Summershandy Posted June 3, 2018 Share Posted June 3, 2018 This may be a dumb question. I have a drain plug for my tank. Tank's been refurbished and before it was, there was a light leak at the plug. It didn't have a washer when I removed it. I've since installed a new washer for oil drain plugs. Can't really find a "fuel" drain plug gasket. It's a good fit but will it survive fuel exposure? I'm not sure of the make of washer. Seems hard fibre and came in a box of various styles which I used for my oil pan and tranny. I picked the one that fit best. Thanks! Link to comment Share on other sites More sharing options...
Bloo Posted June 3, 2018 Share Posted June 3, 2018 Hard fiber is used on carburetors for various things, like Carter BBD float valves, for instance. It should be fine. If not, try a copper washer. I don't know what was used originally. Maybe someone else in here does. 1 Link to comment Share on other sites More sharing options...
Friartuck Posted June 3, 2018 Share Posted June 3, 2018 My first choice would be copper with a smear of sealer. Hard Fiber should be acceptable. Link to comment Share on other sites More sharing options...
Summershandy Posted June 3, 2018 Author Share Posted June 3, 2018 I couldn't find copper with a good fit. Never thought of sealer. Guess I wouldn't have to ever drain the tank for a long time. If I do start developing a leak I could seal it. I'm still curious if oil and fuel material have the same resistance. Link to comment Share on other sites More sharing options...
Bloo Posted June 3, 2018 Share Posted June 3, 2018 58 minutes ago, Summershandy said: I'm still curious if oil and fuel material have the same resistance. Not necessarily, in fact usually not. I think fiber is a case where there is likely no difference, and you will be fine. I am extremely skeptical of any kind of sealer on gasoline, I think that is the road to madness. If it were me, and I had a fiber washer that fit nicely, I would put it on there, tighten it good, and not give it another thought. Link to comment Share on other sites More sharing options...
cahartley Posted June 3, 2018 Share Posted June 3, 2018 The problem with hard fiber is it''s SO hard it won't conform to the slightest irregularity the mating surface may have....... Link to comment Share on other sites More sharing options...
Guest Posted June 3, 2018 Share Posted June 3, 2018 How hard would it be to use a flat block and emery paper to ensure that the tank surface had no irregularities. You could do the same with a tube and emery paper or valve grinding compound on the plug. Link to comment Share on other sites More sharing options...
51dyno Posted June 4, 2018 Share Posted June 4, 2018 How about a Nylon washer , there are sealers supposedly for ethanol . I believe Loctite has one ?? 1 Link to comment Share on other sites More sharing options...
Curti Posted June 4, 2018 Share Posted June 4, 2018 Go to NAPA and get a copper washer . They are used on brake systems. Link to comment Share on other sites More sharing options...
plymouthcranbrook Posted June 4, 2018 Share Posted June 4, 2018 I used a good sized rubber o-ring on my 52 Plymouth and have never seem any leakage or problems on the occasions that I had to drain the tank Link to comment Share on other sites More sharing options...
Summershandy Posted June 4, 2018 Author Share Posted June 4, 2018 32 minutes ago, plymouthcranbrook said: I used a good sized rubber o-ring I have viton o-rings for the oil and tranny plugs. One plug even had a groove for it. The gas plug is flat so I stayed with flat. Link to comment Share on other sites More sharing options...
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