my son has our old (25yr )7.5 sears motor--it is black --ran fine with the sears tank but i got tired of buying the 40$ pressure tanks as they would only last a few years-- so i got a regular tank--now, sometimes the small check valve ball in the pressure bulb sticks and stops all gas flow--motor stops--bulb has to be removed from line to unstick the ball-- any comments on this problem???--can you remove the ball and run without it or will the tank loose pressure?--thanks for any comments--somewhere on this fourm i think there is a "sears" motor section -- cant find the darn thing today--thanks again--david