Our 2006 FEH which according to FORD has a 57 litre capacity will not accept more than 41.xx litres. The tank reads 3/4 full. Ford wanted to replace the fuel sending unit and pump. We are quite sure the float moves and registers accurately when moved. If you move the arm it will register full at the upper limit and a careful slow filling of an empty tank indicated 0, 1/4, 1/2, and 3/4 accurately. At this point we suspect something is preventing the tank from filling and the tank gage is accurately registering its contents. Any suggestions on what might be the cause of it stopping at less than full. Some discussions have been around an air lock or a "roll over valve" that might be malfunctioning. Comments? I have zero confidence in Ford Techs trouble shooting ability. Everything is remove and replace and anything electrical is not returnable. The real problem is the service writers and computer system are huge barriers between the customer and the techs doing the actual work.

Where is the roll over valve on the FEH? In the tank or the plumbing down to the tank?

Rocky