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I am wondering which top I should use on the float chamber on my 1 1/4" SU. I have two. One has the overflow going to a outlet pipe, which I think would then have to go back to the fuel tank, and the other one I have has an inlet and the overflow just comes out the top. Which one is better, because I would prefer not to run a pipe all the way back to the fuel tank if I can avoid it. I am using a mechanical fuel pump. Any pointers?

Heres pictures of both tops:
 

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on my twin s/us i run a pipe off the o/flow into my 32 that goes into a jack danials bottle,that way i can see if the carbs over flow and fuels not pouring over a hot engine.
 
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