I had that happen one time with a truck I put an engine in. It was warm when it came into the shop (not heated) and when I tried to start it a couple weeks later with ambient temps of about zero.....it wouldn't start.
The pump ran but I had no fuel in the fuel bowl. It turns out that the gas cap wouldn't vent and when the fuel cooled in the tank, it sucked the fuel out of the fuel line, back through the pump, and filled the fuel line with air that the pump wouldn't purge out.
I won't get bit by that again.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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