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Re: Fuel tank issues

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Dave Wave

06-29-2013 13:54:15

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I did get the bowl from him. I will put some sealant on it and give another go. I guess we can add Turkey to the list of the land-of-not-quite-right.

Thanks again for all the help!


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06-29-2013 17:43:15

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 Re: Fuel tank issues in reply to Dave Wave, 06-29-2013 13:54:15  
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You are operating under a bunch of misconceptions and confusing a bunch of different thread specs . If the tank is tapped for 3/8 STRAIGHT pipe threads as described by the seller (NPSC or NPSF) a 3/8 NPT pipe thread will start and "bind" after a turn or two just as you describe.


It is not almost right - it is dead on right and exactly how the ANSI pipe thread specification specifies it should work. The interference between the straight threads on the tank and the taper threads on the tap is what gives you a pressure tight seal. If you run the tap in deeper you will ruin the NPSC/NPST threads in the tank and potentially compromise the seal. Leave it alone!!!

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Your measurements on the old sediment bowl are consistent with 3/8" NPT threads just as Hobo told you. It should screw into the new tank just like the tap. If it does put some sealant on the threads, run it in hand tight, and then use a wrench to tighten it 1 -2 turns more just until it is at the correct orientation.

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Dave Wave

06-30-2013 14:04:06

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 Re: Fuel tank issues in reply to TheOldHokie, 06-29-2013 17:43:15  
Well I lubed it up with some dope and got it started. It bound up at about 1/4 of a turn. Thinking about what TOH and the others said, I put the wrench on it and started turning it in. Much to my surprise, it did not strip out. It made it about 1 1/2 turns and was getting pretty stiff, so I left it there. I added some gas, and so far no leaks.

So far, so good.

This is one strange thread setup. It felt exactly like the threads were crossed.
Thanks for all the help and explanations!


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