Oil & Fuel JD 318 stops running

[Sissybitus]

1987 JD 318 Onan Motor. Will run for 20 minutes, then just shuts down. Wait about 15 minutes and it starts up again and then does the same thing.

 

[RandyT]

When it shuts down have you checked for spark. maybe the coil is heat failing.

 

[Sissybitus]

When it shuts down have you checked for spark. maybe the coil is heat failing.

Thank you, I will check for that. I had thought it might be the new gas cap, it didn't have a vent, so I put on a vented cap, but haven't had a chance to test drive.

 

[Egon]

It may be related to a capacitor on the ignition circuit.

 

[CobyRupert]

All good guesses for symptoms.
- Coil
- Bad tank vent
- Fuel line either getting too hot (vapor lock) and/or
- Fuel line weak enough that it collapses and pinches itself (is this possible?) .