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I am running new fuel lines for a carbed 347. I was wondering what size fuel lines I should go with for supply and return. I am running an electric blue holley fuel pump. Any help?
 

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Discussion Starter #2
Would I be ok with using the stock steel lines and just coming off of them. It is in a 95 GT. I know I'm and idiot for carbing this car, but only option for me.
 

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No, you are running very low pressure, so you need a larger diameter tube to provide the volume. 1/2" is what most people use. Why do you need a return line for a carb with a blue holley pump? They are designed to be returnless.
 

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Discussion Starter #4
ok. Thanks for the help. I just seen most setups with a return. Just figured electric pumps should have a return.
 

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I ran 8AN from the the Blue pump in the back to a non return regulator in the front. I ran dual 6AN from the Reg to the carb inlets. Works Good!
And If I plan on going bigger with a return sytle regulator I would use the 8AN for the return and 10AN for supply.
 

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Unless you're going to make 500+, you're ok with 3/8" (-6), but you can't go wrong with going bigger. When it comes to fuel line, it really can't be too big. I ran -8 on mine.
 
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