Is it possible to stop fuel flow from a certain tank?

[Rutabaga22]

I have a space shuttle with some liquid fuel tanks for jet engines, but I don't want my OMS taking fuel from them. How do I stop the OMS thrusters from taking from the LF tanks?

[18Watt]

That is a good question, and I don't have an easy answer.  Stock KSP does not allow you to specify which engines a tank will feed to.  My first thought is that you will need to separate the tanks which feed the jet engines from the OMS thrusters with parts which don't allow fuel crossed (either by default or by advanced tweakables).  But if your OMS thrusters are on or very close to your engine's tanks, that presents a real challenge.

Hopefully, somebody will check in with a workable solution or two.  Do you use mods?  I suspect some of the solutions will involve mods..

 

[Rutabaga22]

1 minute ago, 18Watt said:

Do you use mods?  I suspect some of the solutions will involve mods..

I use so many mods. Too many mods.

[Caerfinon]

48 minutes ago, Rutabaga22 said:

How do I stop the OMS thrusters from taking from the LF tanks?

Right click the tanks during flight mode, and lock them. Can be done in stock. 

[Superfluous J]

You can also disable fuel flow through docking ports and enable it through certain things, such as decouplers.

You could also use the GPO Fuel Pumps mod and set its priority very high so even though it's being used, the other tanks keep pumping into it. But that'd be a bit odd