How to Convert a Gasoline Engine to Run on Propane
Converting a gasoline engine to run on propane can reduce or entirely eliminate the need to purchase gasoline. The conversion works best on a car equipped with a carburetor, as the metering of the fuel does not require reworking the injection system. The average backyard mechanic can convert a car to run on propane in about a day.
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Things You'll Need
- Socket set
- Screwdrivers
- Propane tank
- High-pressure propane valve
- Propane lines
- Throttle injection ring
Instructions
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1
Install the propane tank by mounting a new propane cylinder in a convenient location on the vehicle. The laws in most states require that the tank be on the exterior of a vehicle. The propane tank should have a hand-cranked valve and refill port.
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2
Install the propane lines and switching valve by mounting steel propane-rated tubes underneath the vehicle in about the same locations as the gasoline lines, if possible. The steel lines should run from the tank to the front engine intake manifold, directly behind the throttle plate. The switching valve should be an electrically operated shut-off valve that will turn off the propane supply when switched to gasoline, and vice-versa.
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3
Install the throttle plate ring by unscrewing the air intake and removing the air intake hose or snorkel. The plates are designed to fit between the air intake and the throttle plate, and inject the proper amount of propane depending on the throttle position. The ring is held in place with the air intake hose.
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4
Test all propane fuel line connections for leaks with a tester and your nose. Propane has an additive that is designed to smell badly when released into the atmosphere. With the system pressurized, there should be no smell present.
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5
Adjust the computer's timing and power curve with a scan tool, or a laptop computer, to accommodate the change in fuel density. Usually, propane powered engines will run better with slightly advanced timing, and will also run cooler than gasoline.
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Tips & Warnings
Engine running on propane do not require warm up periods before use, like gasoline.
Use extreme caution when working with explosive fuels.
