It's nice to know we can all still have our opinions Jan. I find the CG change from fuel burn to be noticeable and unacceptable if the tank is all the way up front. 16oz of fuel is about 3/4 of a lb. IMHO, that is a bunch of weight change on a 6lb model. I also find it much easier to install a Perry Pump with just two screws as opposed to modifying my airframe and cowling. The adjustment of the Perry pump took less than 30 mins (I admit I didn't time it but it wasn't very long) and I haven't had to touch it again. The OP wants help getting his pump adjusted correctly and I am not going to try and change his mind. I am sure he has his reasons for wanting to do it the way he is doing it, maybe he just wants to learn how a pump works. It's important to try different ways of doing things; one size doesn't always fit all.