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I did the air valve side first – has just the one o-ring, went smoothly. With the fuel valve side (the one with the teensy o-ring in addition to the larger one) the larger o-ring just did not seem to seat all the way in. I know it did not go in as deep as the other side. But I figured maybe that’s just the way it is. When I was finished though the valve did not protrude as much, and that was most likely to do with the fact the larger o-ring didn’t seat as far in as it should, keeping the valve “pulled in a bit”? As an end result (this is my theory) the motor fuel pump is trying to draw gas but can’t get it out of the tank. All it is doing is creating a vacuum (depressed bulb). Are the two valves supposed to protrude out of the assembly equally? Could all the above be my problem? At one point today I removed the gas tank cap thinking that might help but it didn’t make any difference.