I looked at the msd pump and saw it was rated at 40 psi. From what I have read, the 5.3 needs about 55-63 psi. I have no idea if this matters much. I bought today a bosch 72 psi, 39 gph. I do not know if 39 gph is enough. I looked on the web for hours with no luck. Can I remove the vapor line and how does that effect things? I live in Lodi, Ca not far from you. Thanks, Alan