William,

Due to the age of the lift, the tank will need inspection to ensure no contamination gets into the fuel line. Makes sure the bottom of the tank does not have holes. If it was empty when you purchased the lift, could have had some problems in the system. Normally, when a lift has dual fuel option, one is hardly used. Unless you will have problems getting LP, I would not try to get the gasoline side working. If gas is cheaper, go for it. Need serial number to see what was installed. Good Luck.