Zenith questions

[mycar]

Hello Simon, I wouldn't bother with the float level gauge. As it was pointed out to me in an earlier thread, you have to take the top off the carb to make adjustments anyway so you might as well measure the level with a digital caliper.

This sort of thing, pretty cheap on ebay and comes in useful for all sorts of fine measuring once you've got one.



Instructions for float level adjustment halfway down this page.

https://porsche356registry.org/article/46

I can report that my Zeniths are now leak free.... but I still turn the petcock off whenever I remember.

[POR68]

Like others I tried various part-fixes. Then I pulled both carbs and went through the whole process with lots of sound advice from Ron. New kit and jets and lots of cleaning. The key point for me was re-establishing the correct angle on the brass bracket (platen) that shuts off the float valve. Then using Bruce Smith's float level gauge to set the levels correctly. I found that gauge extremely useful for testing the carbs, when fully assembled and even on the car. The fuel cock shut off is also important in my view and have several benefits (theft deterrent included).

[BD55]

Ok so I went through the rebuild procedure and carried tests out on the bench as per Mike's instruction and so far so good no leaks. I did use Loctite 230 sparingly on the aux venture's, and jet cover screw.
I ended up setting the float levels to the bottom end of the scale i.e. slightly higher than 19mm from top of carb body. When I first set the float switch at around 18.5mm thinking more fuel is good, I had fuel dripping out of the emulsion tube down into the main venture.
I did preset the platen and floats but i'm guessing I may have this slightly out, if I get migration at the 18.5mm.... I will see if I get any problems in the future.
I do think my original leak was from the jet cover seal, there was fuel on the tinware, making me think it was the throttle bodies

One thing I didn't find out was the orientation of the emulsion tubs in the aux venturi's, does it matter where the holes sit in relation to the body??
Big thank you for all the advice!