I to had a 86 f250, but with the ford ( cat) engine. I expericed what
you said many times. Mine would last for several miles until the fuel
ran out on that tank, I talked to several older and wiser diesel
mech's and we came to the conclusion that the fuel was foaming or
getting air mixed in with it. I often wondered if you could do the
same thing with a aqurium air pump and control valve and add air to
the fuel at the input to the injector pump and if this would help with
power and fuel ecomany.
david B.