Why the roller on top of the float?

[johnbuckley]

Why is there a roller on the top of Zenith floats? ...... ( I know it's useful to change the weight but what the real reason?)

[1930 coupe]

It is a weight, Ford weighed the floats and added weights as needed.
Small variations in weight can make a large change in fuel level.
I have had to add these weights to some reproduction floats to get the fuel level correct.

[Will N]

What is the correct weight for a float please?

[1930 coupe]

Originally Posted by Will N

What is the correct weight for a float please?

31 grams plus or minus 1/2 gram

[alexiskai]

31.4-31.8g

http://www.fordgarage.com/pages/ZenithAfloats.htm

[Will N]

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Thanks you!

[johnbuckley]

yes, Ford Garage http://www.fordgarage.com/pages/ZenithAfloats.htm is an interesting page on floats. But it's not just weight that counts .... fuel level in the bowl will also be changed by the float dimensions being different ( a slightly wider float (displacing more fluid) - and they are not all absolutely accurate dimensions -will float higher , sealing the valve at a lower fuel level). Also the head of fuel difference between full and empty tank will change the bowl fuel level - small print I know...I'm sure dear Archimededs didn't realise we'd still be thinking about him 2000 years on.