HI EVERYONE!!

JUST FINISHED MY KYOSHO CAP 232 .40 SIZED WITH AN OS 46 FX AND A BISSON PITTS MUFFLER INSIDE THE COWLING.
IM HAVING PROBLEMS WITH THE FUELING SISTEM, IM USING A KWIK-FILL FUELING VALVE FROM DUBRO, A LINE GOES FROM THE TANK TO THE VALVE AND THEN TO THE CARB. ANOTHER LINE GOES FROM THE PITTS MUFFLER PRESURE NIPPLE TO THE TANK AND I HAVE ANOTHER LINE FROM THE TANK TO THE OTSIDE LIKE A OVERFLOW LINE THAT IS SEALED AFTER THE TANK IS FULL.

THE VALVE IS IN PERFECT CONDITIONS AND DOSENT LET AIR INTO THE CARB

I THINK IM HAVING PRESURE PROBLEMS, AM I DOING IT THE WRONG WAY?
IS THERE ANY OTHER BETTER SISTEM TO FILL THE TANK WITH A COWLING WITHOUT BRAKING IT ?
WHAT ABOUT CRIMPING ONE END OF THE MUFFLER TO INCREASE PRESURE?

ANY ADVICE OR TIPS WILL BE VERY APRECIATED

THANKS

HERES A PICTURE OF ME AND MY NEW CAP