if your looking for a electric solution to wrap around steel lines, the veggie world uses stainless steeel welder wire, there are people in the veggie world that sell them there usualy called "injection line heaters" there just a certain length of stainless steel wire feed welder wire that makes a certain AMP load then there insulated in special high temp heat insulation and wrapped around the injection lines on the diesel engine. There usually cheap.. under $50 for 4 or 5 of them.. you can make them your self even cheaper.
As for vapor lock, The engine coolant hopefully would be cool enough to not lock it, you could use a automatic valve that coupled to a temp sensor to regulat the temps.
__________________
|