Well Dave kind of brought this question to light.Dual fuel-propane and gasoline.He was saying in his gasser thread the thought of using propane for his tow rig.I went to the Indian reservation to buy cigarettes which is about 40 miles away from Roch,NY.While there I got some gas and even there it was 3.70's per gallon.The propane was 2.59 a gallon.I have been concerned about the gas pricing and how it will effect my project 383 sbc Astro van which I am building as a tow van for my traveling business.

So I don't know anything about dual fuels like this.I would want to have the option of either propane or gas if I got to a area where I couldn't get a refill on propane.I have intended to use a TBI.

Does anyone build a system using a TBI??.How do they work??.Just for the sake of discussion,lets say I figured a way to get a 100lb tank mounted,what kind of gas mileage could I expect??.If propane burns hotter to create more torque,does it have a effect on the engine long term??.If I have to run a high compression engine to run propane,does that mean I have to run high test gas when I can't refill with propane and that fact would cancel any savings using propane??.

All these questions aside,I still need to know how dual fuel systems work.How is the propane introduced to the intake of a engine??.What does it take to make this conversion??.

Thanks