Don't know what parts you got in the kit you acquired- but if the valve is leaking, make sure you have no dirt in it, and leaks beyond that are likely to be related to parts 140-058 (o-ring) and 140-070 (brass piece). Bob is correct on his advice. That being said- are you sure it is the valve leaking, or is air even getting that far? You may want to check the inside of the tube for surface rust and the condition of the pump cup seal (the one you need to use a puller to remove). Post a link to the kit you acquired so we can see what you got in it.