Fuel line size

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   I recently put a Weber 32/36 on the 153 in my '47 2a. This led to a fuel pressure regulator and an an electric pump on a bypass to make the cold weather starts after it's been sitting easier.  I have one of those clear inline filters with the replaceable cartridge in line before the fuel pump. Now everything from that filter to the carb is 5/16" line, but the fuel line from the tank to the filter is only 1/4".  I notice an air bubble in the top of the filter which I don't recall before, and I'm wondering if that is due to the smaller diameter line from the tank?  Is there any issue with a smaller 1/4" line leading into the larger 5/16"?Seems to run much better than it did with the monojet, but it is harder to start when cold.

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BD1 Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 18 Dec. 2019 Location: Maine Status: Offline Points: 630	Post Options Post Reply Quote BD1 Report Post Thanks(0) Quote Reply Topic: Fuel line size Posted: 19 Mar. 2023 at 3:18pm
	I recently put a Weber 32/36 on the 153 in my '47 2a. This led to a fuel pressure regulator and an an electric pump on a bypass to make the cold weather starts after it's been sitting easier. I have one of those clear inline filters with the replaceable cartridge in line before the fuel pump. Now everything from that filter to the carb is 5/16" line, but the fuel line from the tank to the filter is only 1/4". I notice an air bubble in the top of the filter which I don't recall before, and I'm wondering if that is due to the smaller diameter line from the tank? Is there any issue with a smaller 1/4" line leading into the larger 5/16"? Seems to run much better than it did with the monojet, but it is harder to start when cold.
	BD '47 CJ2a, Shiny on top! '55 CJ5 project