Yes the fuel lines is 3/8 and the return line is 5/16 and they are both high presure lines and if you go to napa you can order both line at about 25 to 30 a line i went to the gmc dealership and they want 250.00 per line napa will order them idf you need part # e mail me and i can send them to you ....
Theres a pressure and a return, the pressure line is ALWAYS the larger of the 2
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