Engine/Transmission (1998.5 - 2002) how slow can a lp die?

[THenningsen]

seems over the past several months my fuel pressure has dropped slightly. It is now 11psi at idle and 7psi running 90 on the interstate. I changed the fuel filter and expected it to come up a little... 14 at idle and 10 at wot. Could this be my lift pump? I figured that when they died, they would go quick.