Hi AirbusDrvr, no problem, I will photograph the installation on Sunday night after I have flown the aircraft. I would do it tonight but I need to take the cowl, prop & spinner off to get to this part of the engine. Nobody can complain if they have fuel feed problems on a non-pumped motor if the tank sits more than 7 inches from the engine, the exhaust pressure in the tank then becomes very erratic and varies very greatly between a full & almost empty tank, and of course the attitude of the aircraft whilst in flight. You are then risking the motor getting very hot during at least part of the flight. The problem (?) with OS 2 strokes is that they are very tolerant of running lean and most times you will not feel or hear it, but when it is overhaul time have a look at the piston, you can easily see the burn marks near the exhaust port.

From all I have read on this thread regarding the construction of the DV, a lot of people seem to put the tank further back for one reason or another. In many cases this will unfairly give the OS 91 (which seems to be the preferred engine for this aircraft) a bad name for the reasons given above. I have also read many threads on RCU that say that the normal (non-pumped) carbs on OS 2 strokes cannot handle the extra fuel pressure. This is so very wrong!!!! I have installed this mod on everything from the OS32 up to & including the FX160 and it works every time. The advantages of installing the pump right in the backplate are that a) the pump is much more efficient as the pulse comes directly from the crank case into the pump, b) there are no pressure pipes to develop an air leak causing loss of pressure and immediate engine stoppage, and c) there are no modifications needed to the aircraft, the old exhaust tank pressure line just becomes the tank overflow.

Looking so forward to finally getting my DV, I am going to need a LOT of advice as I am not a very good builder!