[aknovaman]

The regulator is just like a pop off valve on an air compressor. Most fuel pumps can supply 100-150 psi if you dead head them. So the pump runs, it pressurized the filter and rails to 60 psi then fuel pressure overcomes the spring pressure setting and dumps the unneeded fuel back to the tank. The feed is the 3/8 line. Go crawl under any newer Vette to see how it is plumbed. It makes no sense to have a bigger return than the feed line. As the engine uses fuel at any rpm like heavy acceleration, the pump will continue to provide fuel through the injectors and the relief valve closes enough to maintain 60 psi in the rail. So less is returned to the tank when the pop off closes to maintain 60 psi at all Rpm. I have had multiple Vette filters fail right out of the box including some wix filters.

I use the $21 eBay generic regulator and a TPI single in and single out filter. Works perfect every time. The regulator has a good neoprene diaphragm and a chrome check ball and good spring.