Actually the gasoline is sprayed into the intake port behind the intake
valves.

You DON'T want to heat the gas tank for a lot of reasons, not the least
of which it isn't necessary.  There have been gadgets around for years
that heat the fuel before it goes into the engine, usually marketed as a
magic gas saving device (if it worked the automakers would include it
already).

The EPA has tested some of these devices and they don't work, gadges
such as the FuelXpander; Gas Meiser I; Greer Fuel Preheater; Jacona Fuel
System; Optimizer; Russell Fuelmiser.

If you really want a engine running on vapor try an LP gas conversion,
it's well proven technology that works.

Jeff DeWitt

Suppose that our fuel tank was very safe, and 100% safe from
explosions.

Instead of fuel injectors, why not heat up the fuel, and pump this
high pressure gaseous vapor into the pistons?  I would like to see the
gas tank heated - kind of like a pressure cooker.  And the escaping
gas vapor gets channeled into the pistons where it's further mixed
with air.

Currently, liquid gasoline is sprayed into the pistons.  From what I
understand, the finer the mist, the better and more thorough the
combustion.

Since the gaseous gasoline is the limit to how finely you can atomize
the gas, I would think that this is the most optimum way to put gas
into the cylinders.