@Seppi72, My OER setup came the same way with an option documented that various configurations are available and what I received was the generic setup. Ideally dead heading with a fuel return at the regulator is most popular from my research. Pressure adj. is critical on OER. Not sure what Webber recommends. My two cents

@LeonV I agree with you about crush washers being better than teflon tape, but there is teflon tape designed for use with gasoline and oil, such as Gasoila YT70.

@LeonV that is a nice clean fuel rail setup!

@SteveJ , I was just about to post my own photo of my roll of petroleum-rated Teflon tape. I used this stuff extensively both in college and during my chemistry career.

1 hour ago, Patcon said:

@LeonV that is a nice clean fuel rail setup!

Cheers, thanks Charles! I'll have to redo it whenever I finally take the time to swap to the OERs I bought years ago. That'll also provide a good opportunity to shorten the adapter stacks that are currently feeding the hoses from the tees; it's on my fuel rail V2 wish list.

The concept was to make something functional but fitting the period aesthetic. I specifically wanted to keep a fuel return system to help keep the fuel cool and to also allow for backpressure regulation for controlling fuel pressure. The regulator is downstream of the carbs and so is able to quickly regulate pressure drops. It also allows me to run high flow fuel pumps without overwhelming the floats. Lots of wins here which gave me piece of mind and enjoyment in building it. :)

46 minutes ago, Seppi72 said:

@SteveJ , I was just about to post my own photo of my roll of petroleum-rated Teflon tape. I used this stuff extensively both in college and during my chemistry career.

Bob, to answer your original question, that sealing interface was designed for a crush washer. You will see them on every other triple-carb Z you ever come across.

You don't have to spend any extra money to make the crush washers work. O-rings and teflon tape are asking for trouble, to say the least. But it appears to me like you've already made up your mind... Did you call Pierce Manifolds to see what they have to say? They'll happily sell you fiber crush washers if the idea of using copper or aluminum is unsettling to you.

4 hours ago, Seppi72 said:

They are non-magnetic, so probably aluminum but with thicknesses around 0.90 mm how much "crushability" do they have?

The grief is that the carbs came with banjos set up for series fuel delivery: two T connectors and one single bent at 90 degrees so I had to get something for the parallel setup.

Sorry, missed this one... I see. So then all you need is three straight banjos and you're set. If Pierce can't hook you up, I'm sure you can source some from a hydraulic fitting supply shop. What fittings do other Z's use which have that same fuel rail?

Regarding how much "crushability" they have, the answer is "enough" ;)

A quick internet search reveals a few options, pick your favorite crush washer material ;)
https://www.pafclassic.com/en/products/weber-dcoe-dco-sp-dcnf-single-straight-banjo-fuel-union-kit?srsltid=AfmBOoq5ukUvhDXxnqqb_bqcpdGNw_3AcHT7iFfyKyzncsrh_GXfJ5VP

https://www.ebay.com/itm/354625889861

https://www.demon-tweeks.com/us/weber-straight-fuel-banjo-fsecua001/?srsltid=AfmBOookU9JLoE06bCn2KTkd4T8aJB8yfRU5JA9pgrHYypDIrSUrB9DT

@Seppi72 is using the JDM competition fuel rail. Factory Datsun competition rail with the same single barbed ends. Single line triple output. No return line.

Edited September 2Sep 2 by Yarb
Add pic

Thanks for digging up those options, @LeonV . I decided to go with the eBay fittings.

So, I got a set of "proper" banjo fittings with crush washers from Demon Tweeks. But how do I get them to crush? Is there some particular torque value I need to apply to the hollowed-out bolts or do I just get them finger-tight plus, let's say, a quarter turn??

Edited September 13Sep 13 by Seppi72

While both are called crush washers there are some that are hollow and actually crush and others that are flat soft washers that just seal crush. if that makes sense.