Not a 370z, but... VQ35HR ST (VSR) Begins

phunk

There must just be a burr on the thread or something, its all compatible stuff, it will fit.

Aeromotive 13109 regulator, Walbro 255 pump (gss342) is good for up to 500-550rwhp depending on many other things. Or you can use an Aeromotive 11142 which is the largest I would recommend for that fuel pump housing.

Before any of it, I would pressure test the fuel pump module but applying roughly 60-75psi of air pressure into the fuel pump module outlet, and this would allow you to check for leaks around the regulator delete or the fuel pump output barb, or cracked housing etc.

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