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Hmmm... now you've got me thinking about a length of fuel line outside of each bowl on my carbs. Fitting at top of bowl, fitting at bottom, length of clear line between.... like a 70s chopper "fuel gauge"...
You can put a fitting in the nut that holds the bowl onto the carb and leave the other end of the clear line open, as long as it is above the top of the bowl.
Aircraft carbs have a drain fitting. I use that for a hose barb and some clear tubing. Makes seeing the float adjustment a walk in the park.