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

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The air is escaping from the end cap and it will not fire a nail

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You nailer is very easy to repair. Remove the head and replace the cylinder seal and other parts (including the cylinder spacer, white plastic ring around the cylinder) as needed. If the seal is not split, clean and lube all parts with silicone paste lube and retest. You can order parts from www.toolpartsdirect.com if you like to order off the web or contact your local Dewalt repair center.

Posted on Oct 18, 2011

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When i connect the air it sounds like all the air is escaping.


depends on where air is escaping from. If it is around the trigger then you need a new trigger valve (I have detailed instructions in the tip section on repair) If it is leaking thru the cap you have a pinch o ring or stuck firing valve. Let me know exactly where air is leaking and I will try to pinpoint the problem for you.

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take the head bolts out of the top of the gun. make sure you pay attention to how everything comes out so you can put it back together.

shake the gun upside down so that the piston comes out. wipe everything down with any petroleum based cleaning solvent to remove all the gunk and reassemble.

pour about 10 dropsof oil down the air input, let it sit there about 5 mins and hook up the air and it should work

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1 Answer

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I found your post a couple times, when you remove the nails does the piston/driver slowly come down? Also do you hear any air leaking around the cap? When was the last time you had it serviced. It sounds like the o rings are dried out or worn flat and possibly a seal on top of the cylinder might be damaged. Not to worry though, it is rather inexpensive to repair all that yourself if you are handy with tools. Let me know and I will find a breakdown for you before you attempt anything

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