CountLagula

Well, interestingly, all three things are required for it to function, and one of them is sort of annoying as it reduces realism in other ways, but also has the happy side effect of balancing fuel use from both wings at once. The RESOURCE string must obviously be added to the wings for the fuel itself, under standard part parameters at the bottom add fuelCrossFeed = True, and in Squad's resource folder (here's the annoying one), Change under LiquidFuel, flowmode = ALL_VESSEL flowmode = ALL_VESSEL is the same thing that governs electric charge and intake air. It evenly distributes fuel out of all of the tanks used on the aircraft, however this could be problematic (cheaty) because it means COM doesn't change as fuel drains, out of ANYTHING, since you're changing the way the resource behaves universally. Basically it makes everything REALLY stable. Things that use LFO less so because you didn't change that. Unless if course your primary concern in spaceplanes in which case you also have to change the parameters for oxidizer. So anyway, have fun with that, and if anyone finds a better solution, let me know.

I DID IT! AFTER A YEAR OF THIS THREAD BEING OPEN, FUEL IN WINGS WITHOUT A PIPE (Usable)! BAHAHAHA. Not sure which of the things I did fixed it, but I'll narrow it down and edit again.

I have added the resource lines, but I'm trying to figure out a way to make the engine pull fuel from the wings without a fuel line attached.

Sorry for the AGAIN necromancy, I just was playing around with the numbers with FAR installed, and it looks like the optimal amount of liquid fuel for one delta wing is around 220. Most designs will still take off quite easily this way, and depleting the fuel has no real effect on the drag with FAR installed, so nothing else needs to be changed. I sent a message to one of the devs, and am hoping for a workaround that lets us get rid of he fuel line, and I will update if I hear back.