I am not running a pump, just muffler pressure on mine...The engine is side mounted, the tank is 7" behind the carb just below center of carb...I am running large fuel line and have absolutely no fuel draw problems at all.

Primes and starts extremely easy, very smooth and quiet.

I am running a Mejzlik 18/8 at 8600 on 30% nitro.

Mounted in an Extreme Flight 74" Yak