Hi Guys (and Gals) - I am kit bashing a 4 Star 120 and I have built an engine cowl. The cowl is covering an inverted Saito 150 GK with the Slimline inverted Pitts muffler. I am using a 3 line fuel system. Line 1 from tank to engine, Line 2 from tank to Slimline Fuel Dot, and LINE 3 - Well this is the question????

I don't want to have a loose fuel line hanging down under the plane to disconnect when fueling, and I don't want to run enough fuel into the muffler to have it show me a full fuel tank by running out of it.

What I have decided to try is: I have fit two plastic fuel nipples through the bottom of the engine cowl next to each other (see pic). I have ran the vent/pressure line from the tank to one nipple and ran a short line from the mufflers pressure fitting to the other nipple. I then have a short line on the outside of the cowl connecting the two completing the loop (they say a picture is worth a thousand words, please see pictures).

To fuel the plane all I hope to half to do is use the fuel dot to fuel, disconnect one side of the outside loop, and wait for the tank to fill and blow excess fuel out the open nipple. All I have to do then is reattach the hose to close the loop again.

Is there an easier way that will still keep the lines fairly well hid??
Is this to much line length to maintain good tank pressure? I figure if I have several oz of psi at one end I should have equal psi at the other.

So what do you all think, Yea or Nay

Hey Gregg!!

I've done the same thing!!! what is also nice about this set up is, that you can attach a catch tank and save fuel!!

Later, Scott

What I have done on my pattern ships is put a check valve in the vent line at the muffler. Then install a "T" between the check valve and the tank. connect the third "T" line to a second fuel dot.

To fuel the plane pull both dots and open the vent line and fuel thru the clunk line. I don't have a third fill line in my set up instead I use a "T" in the clunk line between the tank and a Cline regulator. The third line on this "T" goes to the first fuel dot. If you don't have or want a Cline just make sure the throttle is completely closed while fueling.

DEG

Personally, I really like the idea. I will do the same thing on my next cowled plane. Maybe this is a common practice, but it is new to me.

I like the idea> I am sure the air pressure from the muffler will be sufficient to "overcome" extra length of the tubing. There is only one thing I'd like to point out. I am using a fueling system from the SlimLine, which is installed directly on the fuel jig. It has 2 lines - in and out. When I am fueling thi plane I am collectin "out" line to the (3rd) dot and "in" line to the pressure tube. In this case I have a complete circle for fuel to flow. The negative pressure created on the "in" line (because that's where pump is sucking the air) gives extra insurance that fuel will not flow to the carb (especially when carb is fulyclosed).

That should work just fine.

Personally, it's too much work for me. I just let it run outta the muffler