http://wiki.flightgear.org/Howto:Write_ ... _in_JSBSim
Check out the spitfires fuel system.... it might help you.
<summer name="fuel/manifold-total-flow-pps">
<input>fuel/pump-flow-rate-pps</input>
<input>-/systems/fuel/tank[5]/leak-flow-rate-pps</input>
<input>-fuel/manifold-dissipate-rate-pps</input>
<!-- <input>-/fdm/jsbsim/propulsion/engine/fuel-flow-rate-pps</input> NOT NECESSARY: engine sucks already (see feed command) -->
<output>/fdm/jsbsim/propulsion/tank[5]/external-flow-rate-pps</output>
</summer>
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