Posted by TheOldHokie on June 29, 2013 at 17:43:15 from (71.176.179.102):
In Reply to: Fuel tank issues posted by Dave Wave on June 29, 2013 at 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.
THIS IS HOW IT IS SUPPOSED TO WORK.
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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