FLtractor 108 #1 Posted Saturday at 10:48 PM (edited) Evening, I put a brand new L shaped Fuel valve on bottom of my 856 factory fuel tank.. it no longer leaks near what old valve did but the metal nipple nest hose will be wet with fuel.. not dripping, just wet valve outside.. any suggestions on a grommet or gasket around the valve inside tank to help stop said leaking? Should tank valve be all the way open when running driving tractor? Or just certian # of quarter, half, full turns? Edited Saturday at 10:49 PM by FLtractor Share this post Link to post Share on other sites
ri702bill 10,885 #2 Posted Sunday at 12:08 AM Did you use any fuel resistant sealer on the threads?? I prefer Permatex #2. Opening about 2-1/2 turns should be fine. As I recall - not all valves have a built-in stop to prevent you from removing the stem entirely - by accident! 2 Share this post Link to post Share on other sites
sqrlgtr 1,691 #3 Posted Sunday at 12:30 AM I use gas resistant Teflon tape, available at auto parts store and usually yellow in color. Just have to be careful and not contaminate fuel line with it. I'm not really following where your leak is, got any pics. 1 Share this post Link to post Share on other sites
Achto 30,407 #4 Posted Sunday at 12:54 AM I have switched to using anaerobic sealant on threaded fuel & oil fittings. I've had much better luck with it. 1 Share this post Link to post Share on other sites
FLtractor 108 #5 Posted Sunday at 02:40 AM (edited) No did not use any sealant or tape on the threads when I installed it. No current pictures. So between Teflon, permatex 2 and anaerobic sealer recommendations.. any one stand out as better performing for leak stoppage or all the same result just pick your favorite ? Edited Sunday at 02:42 AM by FLtractor Share this post Link to post Share on other sites
kpinnc 16,460 #6 Posted Sunday at 05:23 AM 2 hours ago, FLtractor said: So between Teflon, permatex 2 and anaerobic sealer recommendations.. any one stand out as better performing for leak stoppage or all the same result just pick your favorite ? As a rule I prefer not to use tape on anything that carries oil, but I have used it in fuel lines. Just be sure to allow a thread or two at the edge to be free of tape just to keep it out of the system. Liquid sealers work best in my opinion, but the same rule applies to keep it out of the tip so if doesn't get into the lines. 3 2 Share this post Link to post Share on other sites
sqrlgtr 1,691 #7 Posted yesterday at 11:44 AM On 1/4/2026 at 12:23 AM, kpinnc said: As a rule I prefer not to use tape on anything that carries oil, but I have used it in fuel lines. Just be sure to allow a thread or two at the edge to be free of tape just to keep it out of the system. Liquid sealers work best in my opinion, but the same rule applies to keep it out of the tip so if doesn't get into the lines. On 1/3/2026 at 7:54 PM, Achto said: I have switched to using anaerobic sealant on threaded fuel & oil fittings. I've had much better luck with it. What liquid sealant are you all using. I have been using the tape for years with great luck, but the liquid has to be easier to apply. You know one of them work "smarter not harder situations." Share this post Link to post Share on other sites
Achto 30,407 #8 Posted yesterday at 12:39 PM 54 minutes ago, sqrlgtr said: What liquid sealant are you all using https://www.napaonline.com/en/p/PTX51817 1 Share this post Link to post Share on other sites
sqrlgtr 1,691 #9 Posted yesterday at 02:50 PM 2 hours ago, Achto said: https://www.napaonline.com/en/p/PTX51817 Thanks, I hadn't ever thought about using a gasket maker for fuel fittings before. I think I will stick with the tape though, I usually end up with the gasket maker all over everything time I get done . I guess this goes without saying but the Teflon tape has to be gas resistant don't ask me how I know. . 2 Share this post Link to post Share on other sites
