billbounder wrote: Hey Gunny and all you genset gurus...having an issue with MY onan emerald 5500 in my '99 bounder. when it wouldn't run, all checks found a dry-rotted flexable fuel line between the pump and the rigid line on the chassis (it was just sucking air thru a cracked hose). syphoned back up to pump and primed the line from the carb down to the pump and was back in business for another season. now thw same problem again...no fuel in the line. when I try to siphon fuel up thru the line to the pump, I can hear it sucking air up in the area over the coach fuel tank. I can see thru a hole in the chassis that a small length of flex fuel hose runs from the rigid line on the chassis over to the top of the main tank presumably to a fitting on the tank top. I can only assume that this hose is dried and cracked as well, wouldn't you think ?? genset runs if fed fuel at the carb. pump has been bench-checked good. coach tank is 3/4 full and level. must I get a dealer to drop my tank to replace a lousey 18" hose ?? I know what happens when you ASSUME, but do you think I'm barking up the wrong tree ?? thanks for any discussion I might get. billbounder
Pretty unlikely to have a hose only a year or so old be dry rotted.
Might be a loose hose connection.
A few hours to change out a fuel pump? Shoot, I could drive to Charlotte, sit at the Onan distributors parts counter for a while, drink a cup of coffee, shoot the breeze with the guys there for a while, come back and put a fuel pump in, test run it for a half an hour, all in less than 3 hours.
Billbounder
Most RV genset fuel installations contain two flex hoses in them. One at the top of the tank that may or may not have a 90 degree bend in it and one coming into the generator compartment and going to the fuel pump.
Yes the tank probably has to come out. Run the coach until the tank is down to less than 1/4 then pull the tank and change the line along with any other flex line up there. Use high quality silicone hose for replacement.
As an alternative. I had some enterprising Canadians come into the shop a few years ago and they had a super fix for the same problem. The tank on their coach was in the back of the frame and under the bed. They CAREFULLY measured and cut a hole in the floor under the bed and used it as an access hole to repair all the hoses in the area.
I had two problems with their fix:
1. It took business away from my shop after I had bought two special tank jacks.
2. It was logical and I didn't think of it first.
If you want to use their fix. Measure at least three times, get someone else to measure. Have a third person do the cutting (someone else to blame).
JimL
Jim & Jane Latour
08 Chevy 3500HD, crew cab, dually, Duramax/Allison
05 Wilderness Advantage AX6 365 BSQS, Onan 3.6KY
Retired AF CMS (E9) Power Generation and Onan RV genset Level III tech
Grand Strand Sams
Blog.rv.net
JimL wrote: If you want to use their fix. Measure at least three times, get someone else to measure. Have a third person do the cutting (someone else to blame).
I have a rebuilt 6.5 Onan Emerald III. It will not keep running until the governor retracts (it retracts after 2 or 3 attempts to start it) then it will keep running. Also will not respond to load by increasing the RPMs. The breakers will blow when A/C is turned on. Anyone have any suggestions as to what I should try? Has anyone seen a manual for this genset that I can download or purchase?
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