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Old 12-15-2015, 03:59 PM   #11
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Location: Texas
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Year: 1997
Coachwork: AmTran
Chassis: Genesis
Engine: DT466
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A heads up that in recent years, WD-40 uses CO2 as its propellant to make it less burnable. They used to use butane (IIRC). Not sure how this affects the WD-40 trick, though.
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Old 12-15-2015, 07:43 PM   #12
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Year: 1995
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Chassis: All-American R/E
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Take the carb apart. That is most always the problem. Doubt it has anything to do with the gov. Pretty dead simple units.

Dont lose parts or rip gaskets. Stuff is getting scarce. If you do, you'll have to improvise.

What model is it?
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Old 12-15-2015, 08:47 PM   #13
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Year: 1975
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Engine: Cat 3208t/10 speed transmission
Check out the air intake all the way from the filter to the carb.
I have a similar Onan.
Last spring it ran like yours.
Acorns in the carb throat.
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Old 12-15-2015, 10:41 PM   #14
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carb rebuild should fixit.

gas that sits in carbs, turns to shellac in carbs
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Old 12-16-2015, 06:24 PM   #15
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There are relays in under the cover behind the ammeter. When you hold the "start" switch the engine will turn over. There is a relay that responds to oil pressure that keeps power to the ignition as long as there is pressure.

I seem to recall that there is also a delay relay that ignores no oil pressure for the first 30 seconds while the pressure builds. That might be on other models, it may depend on you holding the "start" switch.

Start it with the cover off of the relay box, and see if one of the relays releases just before the engine starts to die.

It may be as simple as a plugged or bad oil pressure switch.

Now that I think about this, if you hold the "start" switch continuously, does the starter crank forever, or does the oil pressure cause the relay to release the starter motor once it is running a bit?
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Old 12-16-2015, 07:03 PM   #16
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Quote:
Originally Posted by Redbear View Post
There are relays in under the cover behind the ammeter. When you hold the "start" switch the engine will turn over. There is a relay that responds to oil pressure that keeps power to the ignition as long as there is pressure.

I seem to recall that there is also a delay relay that ignores no oil pressure for the first 30 seconds while the pressure builds. That might be on other models, it may depend on you holding the "start" switch.

Start it with the cover off of the relay box, and see if one of the relays releases just before the engine starts to die.

It may be as simple as a plugged or bad oil pressure switch.

Now that I think about this, if you hold the "start" switch continuously, does the starter crank forever, or does the oil pressure cause the relay to release the starter motor once it is running a bit?

Interesting. It doesn't have a starter. It has an exciter starter??
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