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Welcome to the club Bertram. X2 on the FP regulator. It doesn't matter that the regulator is after the pressure check valve. If it's open (faulty) & allowing full flow to return, it won't show any pressure on your guage.

**edit,, to clairify... if your press regulator was before your press check valve for the guage, then you would effectively be measuring the return pressure rather than the supply pressure.

This could also be what Crispyt has posted, but like he said it is rare, & since your pump is putting out like a fire hose I would save that for last cuz it's a pita to access the fuel pumps.
 
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