Just got done replacing the leaky fuel regulator. Ran pressure test with the gauge at the test port and this is what I'm getting:

Pump on: 64psi
Pump Off: 52psi
10 min: 40psi
Not happy with these numbers.

I put a vise-grip on the return hose near the fuel filter and these are the numbers:

pump on: 80 psi
pump off: 76psi
10 min: 62psi
Not thrilled with this either.

I re-clamped the hose and did the test again and saw about the same. I've got the 6 spider hoses pulled and no visible leaks in the intake. Nut kit, new regulator and the test port are bone dry. I replaced the pump less then a year ago with a new Delco.

Is there such a thing as an aftermarket check valve that can be installed with the fuel filter?
I haven't tried to build the fuel filter adapter to connect the pressure gauge, is it worth doing since the upper intake is apart?
Any suggestions what should I do next?

Getting discourage... :-(

 

I don't think the leak down is so bad to cause an issue with starting. To what pressure does it build to, during the FIRST 2 sec pulse AFTER SITTING OVERNIGHT and turning the key on (without cranking the engine). Leave the gauge on overnight and have it ready to read. I suspect the fuel pump (and yes I know it's only a year old).

Never block off the return line on these systems. If you have a good fuel pump the pressure which should be more than 80 psi will likely rupture the fuel pressure regulator.

Good luck and best wishes for a successful repair.

 

Thanks I'll recheck and assemble the fuel filter adapter for the gauge.