just check pressure today
key on - 50psi, then drops to 5psi only seconds after...
running - 50psi +/-5 when revving it
key off - 5psi
Could this be the pressure regulator?
Mines doing the same - its a 2000 with only 95,000 miles
Haven't dug into mine yet - thought it would be the fuel pump or fuel filter. Keep us posted on what else you find.