In my experience, BC waterproof pipes have......strange issues. I swear they were losing lava in one setup I had. I was like "where is all my lava going ?" This was only on a long BC waterproof pipe run.
Once I switched to TE liquiducts, I've never had a problem.
I noticed you're using TE machines in one of your screenshots, so you have TE installed. Good. Try replacing the Gold Waterproof pipes from your tank to you engines with TE liquiducts. The liquiducts will require you to 'wrench' the interface connect to your tank so it's pointed it out and then a redstone signal like a lever to activate it. Wrenched output + lever is the equivalent of a redstone engine + lever "powering" a wooden waterproof pipe.
One nice thing about TE liquiducts and energy conduits is you can measure them using the hand-held TE meter.[DOUBLEPOST=1379523075][/DOUBLEPOST]
Combustion engines are a buldcraft engine that is very efficient with refined fuels. It produces a net gain of about 28% more power when factoring in the stills from the same amount of source material.
Biomass goes into a still and is condensed into biofuel, usually requires about 4 stills per fermenter. The biofuel burns better in combustion engines and boilers and is easier to store because of the higher energy density.
Agreed. For on-demand quick on-off power, it's hard to beat a combustion engine.