If you are using quick connects it is likely that you need to wrap with PTFE thread tape to ensure seal... If you aren't that would indicate a leak in the tool meaning the tool should be replaced...
SOURCE: air allways and continually leaks forcably from the top. Bostitch
This nailgun has several parts to the headvalve that must fit together properly to seal. Go to WWW.toolpartsdirect.com for a diagram of this tool. The part called the diaphragm is source of problem. It has thin vinyl walls that will fold over when you assemble. The piston will not cause the gun to leak, just make sure that piston fits snug into the cylinder. Loose oring on piston will only cause low power or the poston may not retract all the way back up. Some piston/drivers had a plastic ring instead of an oring. The plastic ring had a secondary oring under, however not necessary. You can use rubber or plastic, just make sure that the piston is not too tight or too loose. The piston oring is the only oring in the gun that can be cut to fit. It is like a piston in a car engine. The piston rings have a gap.
SOURCE: THE CRAFTSMAN AIR NAILER I HAVE WILL NOT WORK
If you are using the nailer rapidly and the outside air temp is 50 degrees or less use antifreeze instead of oil. The head valve could be freezing
SOURCE: Need an owners manual
SOURCE: porter cable brad nailer only fires brad on second trigger pull
The dent in the wood is not caused by the air. It's caused by the set that drives the brad. Are you oiling it consistenly? Are the brads the right manufacturer for your porter cable brad nailer? From the information you give it appears that the brads are not advancing correctly or that the air pressure is not sufficient to dislodge the brad from the brad strip on the first strike - it takes an additional strike to break it free. The standard for adding oil is to add ten drops of air tool oil for every hour of operation. That seems like a lot, but the correct amount of oil is a sure way to prevent most air tool problems.
Testimonial: "Thanks for the info. I was not oiling it at that rate. Is there anything I can do to fix the issue now that I didn't prevent it?"
SOURCE: My Sears Craftsman 18 gauge brad nailer won't nail
Your driver is not returning. Depending on the model that you have there could be a couple of problems. The most likely is that your piston stop is crumbled and some of your seals are worn or damaged. Whether or not you can fix the nailer depends on if the parts are available from Sears Parts Dept. If you would like some more information about fixing your nailer please post which model it is that you are trying to fix and I can see if the parts are available. I will post the information back to you.
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