Question about Porter Cable-Cable FN250C 1-inch to2-1/2-inch 16 Gauge Finish Nailer

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Air leaks at trigger, gun will not fire - Porter Cable-Cable FN250C 1-inch to2-1/2-inch 16 Gauge Finish Nailer

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Bostitch just blows air when trigger is pulled


Air leaking from trigger when attempting to fire the gun is normal and should cause nailer to fire, however if the trigger pin is not depressed all the way in,the gun may not respond. Easy test. Remove the nails and remove the trigger. Connect the gun to air and quickly depress the valve pin all the way in with finger. If the gun fires, adjust the safety foot so that the trigger pin is depressed all the way in. If the gun still does not fire, then remove the head cap and pull out the headvalve. Apply plenty of white grease to orings and retest. If the gun fires, then replace the headvalve orings. When the headvalve orings are worn, air will leak from bulkhead chamber to the headvalve chamber causing the gun to not respond to the trigger. The addition of grease to worn orings will make them temporarily seal. Good luck

Jun 16, 2016 | Stanley Bostitch N66c1 114"to 212" Coil...

1 Answer

How to repair of air leaks out in the plug in of hand held air tools when i depressed the trigger


This problem occurs when the orings in the headvalve and/or trigger valve are worn or just needs lubrication. This also happens when the safety foot does not push the trigger valve all the way in. Easy test. Remove nails and air pressure. Remove the trigger exposing the firing pin on the trigger valve. Connect air and with a very quick motion, depress the firing pin all the way in. If the gun fires adjust the safety foot. If the gun does not fire, remove the head and pull out the head valve. Lube orings in head with plenty of white grease. Reinstall head and test. If the gun fires, time for oring kit or just keep applying grease. If the gun still does not fire, most likely problem is trigger valve orings. Good luck

Oct 13, 2014 | Air Tools & Compressors

1 Answer

Nail gun no longer fires. Leaks air around trigger when trigger depressed. It is in single fire mode.


You will have to take the gun apart and change the rubber o-ring gasket for the trigger mechanism..Go to a Home Depot or other contractor outlet to get parts or info...The gasket actually keeps the air from leaking so it will nail.

Oct 24, 2013 | Air Tools & Compressors

1 Answer

I have a Bostitch N80S stick framing nailer that leaks air from the trigger area. I replaced the entire trigger valve with a new single fire trigger to see if the old bump fire trigger was the problem


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

Apr 10, 2013 | Stanley Bostitch Nail Gun

1 Answer

I put a new o ring rebuild kit in my Bostitch N80 sb framing nailer. I replaced every o-ring (including the trigger valve assembly


If the new trigger valve leaks air when you connect the air supply, most likely defective valve or air is leaking past outer trigger valve orings due to debris in the slot or new orings were cut when the valve was pushed in. If air leaks when you depress safety to fire gun then most likely problem is in the head valve or safety foot is not pushing the firing pin all the way in. Easy test, remove nails and remove the trigger to expose the firing pin. Connect air and very quickly depress the firing pin all the way in. If the gun fires, adjust the safety foot as needed. If the gun does not fire, remove the head and check headvalve orings for good snug fit against the cylinder within the head. The surface were orings make contact must be very smooth and not too deeply worn. If you notice fine scratches remove with fine sandpaper. Reinstall head using plenty of white grease on all the orings within the head and retest. Good luck

Feb 10, 2013 | Stanley Bostitch N80CB Coil Framing Nailer

1 Answer

Gun is full of nails, but acts like it is empty (the plunger won't advance). You go to tap it with the trigger pulled, and it just does nothing. Seems like firing pin is not getting air or somet


If no air is leaking from the gun, take out the nails, remove trigger by removing 3mm hex head bolt to expose the trigger pin. With air connected and side door open so that you can see the feeder, quickly depress the trigger pin with finger. Gun should fire. If gun does not fire (only makes air sound at trigger) dissconnect airline, remove head and lube headvalve with white grease and reinstall. Test again. If ok replace trigger. If still no joy, replace trigger valve with new factory or generic (part # TVA6). If gun fires but does not activate the feeder claw, remove two 6mm hex bolts from front of gun and split apart upper and lower body and check white oring (part # 149885) Good luck

Oct 16, 2012 | Stanley Bostitch Rn461 Gun Coil Roofing...

1 Answer

I have a magnum air 33degree gun, i removed the head cap to replace blown gasket, when i put it back on the gun will not fire.


Check the alignment of the of the gasket in reference to the small hole on the sealing edge(gasket has four bolt holes and one vent hole). This small hole allows air to vent from the upper part of the head when you depress the trigger casuing the gun to fire. If the gasket seals the hole or if air is leaking past the orings in the head vale the gun will not fire. If you hear air leaking from trigger when you attempt to fire the gun, most likely orings are not sealing. Remove the headvalve and lube the orings. If no air leaks from trigger when your attempt to fire, vent hole blocked. Good luck with your repair.

Aug 27, 2012 | Magnum Air 8 10 Gauge Framing Nailer

1 Answer

GUN DOES NOT FIRE FOR SEVERAL ATTEMPTS--even though gun is pressed firm against work---just had unit serviced and trigger valve replaced-----any suggestions? thanks joel


Remove nails and remove trigger to expose trigger valve pin. Place nose of gun against rubber pad or old coiled up air hose to absorb impact of driver and with very quick and deliberate motion press in trigger pin. If gun fires, then problem is with safety foot not pushing trigger pin all the way in (or worn trigger). Make adjustment as needed or replace faulty parts. If gun still does not fire, then likely problem is with headvalve. If headvalve orings are leaking, gun will not fire. Test for leaking orings as follows. Remove head and remove headvalve, apply silicone paste lube (plenty) to all orings and where orings contact. Assemble and do test above. If gun fires then surface where orings contact is allowing air to leak(smooth with very fine sandpaper if scratched).

Mar 13, 2011 | Stanley Piston Driver Assy Bostitch N60fn...

1 Answer

Bostitch RN46 will not fire nail, only releases air when trigger is held and firing tip is touched to surface of material. Any ideas on what is wrong?


Gun will not fire if air is leaking past orings in head /headvalve or safety /trigger is not pushing trigger pin all the way into trigger valve. Test: Remove trigger to expose trigger valve pin. Remove nails. Place nose of gun against thick rubber mat or coiled rubber hose to absorb blow of driver. Very quickly and deliberately press trigger pin all the way in. If gun fires, safety foo or trigger is not pushing trigger pin all the way in. Make adjustments or replace worn parts. If gun still does not fire, remove head and pull out headvalve. Apply lots of silicone paste lube on the orings and the surface of the head where orings make contact. Reinstall head and test as above. If the gun fires then orings were leaking. Replace orings and sand any scratches on body of cap with very fine sand paper. Parts are at www.toolpartsdirect.com Good luck

Mar 06, 2011 | Stanley Factory Reconditioned Bostitch...

2 Answers

Air leaks arond trigger when depressed, but no nail fires.


Where does the air leak out from? If it leaks from the trigger DeWalt makes a trigger valve assembly part # 641006-00 list 8.89 BUT if it leaks from other areas we have to look into it deeper. If it is just the trigger valve let me know and I will give you instructions how to remove and install the new one.

Feb 05, 2009 | Dewalt Round Head Framing Nailer D51845

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