The design of our 8KW Onan Generator makes it difficult to impossible to view the amount of antifreeze in the overflow tank when cold. Because I couldn't ever remember seeing antifreeze in it at all, I decided to add some (a cup or so) until I could see it in the tank. After a day or so I noticed a puddle of antifreeze under the generator and knew then that the tank had been empty since purchased on day 1.
Cummins Fort Worth replaced the Overflow Tank today and stated the tank was cracked at the hose connection because the hose clamp was tightened too tight. The $101.20 Overflow Tank and $328.60 labor to replace it was covered under Cummins/Onan warranty.
According to Buddy Gregg, they see a lot of these and it's a common problem with the plastic tank. According to Cummins Fort Worth they only had one tank in stock and stated they haven't seen many issues with this.
Anyone else had this problem? Can you see fluid easily in your overflow tank when the generator is cold and the fluid is at its lowest point?