HI, if it happens when you press the trigger the top valve is sticking & your gun needs servicing.
If it is just leaking by itself the trigger assembly needs serving or you can replace the trigger unit. They are not expensive & come as a complete unit (depending on the model).
Moselikely the orings are worn out or dirty
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I have seen this on dewalt nailers also, caused by trigger valve worn. on Bostitch nailer part # tva6 remove roll pins retaining trigger and trigger valve. one roll pin for trigger and one or two for valve. With pins removed apply air pressure to gun popping out the valve. Use glove or folded-up shop rag to catch the valve as I pops out. Be sure to reduce air pressure as it could come out with force. Good luck
Remove the nails and take off the trigger to expose the trigger valve (usually part # tva6). Connect air and spray soapy water on the valve to determine if the air is leaking from the center of the valve or around the outer edge between the body and valve. If leaking from the center, could be defective valve or debris under oring. Pop out the valve and examine internal parts for cut oring or defect. If leaking from between body, you could have cut orings installing the valve. Make sure that there are no rough edges in the body of the gun. Bump fire or single fire happens with the trigger type not the valve. Bump fire trigger is usually black metal and single fire trigger is light color plastic. Good luck
There are about three issues with this gun that could cause your problem. The safety contact arm not depressing the trigger pin fully, worn trigger valve (tva6), or leaking orings in the headvalve. Easy tests. Remove the nails, and remove the trigger to expose the tva6 valve. Reconnect air and with very quick and firm action, depress trigger pin all the way in. If the gun fires, adjust safety foot and trigger so that the trigger pin is depressed all the way in each time that you fire the gun. If the gun does not fire, remove the head and remove the headvalve. Examine the surface/s where Orings make contact with magnify glass looking for fine scratches. Sand with 400 grit paper. Orings must make good contact here or gun will not fire. Lube orings and surface with silicone paste lube (sold at Lowes in the plumbing department or swimming pool supply store). If no fine scratches and surface looks smooth, replace Orings in head and the tva6 valve. Good luck with your repair/
The problem is most likely the trigger valve. P/N FA205BA1 any Bostitch dealer should be able to get it for you. Its a complete cartridge that slids into the gun frame, unfortunatly you can't just change the o-rings.
Be sure you have sufficient lubrication. You should be adding pneumatic oil to the gun periodically. Perhaps it is time to replace the o-rings (kit available for around $20). I have also needed to replace the trigger assembly once on my gun. This is about $40 for the replacement part.
prolly clogged, buy a rebuild kit and use it making sure all parts are totally clean before reassembly. in the future be sure to drain your compressor at least daily after use (more on wet or humid days) to avoid this
You have a crumbled trigger seal. You can order a new trigger valve through bostitch. It usually takes a couple of weeks though.. Every time I order one it is on backorder. You will need to order trigger valve kit part number TVA11 $21.40. Go to the Bostitch website click on Schematics and Parts to the left then find your model nailer in the search field and select item 53 when the parts list comes up. Click add to cart to order. Another screen will pop up and ask you if you want to checkout. Any questions please post back.
Yes your nailer will drive other sizes of nails. For info and parts go to www.bostitch.com and look for the support tab then select service parts. Here you will find parts list and manual. To remove the tva11 trigger valve remove the retainer pin (the pin is 3mm) for the trigger and remove trigger. Next remove roll pin/pins that retain trigger valve. Use heavy glove to catch trigger valve as you apply air pressure to gun. The valve could pop out with great force so try lowering the pressure to gun. Before installing the new valve, check the opening for sharp edges which will cut orings. Good Luck and email if you have more questions.