Over-blending

[Ronmar]

A properly engineered gasoline fuel system won't typically vaporize the fuel.  One feature of most modern fuel systems is they pump more fuel than they consume, so a larger volume is circulated thru the system and overall maintains a lower temperature.  This was not always the case with older carbureted engines wher a smaller volume was moved just to the carb float bowl.  Hot engine would often boil the fuel.  

First vehicle I ever had was a 69 datsun truck.  I swapped out the original 1200CC engine with a 1600CC OHC engine.  The fuel feed was to opposite sides of the engines.  So, me not knowing any better, ran the fuel line from the original feedpoint, around the front of the engine compartment to the new engines fuel pump and carb.  This basically placed the fuel line on top of the radiator.  Did I mention that I made the line out of copper...  Well needless to say, I got an education on gasoline vapor properties and proper fuel system design...

That is ehy I asked about heat.  Slow, non recircing fuel systems can have this problem.  Simple fixes, keep the line out of the enclosure as long as possible, and insulate it where it passes inside...

[Crofter]

Jens, I can see that you want heat as the most effective way of reducing viscosity and improve injection spray. I assume the reducing with gasoline is to thin its cold viscosity and get it through the filters before you heat it prior to injection. Any vapor sure gives the hiccups to the injection system though doesnt it? It also creates problems for the pulse diaphram carburetors on chain saws etc and the move has been to isolate the carb from the heat of the engine with flexible connections. This also reduces the effect of vibration. You know what happens if you shake a can of pop before you open it. Dont know how much of a factor that could be on a Lister