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Message: <blockquote data-quote="dfb" data-source="post: 141623" data-attributes="member: 11792">As previously mentioned, there are companies out there making aftermarket fuel injection systems if that is the direction you wish to go. The system would be sized by engine displacement. Howell systems are based off GM Throttle Body Injection {TBI} units. These systems are reliable as a locomotive and pretty simple in design. Some of the basic requirements these systems need are rpm{crank sensor}, load MAF or MAP sensor}, engine and intake air temp. O2 sensor may not be necessary. Even Zenith makes{or did} a fuel injection system called ZEEMS, It also was based on GM TBI. I have worked on one of those and can tell you 1st hand I would not recommend it.My 742B with the Mitsubishi gas motor works great in all temps here in the Boston area. I have had trouble with carburetor needle/seat issues but MANY  carb kits are no longer made with alcohol friendly components that can aggravate fuel system problems regardless of how many times parts are changed. I would be interested in hearing more specifics on the issues you are having with your vapor lock problems.</blockquote>