Will this is what I did!
I pump out the tank and then I leveled the motor home and drained the sump dry, I then went back to the fuel water separator and blew the line out that went back to the tank, the drain plug was still out. I changed the fuel filter and the water separator filter, I put a 32oz bottle of power service in the tank and started to put fresh fuel back in until I had 20gal in it I started it and drove to the fuel station and filed up then I drove about 6 or 7 miles and no sign of any thing wrong. Since then I have not been able to drive it but I did start it 3 different times and let it run for a hour still seems to be all right.The 300 plus in fuel I gave to a friend with a oil furnace I thought the cost of the fuel and filters was better than a fuel pump or something else.I hope I am right.