fuel drain when firing

I am making a beam turret (in ResEdit) that uses the ship's fuel/batteries as ammo. However, the weapon is very powerful and would make sense to guzzle a lot of power, but I can't figure out which field/value(s) will change how much energy it consumes. No, I don't want to make its outfit always drain power, because that can sometimes have bad results. Can somebody tell me which values/fields determine how much power is consumed by a beam weapon?

The ammo field. Check the Bible for exactly what to set it to - it uses some simple formula for determining it.

I think it's something like -1000 + units-of-fuel-per-second. Eg, -1004 will make it use 4 units of fuel per second.

-1000 & below     Weapon uses abs(Ammo Type + 1000)/10 units of fuel per shot.
(example: -1005 = 0.5 units per shot)

This is the only way you can do what you want.