It is not possible to answer the question without knowing the volume (quantity) of the gasoline. One gallon weighs from 5.8 to 6.5 pounds, depending on the temperature when you weigh it.
Water holds similar weight properties as gasoline, so you may wish to test this by weighing one gallon of hot water and one gallon of cold water and taking the average.
Don't measure, pour or heat gasoline!!
Gasoline wegihs 6.08 pounds per gallon, diesel weighs an average of 7.1 pounds per gallon, water weighs 10.0 pounds per gallon. I Taransport gasoline daily and have been for the past 14 years.