Brodak wedge tank OS .35S question??

I have a 3 oz. Brodak standard vent wedge tank to feed a OS Max .35S with muffler. I want to use pressure and my question should I put pressure line to overflow or top vent tube? I used this tank with a McCoy .35 and non pressure as it was ok start up needle setting was tricky. The OS I have mufflers for and is easy to run pressure.
Dan

I use the fill pipe to pressurize and cap off the bottom overflow pipe after tank is serviced.

Dan,

If it is an old standard over/under vented tank, it shouldn't matter much while the model is airborn. The fuel is pressed toward the outer wall by centrifugal force, so they both 'uncover' into 'air' space quite soon. This shouldn't make the ground setting a problem.

I usually cap the uniflow vent, and use the overflow vent for pressure on a uniflow tank. Only reason is that the outlet for the pressure into the tank may be too near the fuel pickup, and bubbles might get to the fuel line. Not really likely, but...

Lou --

> . . .
>I usually cap the uniflow vent, and use the overflow vent for
>pressure on a uniflow tank. Only reason is that the outlet for
>the pressure into the tank may be too near the fuel pickup,
>and bubbles might get to the fuel line. Not really likely,
>but...

I thought if you capped the uniflow vent and ran the muffler pressure into another pipe, it was not uniflow anymore. I never really thought about it, I just assumed everyone ran the muffler tap to the uniflow. Have I been all wet? Obviously, you are happy with your set up!

Edit: I didn't understand what I said

Larry Fulwider

Larry,
No you're not all wet...and in most cases this is definitely the best way to do it.
pressurizing the overflow or fill vent usually still winds up with a rich to lean condition throughout the flight.