We had a fuel pump fail on a coach we bought that was older and had sat for a few years. Low miles. Our second trip we experienced it stalling out and stopping on the highway. We eventually limped off the highway and got some help. The mechanic said it was the fuel pump and that once the pump cooled down we could drive it for a few miles. Since it was over the weekend, we were able to drive it 12 miles to a campground. The mechanic ordered parts and we returned to him on Monday and he replaced the fuel pump and fuel filter since they were both in the fuel tank. They had to drop the drivetrain, so we asked them to dispose of the fuel left in the tank and put some fresh in it. This was all caused by the coach sitting for years with untreated fuel. For years after our trip where we took it to Alaska, we stored it for 11 months out of the year. We put Seafoam in the tank going into storage every year.
Never another problem and I am still driving the same coach 10 years later.
Dale