I have an iron tank that is being filled with creosote oil (from a coke oven, via buildcraft pipes). Everything works fine, the tank gets a bit of oil. For no reason, after a little while the tank stops accepting oil, the oil level does not rise (despite the oven still producing oil and the pipes still pumping oil).

I have noticed that the front of the tank (with glass) can still be used to open the gui, the back of the tank (no glass) cannot. So it looks like the back wall of the tank is unloading?

Currently I have a turtle breaking and replacing a block in the back of the tank. This 'fixed' the issue.

version?

I am playing in the latest Feed the Beast mod pack

The issue was fix in 6.8