More interesting mechanical heater question for
the math gurus out there:
    OK, I'm installing this fuel heater and it requires
at lease 3 PSI of fuel pressure by way of an external
electrical fuel pump.   The way I figure the batteries will be
dead way before I run low on fuel. SO I'm trying to
cut out as much battery drain as possible.  I'm thinking
that I may be able to raise the fuel tank high enough
to get the pressure I need.  Assuming the fuel has the
same weight as water, how high would it have to be?
And for that matter would there have to be a minimum
amount of fuel in the tank at all times?
                         Eric

  IF you hear a BIG Poof, that was the heater blowup!