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Diesel fuel expands and contracts with temperature variations. A full tank of warm fuel that cools overnight will pull a vacuum. More fuel and with a wider temperature differential will pull the most vacuum.
Likewise, warming a cold tank of fuel will create pressure. Spring & fall produce the largest swings in temperature.
I had a fuel cap on a 1994 6.5TD once that would cause the injector fuel return hoses to leak fuel about mid afternoon - after sitting in the garage all day.
Jim
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