The current setup is a 3 line setup ... vent line, tank to carb line and muffler to tank line ...

fuel system is the same ... only the motor was changed ... enya 120 R to a Enya 1.55 R ... The 1.20 ran fine not pressurized ...

thus acting like a dual vented tank ... I would think ...

only plugged off the pressure fitting to the muffler.

Same for the 1.55 ... only the 1.55 acts like it starves for fuel at the High end ... when I do get it to run at high RPMs (full throttle) .... I have a very narrow adjustment range ... making it hard to tune for peak performance ... motor has 1 flight on it .. which almost was its last ... dead stick landings are not fun when initialized at 150 ft upline to hammerhead and motor dies before you reach the top! nice tailside though ... but not much room for error when ground is coming up quickly and you need to find the runway in a hurry ... I made it with a textbook landing ... but the cardiovascular system got a workout!

other than that, I ran 2 16 oz tankfulls in it prior to flight and I was only semi confident in the setting ... which did seem to be ok for the ground ... not in the air ... Motor seemed to want to run on the lean side of the setting but I choose to stay on the rich side because of the new motor sysdrome ... fuel used: 15% cool power.

motor also had a 16 oz tank ran through it on the bench ... which dad said he had it adjusted and running fine ... I told him that was on the bench and not in-cowl nor in the plane and did not count for more than a good starting point ...

this procided to a Father-Son moment! or a double senior moment ...