Zenith float height measuring ?

[Allenk]

So I'm finally making progress on a very long project and have the 2.2 back in and running. I was working to make the float heights correct using the glass gauge sold by our host and have an interesting issue. It seems no matter what size copper washers I use, the liquid level in the gauge stays the same. Funny thing is, if I use too thick of a washer the bowls will definitely overfill and fuel will spill into the throttle body so I know the fuel level is changing. Anyone have any thoughts? Is the gauge only good for webers for some reason?

[itsa6911]

I recall the float guage's "banjo-fitting"for Weber carbs do indeed screw in too far on Zeniths,
you can see this with the top cover removed, you will see it bottom out against the Float when screwed in...and usually before it seals.
I believe the "Weber" guage fitting is longer, and "Zeniths" require a shorter guage fitting for this reason.
Either source the proper shorter Zenith fitting(Recomended), or try and shim the guage depth with a thicker o-ring, shims, or remove guage fitting depth untill it seats,seals, and allows free float movement,
BUT WARNING: BE CAREFUL OF LEAKING FUEL ON RUNNING VEHICLE !!!!

[ddubois]

I can confirm this is a problem. It protrudes into the bowl too far and stops the float from rising and thereby closing the valve. I put a standard washer between the float gauge and bowl and that solves the problem.

[Allenk]

Cool thanks......

I'm assuming everything else about the gauge is accurate? The gauge I have has 2 sets of lines, one lower set close together(1m), then a space of about 2cm then another set. I'm assuming the lower set is too be used based on the the Haynes manual for making this tool.

[kkinzli]

I had a similar problem with the needle valves on my zenith. Regardless of washer size the bowls kept overflowing. Turned out that my fuel pressure was too high and I needed a regulator.

[Allenk]

The pressure shouldn't be an issue. I'm using an Aeromotive return style regulator set at 3psi.

Thanks