Re: fuel lift pump problems
The filter is near the left frame rail near the middle of the leaf spring. It looks like a sausage, literally. I is about 8 inches long, and about 2 inches in diameter. I have 3 of these model F650's in my city's fleet I take care of, and all 3 had the fuel tanks replaced under warranty at about the mileage you are at for defective, rusty tanks.
All of ours got so stopped up with rust they stopped running and had to be towed to Ford to be replaced. But if you have rust issues, changing the "sausage" pre-filter will help it run, and it will be completely full of rust. The retaining clips are easy to break, and hard to get, so go easy on them when changing the filter. Hope this helps.
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