Minecraft 1.15.2
Forge 1.15.2-31.1.77
Mcjtylib-1.15-4.1.0-beta
Rftoolsbase-1.15-1.1.1-beta

builder fluid filter does not work
video-- https://mega.nz/file/T1M0RKyI#m3-0-t6-Pj20ymvFleV397Nq-NWrAtI0Ywy112q1b5A

That's not really a bug. The filter module is actually only an item filter. It's not designed for fluids. I may implement that in the future

A fluid filter would be greatly appreciated. There aren't a lot of options that allow one to control what fluid the builder picks up. The best I've got so far is to ensure there's always some fluid in the tank it's feeding into and setting it not to pause when it can't act. But that means it keeps on checking the area even if the tank is full.

Note that you can use the RFTools Utility tank which supports a built-in fluid filter. If you place that on top of the builder you can restrict the fluid like that