we have had a problem with our front tank fuel pump. Not working after a few months in hot conditions, Replaced three pumps in four years. New mechanics this time discovered a fine grit in the front tank. Looking further they discovered small cracks in the rubber fill line and vent line. What they think has been happening is that those small cracks allowed very fine road dust to get into the tank. We have flushed the tank replaced the lines and fuel pump time will tell but hope this solves the problem. Now a little background from what I have read the fuel system in this era of Ford E series were major pain in the @ss, They are very pressure sensitive meaning that the least bit of reduced pressure from the pump shuts the fuel system down. Some people have installed after market pumps and pressure regulators between the tank and the engine.
