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FSXA Fuel system trouble

A

Alexis

Messages
218
Country
greece
Hello again!

I'm trying to code the fuel system for my aircraft and I'm running into an issue with fuel tank selection.
When selecting the external fuel tanks I'm doing a check. If either of the tanks has fuel in it, the engine should draw from the two external tanks (value return of 17). Else, it should switch to both (internal, value return of 16).

When the exteriors are empty, I get a proper result of 16 for my fuel selector.
When not, though, it keeps jumping between 16 and 17, which would yield unwanted results as the internal tanks would be consumed before the externals.

Code: 
<!-- ENGINE FEED-->
     <!-- Feeding from external wing tanks -->
     (L:switch_wing_xfer_prs,bool) 1 == (A:GEAR HANDLE POSITION, Percent) 1 &lt; or (L:switch_ext_xfer,enum) 1 == &amp;&amp; if{
       (A:FUEL TANK EXTERNAL1 LEVEL, Percent) 0 == (A:FUEL TANK EXTERNAL2 LEVEL, Percent) 0 == &amp;&amp; if{
         (A:FUEL TANK SELECTOR:1, number) 16 != if{ 16 (&gt;K:FUEL_SELECTOR_SET) }
       }
       
       (A:FUEL TANK EXTERNAL1 LEVEL, Percent) 0 != (A:FUEL TANK EXTERNAL2 LEVEL, Percent) 0 != || if{
         (A:FUEL TANK SELECTOR:1, number) 17 != if{ 17 (&gt;K:FUEL_SELECTOR_SET) }
         } 
       }
 
I assume you may have another gauge forcing them to the internal tanks?
 
No, this is the only gauge.

I redid the code from scratch using a different method and it worked. I couldn't see why the above thing was jumpy.
 
Getting fuel systems to work right is a nightmare. Once more, on top of these issues, you have to deal with 'saved flights' from other planes, which will over-ride code driven fuel selection systems.
 
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