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Brass into plastic threads leaking?
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Originally posted by squirrel View Postwhat size is all this stuff? Is it 1/2" pipe thread? and 3/4" ID rubber tube? could you go to AN lines?
I'll need a total of about 2 inches of thread on the bulkhead to pull this off and just ciphering on the photo of that bulkhead it'll be a mighty close fit in length. I asked Dan in a post above, how do I hold the nut on the inside while I tighten the one on the outside or will I need to hold it after it starts going together?Charter member of the Turd Nuggets
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holding the nut is fun....I put one in the gas tank on my 62 Chevy II, but I forget how I did it.
I think getting the thread length you need would be difficult.
Also, have you closely inspected the tank to see if there are any cracks at the threads?
and have you tried any other NPT fittings in the hole, to see if they will get tight? It could be the hole that's bad, or it could be the fitting threaded into it is not the correct size.
My fabulous web page
"If it don't go, chrome it!" --Stroker McGurk
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Originally posted by squirrel View Postholding the nut is fun....I put one in the gas tank on my 62 Chevy II, but I forget how I did it.
I think getting the thread length you need would be difficult.
Also, have you closely inspected the tank to see if there are any cracks at the threads?
and have you tried any other NPT fittings in the hole, to see if they will get tight? It could be the hole that's bad, or it could be the fitting threaded into it is not the correct size.Charter member of the Turd Nuggets
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Originally posted by anotheridiot View Postthere is always mcmaster to go full brass and get the NPT to AN, (or 37 degree flared fitting) in their terms.Charter member of the Turd Nuggets
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AN and 37 degree flare are different animals...they don't mate.
Take the brass fitting to the hardware store, see what size of pipe it matches. It's probably 1/2" but since I can't tell exactly what size everything is in the picture, I'm just guessing. Buy some other fitting with that thread size, then see how it fits the tank.
My fabulous web page
"If it don't go, chrome it!" --Stroker McGurk
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That does look like 1/2" pipe thread.
If the plastic is worn away or distorted, then you'll not likely get the threads to seal again.
A -10 AN fitting would go through the hole in the tank if you drilled it to 7/8". -12 is 1-1/16" and is probably too big to fit. And then the problem of fitting nut inside, and the additional problem of giving it a flat surface for the washer to seal to.
Doesn't look promising.My fabulous web page
"If it don't go, chrome it!" --Stroker McGurk
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Originally posted by squirrel View PostThat does look like 1/2" pipe thread.
If the plastic is worn away or distorted, then you'll not likely get the threads to seal again.
A -10 AN fitting would go through the hole in the tank if you drilled it to 7/8". -12 is 1-1/16" and is probably too big to fit. And then the problem of fitting nut inside, and the additional problem of giving it a flat surface for the washer to seal to.
Doesn't look promising.
Flying south, with a flock of bird dogs.
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use metal to plastic 2 part epoxy. I dug around in my glue box last night but didn't find the exact stuff.... but with the threads on the fitting plus what remains of the threads in the container.... it should bond just fine.... pictures later...I wanted to do the wrench/nut bulkhead fitting but because the depth of the tank and obstructions, I couldn't.... the epoxy has been there, and in the sun, for at least a couple years... still water tight.Doing it all wrong since 1966
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I'll throw my in, although this is not my field of knowledge, first considering the weight of the fitting, why not go with a plastic fitting with the yellow tape or with the o-ring idea. Either way it would take the weight/vibration out of the equation.Pt 2010, Long Haul 2011,12,13,14,15,16,17, 18, 19, 23
If you wait, all that happens is that you get older
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the weight of the fitting isn't the issue...it's the pull from the hose that's attached to the fitting.
The epoxy trick, that SBG brought up again, still looks to me like the thing to try.
My fabulous web page
"If it don't go, chrome it!" --Stroker McGurk
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also, teflon tape is more of a lubricant than a sealer. It allows the threads to get really tight, so they can seal. Do some research, see if I'm wrong (I could be)My fabulous web page
"If it don't go, chrome it!" --Stroker McGurk
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