How much weight gain from adding a Dana and roll cage.

I run a stock tank and went from having to run almost 3/4 of a tank of fuel down to 3-4 gallons by running Holley Hydramat. As long as one corner of the mat touches fuel. It will not suck air. I have finished running for the weekend and left the car in the trailer for a week and it won’t start. The fuel SLOWLY drains out of the mat over days. Shake the car and vroom! As long as the fuel gauge moves the slightest bit, I can make a run no issues.

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