Fuel only when used on automatic thingies

[ziame]

There is a setting, that makes the fuel only used, when the fueled thing is in use. However, it doesn't seem to work on automatic things. Anyone has any experience with that?

What I want to accomplish is automatic turrets that use ammo-fuel, that is only used when the turret is attacking.

What i accomplished is that they fire, but the ammo is never used up.