The weather is warming up and I’m anxious to start driving the bus again. Since the last trip prior to winter ended with stalling I put the bus up on ramps and investigated the problem. Based on the behavior I had suspected fueling problems. I checked the fuel pump and it was OK (though it’s 30years old so I’ll likely replace soon anyways), and also replaced the fuel filter. The old fuel filter was full of rust particles but it wasn’t really restricting the flow. A clue came about during replacement of the filter when I forgot to crimp the fuel hose upstream of the filter. Normally this would mean a shower of gasoline but there were only a few drips, indicating a clog upstream of the filter. I pulled the hose fitting off of the bottom of the tank and found it almost completely clogged. I had cleaned the tank when I had it out for repainting but it doesn’t take much to cause a clog. Now that it’s being driven the gas is sloshing and continuing to clean it out further. I’d expect the worst of the gunk has passed through by now but I’ll have to check this fitting periodically.
