If engine heat is a problem for Propane why do the forklift makers mount the tanks on top of the engine on the hood ? mine was mounted close to the engine compartment and never vented and I live in AZ also,you guys never saw a farm tractor with a 100 gal propane made into the hood setting on top of the engine ? FWIW that is the reasoning behind the 80% fill on propane tanks to prevent the venting from heat good luck