CESMITH
1986F250 6.9
93 with ATS turbo I just changed all return lines and Orings on the injectors. truck had ben setting for afew weeks acted as if it ran out of fuel so ichanged the filter and filed the tanks with fuel. now it spits and sputers at a idle and seems ok above an idle it seems as if it is geting air in line could the lift pump be going bad it has 20000 miles on it and some biodiesel through it. the very reasion I had to change the return lines. i thought i would throw this out and see what you thought. thanks CESmith