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 > Your search for posts made by 'lakecityemt' found 15 matches.

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RE: Onan 5500 Backfires and Dies under a load

Is it still working? Did you leave the arrestor plug out? We are out of town after testing it with out the plug, it will be a few weeks before I get back to the RV.
lakecityemt 08/18/19 05:58pm Tech Issues
RE: Onan 5500 Backfires and Dies under a load

That sure seems like a lot. I just measured mine. 13' from outlet on gas tank to inlet on gen on a 34' rv. Maybe they put the tanks under the toy hauler garage to be used to fill up the toys too? Yes mine has 2 tanks for gas, one for gen and one for toys. also 2 grays and a black, therefore i'm sure its a weight distribution issue.
lakecityemt 08/17/19 11:16am Tech Issues
RE: Onan 5500 Backfires and Dies under a load

Great thought, but instead of it pulling 35 feet from the tank its now pulling it less than 2 feet. Problem also happened with fresh gas from the tank. No, electric fuel pumps are placed inside tanks or below the tank especially in high performance applications Your pump would do better being level pulling 35' than trying to pull 2' from below. I doubt they would put a gas tank 35' away Why are you using a separate tank? This is how it is set up in my toyhauler. THe Genset is under the front bedroom, the tank is in the very back under the garage. 41 foot toyhauler. Unless there are 2 fuel pumps, we just replaced the one at the genset thinking that could be the problem. It was not. It now appears it was the spark arrestor.
lakecityemt 08/16/19 07:40pm Tech Issues
RE: Onan 5500 Backfires and Dies under a load

Great thought, but instead of it pulling 35 feet from the tank its now pulling it less than 2 feet. Problem also happened with fresh gas from the tank.
lakecityemt 08/16/19 07:01pm Tech Issues
RE: Onan 5500 Backfires and Dies under a load

For the past year I have been searching for answers and replacing parts with no improvement. What year is this toyhauler? Did it run right the previous year? Have you checked that it has proper gas flow from the tank? Have you tried loosening gas cap while running? 2013 Been trying to fix since it acted up 3 years ago... Dad visits once a year and tries to fix it while here... New fuel pump and we are not running from the tank, directly from a fresh gas can below the generator. Spark arrester removed and now it runs under a load.
lakecityemt 08/16/19 06:45pm Tech Issues
RE: Onan 5500 Backfires and Dies under a load

"I assume from the backfiring?" I can't see it or hear it run online. That said: Backfiring implies that unburned mixture IN THE INTAKE tract is being ignited and burned. (not the exhaust) Can you confirm that? Backfiring is a classic condition of a lean mixture which would point to a vacuum leak somewhere in the intake. Are all the breather hoses connected properly? Is the (new) carburetor properly seated on the manifold with all the gaskets? When hot, a lean mixture can lead to pre-ignition/detonation which may sound like a backfire. What happens if you manually force the choke on with the engine warmed up, loaded, and backfiring? (richen the mixture) Any improvement? Do you have a compression tester? If so, does the engine meet the compression specs? Chum lee Chum you might be a bit over my head, LOL... I will ask him to try and manually adjust the choke when its backfiring. No compression tester. OK let's try something simple. Your carburetor should have an altitude compensating adjustment screw. It has some control of your fuel mixture adjustment which should be set for your current altitude. It that set correctly? Having it set too high for your current altitude can create the symptoms you have. For example: If you are currently at 1500 feet altitude, adjust (turn) the screw so that the pointer is between 1,000 and 2,000 feet. Look at the screw adjustment on the carburetor, it will be obvious. Chum lee Hey Chum, The altitude adjustment is correct. We removed the plug and now it runs properly under a load!! Now what? LOL Can I leave it out? Probably not if its a spark arrestor
lakecityemt 08/16/19 06:42pm Tech Issues
RE: Onan 5500 Backfires and Dies under a load

