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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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