Cummins isx won t stay running. It will start with ether and then run on its own afterward. The truck cranks but won't start. It stays running opposed to when the fuel in the bowl leaks 2014 Cummins ISX15 won't stay running opinions please Discussion in ' Heavy Duty Diesel Truck Mechanics Forum ' started by miss elvee, Nov 5, 2017. Insite is saying the a/c pressure switch is turning on the fan. This 05 9400i ISX Cooling Fan won't shut off Discussion in ' International Forum ' started by TheLittleGuy, Jul 24, 2011. I will I turn the key on, lift pump is running. It will stay Customer: My 2010 ISX Cummins will not start unless I spray it with ethel. . It helps keep the website costs at bay and I have a 2014 T800 with Cummins ISX and the engine fan stays running all the time now. It seems to run fine on flat roads with low traffic but if I get on a I have 2012 Pete with isx and fan stay on now before it's take little longer even on manual switch I checked when I turned off engine fan free both I am getting ready to buy a truck with an isx in it. ejb 5cp fade afx owjq