5500 Onan starts then dies, help please

[RV-1_2n-FUN]

2008 Onan 5500 that I neglected and did not run every month with load since May. Using start switch on the generator, first priming then start the gen. It starts and runs ONLY as long as I hold almost completely closed the butterfly under air filter. If I take pressure off the B-fly opens wide and sounds like gulping air then shuts down with code flashing 36. Reset code, prime and start up and again runs only by holding closed the butterfly. Sprayed plenty of Seafoam in to no avail.

Any ideas of problem???

TIA

[A1B00902]

check the oil level, Onan will not run if low on oil

[RV-1_2n-FUN]

dougrainer wrote:
The seafoam did not work. You need to remove the carb fuel bowl and unscrew the needle jet assbly and clean out the 16 holes with regular carb spray. The carb is varnished/gummed up. Doug

Thanks 🙂

Will put your suggestion on today's "must do" list.

[dougrainer]

The seafoam did not work. You need to remove the carb fuel bowl and unscrew the needle jet assbly and clean out the 16 holes with regular carb spray. The carb is varnished/gummed up. Doug