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MSFS20 SDK Limitations

S

Shortways

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I am trying to adapt the fuel system of an existing aircraft, which I did not make.
I’m new to this, so it’s trial and error.

Before I get into the details, I would like to ask a few general questions:
1. Is it possible to connect 2 engine driven pumps to 1 engine; each with their own tank?

2. If yes, what would be a possible reason for the following; If one tank has a larger quantity (and size), only this one is used until decreased to the same quantity as the other tank, thereafter they run parallel (balanced qty)?
 
New or old fuel system?

Is the [FUEL_SYSTEM] in the flight_model.cfg using the old legacy fuel system (which you still find in many simple aircraft in MSFS) or is it using the new complex fuel system (you find in the Airbus etc)?

Because if it's the old system then the number of pumps is irrelevant. There's either an engine driven pump or there isn't.

With the new system you can plumb it up however you like which means as many pumps as you like wherever you like.

To do what you want in your second question, you may need to custom code that. Check the fuel levels and open and close valves as necessary to maintain the fuel balance. You could do that with the fuel selector in the old system or use junctions in the new system (or valves).
 
Hi, thanks for your answer.

It’s the modern fuel system, but the described auto balancing behaviour is already happening and I want to stop it from doing that.😎
The devs thought the system was not intended to run on both tanks simultaneously and so coded to close one of the fuel valves with the fuel selector in ‘BOTH ON’, until one tank is empty. But then it’s not possible to do the original pre-flight checks/tests.

In the real system, at higher manifold pressure a check valve closes off that one tank and at low mp uses the tank. I managed to simulate the latter, but now … at low mp, the lower qty tank is inhibited until both tanks balance. And I don’t want that balancing to happen.
 
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