When I had that happen to my onan,I found a broken valve spring. Worth a look. ( it had about 150 hours on it. Thanks, sadly not something we are capable of fixing
lakecityemt 08/15/19 08:53pm Tech Issues
RE: Onan 5500 Backfires and Dies under a load

"I assume from the backfiring?" I can't see it or hear it run online. That said: Backfiring implies that unburned mixture IN THE INTAKE tract is being ignited and burned. (not the exhaust) Can you confirm that? Backfiring is a classic condition of a lean mixture which would point to a vacuum leak somewhere in the intake. Are all the breather hoses connected properly? Is the (new) carburetor properly seated on the manifold with all the gaskets? When hot, a lean mixture can lead to pre-ignition/detonation which may sound like a backfire. What happens if you manually force the choke on with the engine warmed up, loaded, and backfiring? (richen the mixture) Any improvement? Do you have a compression tester? If so, does the engine meet the compression specs? Chum lee Chum you might be a bit over my head, LOL... I will ask him to try and manually adjust the choke when its backfiring. No compression tester.
lakecityemt 08/15/19 07:56pm Tech Issues
RE: Onan 5500 Backfires and Dies under a load

I will try that, if it will run under a load, that is the whole problem, LOL...
lakecityemt 08/15/19 07:53pm Tech Issues
RE: Onan 5500 Backfires and Dies under a load

He did remove a square plug, we will try that again with the new plug
lakecityemt 08/15/19 07:19pm Tech Issues
RE: Onan 5500 Backfires and Dies under a load

185 - My dad was not aware of their being a spark arrestor. In the visible portions none were found, its possible its in an area he could not see.
lakecityemt 08/15/19 07:00pm Tech Issues
RE: Onan 5500 Backfires and Dies under a load

Mexico - New fuel pump and filter, of course I could have faulty parts... again.... I'm thinking we have done as much as we can without a professional and help to remove the generator. I was hoping there could be an answer that was simple, but its not looking that way :(
lakecityemt 08/15/19 06:33pm Tech Issues
RE: Onan 5500 Backfires and Dies under a load

Choke is fully open when hot. Spark plug did have a black end, the end where the gap is but the porcelain looked brand new. The guy at the parts store said it looked like it was running hot... I question if its the spark plug wire... My dad is here trying to help fix it, well last summer and this summer and he says he thinks its running rich, there is some dark smoke from the tail pipe when it runs. He questions something in the tail pipe? Have to take it out of RV to disconnect the tail pipe from what he says.
lakecityemt 08/15/19 05:48pm Tech Issues
RE: Onan 5500 Backfires and Dies under a load

Thanks for the quick replies! So I have tried Seafoam per the instructions, no help. Checked altitude settings, its correct No cummins dealer here but if I ever put her back on the road system, I will take it to cummins if its not fixed by then... One spark plug was not firing properly, changed that and now it takes a small load (1 of 2 AC units) so thats an improvement!!! But not back to what it used to do!!
lakecityemt 08/15/19 03:49pm Tech Issues
Onan 5500 Backfires and Dies under a load

Good Morning.. Im hoping to find the Onan guru's that are here... For the past year I have been searching for answers and replacing parts with no improvement. I have an Onan 5500 with less than 100 hours in my toyhauler. It began backfiring and then dying when a load was placed on it. I have so far replaced the carb, fuel pump and filter, fresh gas directly from beneath the gen. Once it starts backfiring, if the load is stopped, it continues to "put put backfire" until it dies then gives an overheated exhaust code (I assume from the backfiring?). Plugs were replaced, now currently testing to see if there is spark to both plugs. Please someone help me solve this issue!!! I'm in BFE Alaska in a perm set up, there's no ONAN tech here so I'm on my own... Thanks for ideas and suggestions!! UPDATE: replaced one of the new spark plugs with another new (wasn't sparking well) and took out the plug in the exhaust, now it works great! Can I leave the plug out? Ive been told its the spark arrestor, sounds like an important part to me, HAHA. Could this mean there is a blockage in the tail pipe?
lakecityemt 08/15/19 01:59pm Tech Issues
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