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Posted by: mb911 Jan 15 2019, 07:48 PM

I need to chase the threads on my tank where the fuel lines connect.. Anyone know off the top of your head? Need to order a die for it.

Posted by: wysri9 Jan 15 2019, 10:54 PM

Happy to be corrected but by my reckoning they are M18x1.0 - an unusual thread for sure!

Posted by: Chi-town Jan 16 2019, 12:15 AM

Tap the i.d. to 1/4 npt and lose the leaky stock nipples.

Posted by: mb911 Jan 16 2019, 06:48 AM

My only issue with that is the sock doesn't get used then and have figure out some sort of screen ahead of the fuel pump.

Posted by: bdstone914 Jan 16 2019, 07:14 AM

Not Correct. 1/4 NPT can be internally taped.

@http://www.914world.com/bbs2/index.php?showuser=22446

Posted by: bdstone914 Jan 16 2019, 07:20 AM

@http://www.914world.com/bbs2/index.php?showuser=9892

Ben,

I prefer the internal taping to 1/4 NPT and using a threaded fitting inside the nipple. The internal sock never made sense to me. Why trap the crud inside the tank. A simple visible external filter is better.
You will not get a common tap to work as ne of the nipples is too close to the seam.
I made one from a front 911 spindle nut. Others have found a Nissan spindle nuts has the same threads.
You can also grind down a thread file to file the threads. It is only the sock nipple that has the clearance problem.
I can send you a spindle nut if you want to clean up the threads. You need to grind down the ears. If you stay with the nipples and paper gaskets make sure you hone flat the sealing surface. It is only 1mm wide and must be perfectly flat to seal.
Bruce


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Posted by: mb911 Jan 16 2019, 07:53 AM

Well that maybe the way to go and just save some potential leaks. So 1/4 pipe tap or 3/8 pipe?

What fittings do you like to use?

Posted by: andys Jan 16 2019, 09:22 AM

Here's a link to one of my posts where I used the AN fittings. Hope this helps.

Andys

http://www.914world.com/bbs2/index.php?s=&showtopic=204625&view=findpost&p=1841822

Posted by: Chi-town Jan 16 2019, 10:12 AM

1/4npt

Sorry for the mix up

Posted by: mb911 Jan 16 2019, 11:16 AM

My tank was just finished so good timing

Posted by: Mike Bellis Jan 16 2019, 09:19 PM

This fitting fits our tank.

https://www2.cip1.com/ProductDetails.asp?ProductCode=C26-201-209-6

Posted by: Mike Bellis Jan 16 2019, 09:20 PM

This one too...
http://www.piersideparts.net/CB3288.html

Posted by: cary Jan 17 2019, 09:48 AM

Ben I'll find my chaser when I get out to my shop this afternoon.
It's a nut off of a Datsun. Hopefully I kept the Dorman part #.

Posted by: Bartlett 914 Jan 17 2019, 10:29 AM

I like the idea of using a 1/4 pipe nipple. You will need to ream out the hole to 7/16" for proper threading. I have wanted to install a drain valve and using 1/4 piping will make this easy. Twice now I have purchased bad gas (water in the gas) while some distance from home. This would make it fast and easy to drain out any water that may have settled to the bottom of the tank.

Posted by: mb911 Jan 17 2019, 11:25 AM

I threaded this morning to 1/4 pipe.. This Will simplify the system greatly.