Seems to me I recall a problem of burned valve seats being the demise of propane conversions. Another dumb question: why is it that this occurs and why hasn't someone engineered a fix for this? I think they use propane on towmotors because they are used indoors in warehouses and you can't have the products of combustions from a gasoline engine indoors. Why is it that those towmotors seem to last forever burning that stuff but cars/trucks get burned valve seats? I guess that's actually three questions...
