I have a vexing issue. My Onan 7.5 diesel generator stumbles, loses voltage (down near zero) and eventually shuts down when moving and especially going around corners. At first I thought it was the fuel filter/water seperator, then maybe I had shorted batteries, then maybe air conditioner problems but after further investigation, I get the same outcome with all appliances off,new batteries, and no load whatsoever. On the other hand it seems to run perfectly under a big load with the coach stationary. I initially drained the water seperator (maybe a 1/2 ounce) and found no sign of water. I was hesitant to drain more as it might make it hard to restart. The filter was brand new 10,000 miles and a year ago. I have a replacement fuel filter/seperator on order. Any ideas?
Have you checked the low oil safety shut off switch? If you are low on oil and are going around corners, the oil may slosh away from the switch and give a false reading? Just something else to check.
I had a similar problem. Turns out it was a low oil situation. When moving, the oil would often fall below the sensor and turn off automatically. If the oil went back over the sensor before the generator had stopped completely, it would continue to work but stall and provide low voltage until it came back up to speed.
Thanks for getting back to me. Yes, it has a seperate fuel filter/seperator. Beyond that I do not know how the fuel is plumbed. It restarts perfectly, like nothing ever happened. The lube oil is on full as is the diesel fuel. If I give up on self diagnosis how scared do I need to be of getting screwed if I take it to Cummins. I also have a Freightliner Oasis right next to Rocky Mountain Cummins.
* This post was
edited 07/21/11 03:38pm by DonBaja *
DON: This sounds like a sensor problem to me and will probably need to be dealt with by a professional. Rocky Mtn. Cummins has a pretty good reputation. . . give 'em a try. As always, oRV
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