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Open Roads Forum  >  Tech Issues

 > 5500 Onan starts then dies, help please

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RV-1/2n-FUN

FL.

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Posted: 11/11/21 07:03pm Link  |  Quote  |  Print  |  Notify Moderator

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

dougrainer

Carrolton, Texas

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Posted: 11/11/21 07:55pm Link  |  Quote  |  Print  |  Notify Moderator

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

RV-1/2n-FUN

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Posted: 11/12/21 01:22am Link  |  Quote  |  Print  |  Notify Moderator

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 [emoticon]

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

A1B00902

Vancouver B.C CANADA

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Posted: 11/12/21 10:56am Link  |  Quote  |  Print  |  Notify Moderator

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





dougrainer

Carrolton, Texas

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Posted: 11/12/21 02:12pm Link  |  Quote  |  Print  |  Notify Moderator

A1B00902 wrote:

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


True, but holding the choke butterfly would not override the oil pressure LOPKO. Doug

Dirtclods

Newport Beach

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Posted: 11/12/21 02:36pm Link  |  Quote  |  Print  |  Notify Moderator

Seafoam is a fuel treatment it doesn't work well after a problem exist. You gotta have in the tank and if your running lower octane fuels you'll get more **** built up in the carb.

Fisherman

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Posted: 11/12/21 03:44pm Link  |  Quote  |  Print  |  Notify Moderator

Octane has absolutely no effect on the amount of crud building up in a fuel system.

wa8yxm

Davison Michigan (East of Flint)

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Posted: 11/12/21 04:33pm Link  |  Quote  |  Print  |  Notify Moderator

You sprayed seafoam into the throat of the Carb.
But from your description I'd say it needs carb cleaned.
it is SLIGHTLY possible that adding seafoam to the tank might help
But I think Disassembly and cleaning is in order.

NOTE: This is not the only possible issue.


Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times


RV-1/2n-FUN

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Posted: 11/12/21 04:42pm Link  |  Quote  |  Print  |  Notify Moderator

Broke down the carb today and the inside looked as clean as the day it was assembled. Didn't have any cleaner so put Seafoam through everything then reassembled and WHAM-BAM it ran but only for 5 minutes.

Same as before r.e.-shutting down, so held butterfly and it ran great.

THANKS for the replies.

* This post was edited 11/24/21 05:26am by RV-1/2n-FUN *

RV-1/2n-FUN

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Posted: 11/24/21 05:30am Link  |  Quote  |  Print  |  Notify Moderator

Generator starts better than before then only runs for 4 minutes and dies. Checked pump with hose disconnected and pressure seems good so totally flustered and figure it's time for $$$$ and a pro.

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