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Z
I've never seen a sponge like that in any Stihl FS56 I have dealt with. This looks like and "oops" part that got in there
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Z
On this engine the one is steel and the other is aluminum. This is normal and the reason the colors are different.
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Z
My experience with Kohler Efi has shown fault with fuel pressure every time. Those fuel pumps are pathetic. Especially the after markets...