I still have the stock fuel rails and pressure regulator. Saturday I decided to check the fuel pressure, with KOEO I get 10psi and with engine run I get 38 psi with the vac connected 42 without vac. AllData states pressure should be 35 to 45 with KOEO and will vary 5 psi with engine run. After I turn the engine off the pressure slowly bleeds down to 10 psi and holds. Is this a pump issue or regulator issue ?