Onan generator 5500

Another thing to look for is degradation of the rubber fuel lines. with the crappy ethanol in the fuel it eats at the rubber. My fuel station line between the tank and pump was toast due to this. I replaced the entire fuel line from tank to pump with 3/8 copper, short rubber hose on each end that is rated for the new fuel.

I understand some folks have had an issue with the generator-mounted fuel pump drawing from too great a distance. Mounting the fuel pump closer to the fuel tank has apparently made a difference.

Also, make sure your altitude adjustment is correct.

My rig has an Onan 5500 with solid door. No problems with shutdowns.

allcool wrote:

twbronco wrote:
It runs for awhile and then surges and shuts off. The red light then blinks three times

Start at the start... go into your owners manual and look up how to get trouble codes. Get the exact trouble code you have, come back here and tell us. We all will be able to help a lot more then.
More or less, everything else is just a guess. No guarantee the trouble code will be the tell all, but it is the place to start imo.

jmo

After shut down, the red light flashes 3 times. Push the button one more time and the "trouble code" will flash. example 1 flash, pause, 4 flashes = trouble code 14 etc.

Picked up my trailer. Seems to be fixed but only time will tell.

Good luck.

Report back with the results.

I contacted Keystone and they approved the vent. The are almost done so we will see. The dealer told me this is happening to a lot of new Onan 5500

lincster wrote:

twbronco wrote:
Update, the dealer said this model has issues with air flow. They are adding vents to the generator door.

Sorry, that ain't it.

Sounds like your dealer is just trying stuff.

Every Weekend Warrior I ever saw built with the Onan 5500 genny had a solid door and worked just fine.
The genny's pull air from the bottom, not the door.
There should be a totally open screen on the bottom.

I agree

Fuel flow or governor issues is my guess without more information. The safety may be shutting it down because it cannot maintain 60Hz.

lincster wrote:

twbronco wrote:
Update, the dealer said this model has issues with air flow. They are adding vents to the generator door.

Sorry, that ain't it.

Sounds like your dealer is just trying stuff.

Every Weekend Warrior I ever saw built with the Onan 5500 genny had a solid door and worked just fine.
The genny's pull air from the bottom, not the door.
There should be a totally open screen on the bottom.

I'm with Lincster on this one. Mine never overheats and the door is solid. It did shut down this summer but that was due to vapor lock, fixed that with a new 3/8" fuel line from tank to pump.