Today, I was ready to install my new sediment bowl on my '50 cub. It is a Steiner Sediment Bowl purchased through Jason at DuFour Tractors, and has the L-shaped lever. It has a large knurled knob to secure the bowl, rather than the fluted original ones, but otherwise looked OK. It also came with the break-away ferrule fuel line fitting, which was nice. The bad part is that instead of the brass mesh screen, it came with the plastic-framed white one. I was skeptical about it, but decided to try it. Oh, and it has the rubber gasket...I have had good and bad results from both the rubber and cork gaskets, so decided to leave that, too.
Note: until I have everything done on this tractor, and am sure I don't have to remove the hood for a while, I have installed a barb on the sediment bowl and will use a rubber fuel line to a barb installed on the carb. Later it will be replaced with a proper steel fuel line.
I decided to try a new way to test it, though. I dug out a very small funnel I have, which fit perfectly into the inlet. With the fuel shutoff valve closed, I filled the funnel with water. It worked perfectly...not a drop of water passed into the bowl.:
- Fuel valve closed
Then I opened the valve, and water came right down into the bowl.
However, as I added more water to the funnel, filling the bowl, the bowl gasket began leaking. I opened it up, and the first thing I noticed when I removed the gasket, was that the impression in the filter side of the gasket was not symmetrical. This may have been due to the bail being off-centered when tightened, or the screen itself not being centered...not sure.
- Uneven bowl impression, on the filter side
But the next thing I saw after removing the screen was that its outside diameter was almost equal to the gasket, and was relatively quite thick, which I think prevented sealing.
- Too thick and diameter is too large, IMO
So I grabbed one of my new brass screens from Steiner's:
- Steiner's brass screen vs plastic screen
The problems I have had with this group of screens from Steiner's are that they are not cut symmetrically around the center hole, and the diameters are slightly too large, keeping the gasket from sealing. So I trimmed this one down before installing it.
NOTE: The markings are not mine...they were already there
- Not perfectly centered, but with enough room for the gasket to seal
After reassembling it, I did another water test, and no leaks!
Now to put it on the tank, and see if I remain lucky!! 
