I have a 1990 motor home built on a 350 chassis. 7.5 engine. It sat for 10 months and when I took it out, it starved for fuel. Thought it was the fuel filter, changed it roadside, and it started. Only made another 10 miles and it happened again.
When I broke the line at the filter, I couldn't get any pressure from the pump. Finally after much banging and priming I was able to get it running again and home. Still not running right, and I don't know what finally happened other than I banged on the tank, and topped it off with 3 gallons of gas.
Thanx
Ron

sounds like the pump is weak or picking up debris. by sitting for 10 months the gas could have gelled. I would check Fuel pressure and a new F.pump and strainer.