When I had the old Prevost with the Detroit when I changed fuel filters, I filled them with fuel, 1 at a time. and it always started right up. When I serviced the M 11 Cummings I was careful , I filled filters with fuel 1 at a time and it had a hard time starting.<br/>It has a Baldwin water separator 1st and then the Cummings filter. I must of got air in the lines. Is...