 2019, 06:16:17 pm
Is the 12v switched, piggy backed off another gauge?


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Title: Oil pressure gauge
Post by: K-034 on October 02, 2019, 07:33:30 pm
Is the 12v switched, piggy backed off another gauge?


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Yes. Signal wire works off of a resistance from the ground, if your gauge pegs as soon as the ignition is turned on then the signal wire is grounded out. That’s also how you test to see if the gauge is good, you just put the signal wire to ground, if it pegs then the gauge works. Water temp, Oil temp, fuel PSI, Oil PSI, etc..... all work the same way if there electronic


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