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...with the good ol' straight six AND fuel injection (yes, they made a few that way) has had the same problem for years. IMPORTANT: If you have fuel injection, don't deal with the problem by running one tank completely empty, and then switching to the other one! There are supply pumps in the tanks which need the resistance of gasoline to keep from overheating. Many thousands of Ford owners burned out these pumps prematurely when the gauges became problematic by running on one tank until the truck started to stall, then switching to the other one. I, on the other hand, am still running all the original pumps after 175,000 miles. I've driven that truck for about seven years now, without gauges, just watching the odometer. I've never been stranded yet, although occasionally I accidentally run one tank out of gas. If I do, as soon as I can I throw a gallon or two of gas in the empty tank to protect the pump. I've always been told the problem was likely with the sending unit. I've also been told the tanks must be dropped to replace these, but I've never looked into it. I believe mechanicfred has given us the correct procedure for determing whether the problem is in the meter itself or in the sending unit; but frankly, it sounds pretty certain that your problem (and mine) ARE in the sending units.
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