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Assuming you are sitting in the garage or driveway running it up for break in, are you getting enough airflow over everything? You could be heat soaking everything under the hood and boiling the fuel.




Last night during my sleep, I thought of this very thing.
It was 94 degrees during the break-in. The car does not have a fan shroud. The helper fan I had wasn't very big. The clear fuel filter showed bubbling as the guage reading was falling.
I might try rerouting the line from the pump to the carb. Mine is run in a path similar to stock. It runs up from the pump between the alternator bracket and water pump housing, between the distributor cap and water pump housing then into the filter.
Does anyone ever slip a rubber hose over their steel line to reduce heat soak?