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Discussion Starter #1
Are the stock hard fuel lines 3/8"?
 

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It depends where you are talking about. The fuel pump has 5/16" QC fittings on it. I am not sure if the hard lines are 3/8 back there or not but the hard line from the fuel filter down to the steel braided hose by the oil cooler should be 3/8". The return should be 5/16" all the way from the tank to the regulator.
 
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