Yes. I was reluctant to try the pump with the stock carb, but it did improve it somewhat. My carb had issues that I couldn't figure out. After changing to the Magnum carb, all is well. I started this thread after only running the engine one time on the test stand. Now that I have the engine figured out, I stand by my words. The engine is impressive. Comparable power to a Saito 180 at half the price, and it likes 10% fuel. May be a little heavier, I'm not sure, but runs flawlessly, and pulls my 11 lb Sukhoi very well. Now I have no pump, and don't anticipate running one. It's not needed with my tank position.