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Old 01-14-2019, 12:05 AM   #1
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Join Date: Jul 2018
Location: BC
Posts: 17
Default Onan 2800 Shuts Down After Start

Hi all,

Looking for some advice! My Onan Microlite 2800 (gas) starts then shuts down between 5-10 seconds.

- Purchased 1999 Islander with built in generator in September 2017
- Generator ran OK, but needed a tune up (hard to start after off for awhile, blows a bit of white smoke at start up, occasional surging)
- Changed oil (spilled a bit in the bottom of the case)
- This problem started immediately after changing the oil
- Changed the spark plug (old plug was covered in oil), issue still persisted
- Changed the air filter, no change
- Changed the fuel filter, set would not start at all
- Drained a bit of oil (from 7/8 to "1/8") as I read that the sensors on these sets can falsely read overfull, no change
- Next day tried again, started and shutoff again, would not start again
- Sprayed some carb cleaner in, started and shutoff again
- Now back to same issue, start and shuts off after 5-10 seconds

I am thinking its the oil pressure switch, but not sure if there is anything else I can try before the major project of pulling it out of the RV to service the sensor?


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Old 01-14-2019, 12:40 AM   #2
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Join Date: Dec 2015
Location: Arizona, Tempe
Posts: 399

There is no oil pressure switch. There is an oil level switch. I've never heard of an over full sensor. Just guessing but if it isn't too low oil it may be a failing fuel pump. Once the carb bowl empties, the engine quits.

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Old 01-14-2019, 12:54 AM   #3
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Join Date: Jul 2018
Location: BC
Posts: 17

Ha! Of course as soon as I post I sort it out. It was the oil sensor (whatever it senses). I disconnected it and it runs fine (aside from white smoke).
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