Ive got 2 lines running the frame rail, how do I identify which is the flow line and which is the return line, and which line on the intake is the flow line and which is the return line? is the Shrader valve on the flow line?
If you look at the couplings where the soft lines go to the hard lines one coupling is bigger - this is the supply side. You might have to measure to tell because there isn't a huge difference. Hope that helps.
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