MY DRIVEWAY IS VERY SLOPED, THE GAS DRAINS BACK TO THE TANK
HOW TO PREVENT THE GAS FROM RUNNING BACK TO THE TANK
DURING OVERNIGHT INCLINATED/SLOPED PARKING, ON BOTH MY
CLASSICS BUICK REGAL 1979 301, CHEVROLET IMPALA 1979 350 CID
Back into the driveway.
Try a check valve in the line. Those older cars only have one line from the gas tank to the carb so there is no decision on which line to install it on. You could also add an electric fuel pump...turn on the pump, fill the line then start the car.
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