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Generators & Electric Motors General Discussion

Propane Odor after shutdown


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Old 11-05-2018, 04:29:39 PM
toddbailey toddbailey is offline
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Question Propane Odor after shutdown

Hey,
I have a kohler gen that was converted to propane before I purchased it.
Recently I noticed a faint and brief propane odor right after shutdown.
Can't say if this occurs during running
Is this normal or should I be concerned and thinking about a rebuild ?
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Old 11-05-2018, 04:50:24 PM
drumfield drumfield is offline
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Default Re: Propane Odor after shutdown

There is a possibility that there is residual propane in the hose between the regulator and the carb, and you are smelling that. However, it would be a good idea to test ALL joints in the plumbing with soapy water, all the way to the tank, to try and eliminate leak possibilities.
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Old 11-05-2018, 08:45:27 PM
Zeromedic Zeromedic is offline
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Default Re: Propane Odor after shutdown

Hi Todd,

If you are shutting the generator down by switching off the ignition,
then the propane smell is to be expected. As the engine coasts down
it still pulls fuel thru, and out the exhaust without getting burned.

Simplest fix is to shut down by closing fuel valve.

Steve
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Old 11-06-2018, 02:38:26 PM
Andrew Mackey Andrew Mackey is online now
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Exclamation Re: Propane Odor after shutdown

Ideally, you should have a fuel solenoid between the regulator and the carburetor. This will activate and open when the ignition comes on line, and will shut off when the engine shuts down. This way, fuel is not wasted or lost when the unit is winding down. NOTE: If fuel is being drawn into the engine after a hard run and a quick shut down, the excess fuel can be ignited by a hot exhaust part or by carbon in the combustion chamber. The result - a LOUD after fire! BOOM!!!

The other reason for the smell might be a demand regulator going bad - allowing gas to escape after shut off. It also may have some 'propane 'oil' in it, making action sluggish. Propane is a manufactured gas and has some oily residue (vapor) in it that can settle out in the regulation system. If you have old propane tanks, this oil can settle to the bottom of the tank and is stirred back into solution in the liquid propane introduced during refill.
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Old 11-09-2018, 11:00:59 PM
Arkie Arkie is offline
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Default Re: Propane Odor after shutdown

Quote:
Originally Posted by toddbailey View Post
Hey,
I have a kohler gen that was converted to propane before I purchased it.
Recently I noticed a faint and brief propane odor right after shutdown.
Can't say if this occurs during running
Is this normal or should I be concerned and thinking about a rebuild ?

So only smell it for short period of time after shutdown.

Probably unconsumed fuel during shutdown. (but do a leak check using soap and water)
Disconnect the load and then turn off the fuel supply while it's running so as all fuel is consumed when the engines dies and see if you get any odor.

Let us know what you find? (when doing these tests)
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