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I recently decided to play KSP again, after taking a break. When i wanted to fly to the mun, my asparagus staging was not working. After doing some research and testing of my own, i found nothing wrong with my design. I have reason to believe that the fuel lines are not working and are bugged. The last time i played KSP was version 1.4.1, and i did not install any additional mods since 1.3 (only updated them). back in version 1.4.1, my asparagus worked. I have no idea how to fix this, if anyone has any ideas on what is going on i would be very happy.

I have a large rocket with multiple stages and I am trying to do a modified asparagus staging. As you can see from the pics the plan is for the two "A" tanks to feed into the "B" tank which feeds into "C" and then into "D", jettisoning each letter as they dry up. It works fine once I launch, the "A" tanks start to drain with no fuel being used from any of the other tanks. Once the "A" tanks are empty the "B" tanks start to empty, with no fuel being used from "C" or "D". But once the "B" tanks empty I start to use fuel from the "C" and "D" tanks which is not right...the "C" tanks should empty while the "D" tank shouldn't. It's not an issue of two tanks feeding a single tank because there is no problem with the two "A" tanks feeding the single "B" tank. And I'll note that all the decouplers have their crossfeed disabled. I have a bunch of mods installed but nothing that should affect fuel flow. GameData folder is in the album above. Is this a stock bug that I am seeing? Thanks! P.S. Guess embedding Imgur albums is broke again...

Astronauts, lace your boots before flight ! Seriously, since cargo bays occlude radially mounted engines and air intakes so regularly, i thought i'd try get this working in our favour for once. Offset those wings inside the cargo bay and run a few fuel ducts between them. Blast off the pad with not much fuel and a stupidly OP engine, see how high we get before falling back. Do the same with the ducts removed. After all, both ends of the duct are inside the cargo bay so there should be no drag, right? With Ducts - max altitude 44,058. Without ducts - max altiude 67,486 It's an issue because ok, nobody really needs this many ducts. But I'm trying to build the most efficient stock SSTO I can, and there's a few factors i'd like to combine to make something great - *big S delta wings, since their mass:lift rating ratio is the same as all the other wing parts. And they hold LF too, as fuel tanks they have the same fuel mass:dry mass ratio as any other tank *generous wing area, for low angle of attack at 25km + altitude, therefore low drag in the closed cycle part of the ascent *... due to the low drag and wing supported flight, low twr, high ISP NERV engines can be used, leveraging the LF capacity of the wings. Little or no oxidizer to be used. *generous wing area leading to low landing speeds offworld - when refuelled this SSTO can go to Duna and Laythe safely What messes all this up is the fact that NERV (all rocket engines for that matter) will not pull any fuel from wing tanks without ducts. In fact even if you just use dry wings and a stack of fuel containers above each engine, you're going to have horrible CG issues because the rockets empty the tanks front to back. It looks like you're just meant to attach one large tank to each engine and discard both when empty. Also, if your wings aren't doing any thing for you fuel wise, they become dead weight, which is i guess why people fly to orbit with tiny stub wings that can barely take off given the entire length of the runway. Like I said, I prefer larger wings that enable better STOL performance in my SSTOs.. What's the answer , if you 're trying to be 100% stock? Transferring fuel manually is out of the question, the average user has their hands full with the flight controls, trying to maintain a good ascent profile (myself included). Fuel tanks can't be bound to action groups so you can't lock stuff off to eg. force the jet engines to use the wing tanks during air breathing phase. You could build small like this (two of the biggest wings, one engine, so we need only two ducts). But that wing has lower heat tolerance, which i can work around, but isn't going to be easy to fly for most people. Also it's not going to be a big enough craft to put the sort of loads most people want up there. So, all I have left are mods that'd disqualify me from any K prize or that might put off new users downloading the craft from KerbalX. eg. tweakscale, so i only need one pair of wings and 2 fuel ducts eg. auto fuel balancer like GPOSpeedPump A WIP SSTO. I've noticed that if I set prograde assist and drop my AoA to zero, it has no effect on the drag from fuel ducts - unlike drag from fuselage parts. The fuel ducts of this design cost about 6% more total drag here.