Hi,
Your pressurized tubes won't accept gas from the electrolytic seperator, or any other machines.

I've tested it with the newest forge with only your mods installed (Mekanism, Mekanism Generators and Mekanism Tools).

Use the configurator on Fluid more and shift right click on the end portion and set it to extract (pull)

I feel like a coplete idiot right now ....
Works as expected -.-