Bonjour, So we have a 115 Sport powered by MTU 2000 series V16's Sludge (waste fuel oil) tank has four engine connections to it and one from the fuel polish unit. There is a pump out port (with a QD connector) on a pickup tube (as expected) and *a tank vent that is on a welded bung that has an pickup tube as well. Now that is what I am wondering about, that tank vent on the other pickup tube. How does that work and is it the correct application??? Please explain how a 50 gallon capacity tank can vent, when that vent line is submerged by being connected to a pickup tube. When at 8 (+/-) gallons indicated on the Tjessen that vent will offload into the bilge via that pickup straw like a squeezed juice box. Now the engine to sludge tank connections: On the B side of the engine,about half way, and under the exhaust manifold [ Designation F46 ] [ Leak fuel level ] is where the first sludge tank line connects. The other sludge tank line is connected, again on the B side of the engine, towards the top, in the vicinity of the [ Designation B48 ] Fuel Pressure ( in rail ) and [ Designation YB33 ] Fuel Temperature. It was suggested that one of those lines should be connected to return to the top of the fuel tank... Because if the emergency shut down were to happen at a high rate of speed, that the electronics will shut down ( the injectors will stop feeding the cylinders ) but the HP injector pump will continue to run for a short interval. Thus very high rail pressure will be jetting from the HP fuel valve, and so the vent line... I believe there are two mistakes in this engine / sludge tank installation. Please advise. Either educate me or confirm my suspicions. Thank you for your anticipated replies... cheers!