Yes , Bullydog and Diesel Performance Products makes a propane injection system. A few guys on the Busnut online site have run propane on their older busses. Gale Banks says that there are a lot of modifications one could make that would add power and efficiency before attempting LPG injection. (Admittedly, he sells those other power-adders but I believe he also is quite respected among diesel tuners) There is debate as to whether it would shorten engine life. A pyrometer would be a "must have" when applying LPG.
I, too have been intrigued by LPG injection.
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1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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