Mine is still on the original lift pump and runs 16 PSIG at idle (pre-filter), dropping to 11 PSIG at WOT (down from 13 PSIG when new). I guess the lift pump's starting to get a little tired... . :{
Your pressures sound a little low to me - unless you're measuring post-filter with cold fuel. Since ULSD came out, my post-filter pressure is as low as 10 PSIG at idle on cold startup, only coming back to 14. 5 PSIG after 20-30 minutes of runtime.
Rusty