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.

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

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

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.

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

@Chi-town

@mb911

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

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?

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=&...t&p=1841822

1/4npt

Sorry for the mix up

My tank was just finished so good timingClick to view attachment

This fitting fits our tank.

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

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

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 #.

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.

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