Ford diesels in 85 were known for getting air-leaks in the little Schrader valve by the filters (looks like a tire air valve). Causes the system to get air-bound when parked for awhile.
GM 6.2s had a similar problem caused by a leaking check-valve in the retrurn line.
A leak in the rubber fuel return hoses on a 6.9 can do the same. Allows fuel to flow backwards.
I just hsd the same happen to my 85 F250 with a 6.9 but mine had all new hoses on it. The new hoses were absoolute junk and went bad in less then a year. I ordered some Viton hoses and now it's fine.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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