carburator floats

[CELSESSER]

Hey all,

What makes the floats collapse in on these Marvel-Schebler carbs?
If they are dry and not leaking and only slightly concave on one side do they still exert as much pressure on the fuel shutoff needle? Is this a reason for the fuel leakdown problem or are they by design not boyant enough to keep the needle valve closed tight enough on the seat?

Chuck

[Lavoy]

I don't know what causes that, but I have seen numerous ones that way. If not dented too bad, they will still work.
Must fuel leakage problems are with the needle and seat being bad somehow.
Lavoy

[brettjones]

I'd guess it's a heat issue from when they're brazed.

[Mace Canute]

Awhile back I came across an explanation someone had given for this....brass floats will be collapsed if water accumulates in the float bowl and freezes. It takes quite a bit of water to do this but apparently it does happen. The ice expands and pushes upwards against the float which it can`t go any higher so it collapses.