I bought an Holley Blue fuel pump and regulator. I need to get the right size fittings for the stock fuel lines the inlet and outlet size on the regulator is 3/8". Does anyone know what the fuel line sizes are? so I can get the right size fittings to connect to this regulator.

 

I think they are 1/4"?

 

5/16

 

which is it?

 

never measured it myself, but i've always bought 5/16

 

so the bluew holley pump and regulator uses 5/16 fittings to connect to stock fuel lines?