Author Topic: 99 Cummins 300 oil pressure guage  (Read 311 times)

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Offline wvabeer

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99 Cummins 300 oil pressure guage
« on: August 19, 2017, 04:23:16 AM »
I just purchased a Newmar 300 Cummins on a Spartan chassis. The problem is the oil pressure gauge, it seems to run a around middle 40's then it jumps instantly to pegged then maybe down a little but never below 42. Any ideas???

Offline LJ2654

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Re: 99 Cummins 300 oil pressure guage
« Reply #1 on: August 19, 2017, 08:58:30 AM »
I know that on a gas engine that a pressure relief valve can cause an issue like this, but not sure on a diesel motor.

Offline ziggyh

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Re: 99 Cummins 300 oil pressure guage
« Reply #2 on: August 20, 2017, 05:33:32 AM »
I would put on a mechanical guage and monitor the oil pressure to see if it's a guage or electrical problem or if it is a sticky regulator in the oil pump.
ZiggyH

2007 Revolution LE
C9

Offline wvabeer

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Re: 99 Cummins 300 oil pressure guage
« Reply #3 on: August 22, 2017, 07:47:07 AM »
I would think if the sender was erratic there would be a check engine light or some other alert.

Offline antiqueclockservice

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Re: 99 Cummins 300 oil pressure guage
« Reply #4 on: September 06, 2017, 01:45:20 PM »
I think you might better call Cummins tech support at  1-800-DIESELS
Best,
Phil

Offline wvabeer

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Re: 99 Cummins 300 oil pressure guage
« Reply #5 on: September 11, 2017, 03:16:54 AM »
I notice after the gauges do the dance the oil gauge stays at 40 before I start.

Offline Brett Wolfe

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Re: 99 Cummins 300 oil pressure guage
« Reply #6 on: September 11, 2017, 06:12:07 AM »
I suspect the dash oil pressure gauge is a Spartan part, and may not even use a Cummins sender.

I would contact Spartan with your VIN and ask them how to diagnose a bad sender vs bad gauge.

Offline wvabeer

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Re: 99 Cummins 300 oil pressure guage
« Reply #7 on: September 12, 2017, 12:02:37 PM »
Spartan says it could be a Demux box, gauge or the connections. I'm looking into it.