Gave a 9.6 Montgomery Wards to a friend and before he took it I put it in a barrel and ran it. Worked great. He took it home and the next day went and bought a tank, hose and the fittings. Filled with gas and the primer bulb won't pump up. He said he pumped about 30 times. What could've happened? Maybe the bulb is on backwards or the fitting on the motor?