My genny is LP fueled and has no carb adjusments for altitude like some of the gasoline models do. I had to hold the throttle open slightly in order for the unit to fire and start. Once started in ran fine at idle and under load. Again, this condition was at around 8000 feet elevation.

I live in the midwest at around 800 feet elevation and have no problem starting the unit from either the remote start inside the camper or the start button on the genny.

I posted this on another site and received several replies. I've also just received the operators manual and a service manual and neither one is very clear on LP fueled units and altitude. Was just wondering if anyone here has had the same experience. One response from the other site thought that genny is running too rich. Wouldn't opening up the throttle create and even richer mixture? Maybe more air too, I don't know.

Model # 2.5KVD-2089A spec A

Air cleaner, oil and spark plug are new.

Thanks,

I read your post a month or so ago and was finally able to test mine out at 9200' at Meadow Lake in Idaho's Lemhi Mountains. I primed for 2 seconds as I normally do on a cold motor and hit the start button, it fired up and ran the same as it always has at lower elevations. Mainly I camp between 4000-7000 feet but i did go to the Oregon coast in August and it started and ran the same there as well.

I have the Onan 2500 LP in my AF as well, it has less than 10 hours on it currently which makes me ask how many hours are on yours? Having worked as a powersport mechanic (atv, snowmobile, motorcycle etc) I know that engines with low compression are hard to start especially when when cold. I would recommend doing a compression check to see where you stand and know that your compression decreases with altitude so if it is low at your 800' elevation it will be even lower at high altitude making it even that much harder to start.

My only other thought is that if you have to hold the throttle open slightly more to get it started it could be that the linkage is in need of adjustment, I haven't been in to mine yet to see how the idle speed is adjusted but I am sure there has to be a way. Set your idle screw up a bit which will give more fuel/air when starting, this is essentially what you were doing by holding the "throttle open slightly in order for the unit to fire and start".

Technically a carburated engine will run richer at altitude unless an adjustment is made. That is because the air density lessens with altitude and unless you decrease the fuel flow your fuel to air ratio becomes richer thereby causing problems if it becomes too rich. By opening the throttle more you are not changing the fuel to air ratio of the mixture you are only adding more of the same mixture. Having never worked on an LP system before I am unsure of how they mix and adjust fuel so I can't comment here, I can only say that mine seems to start and run the same from sea level up to 9200'.

I know this is a reply to an old posting so hopefully you have it figured out by now, if not hope this helps.