I changed the filter about 3k miles ago, but I noticed my fuel pressure (with my overly expensive NAPA fuel pressure guage) is just a hair under 40 at engine off-key on. Haynes says I need close to fifty psi...unrelated note, according to my gas guage I have horrible mileage (less than 16mpg hwy)..but I can drive an extra 60 miles or more after I hit E. I know the pump and float are a single unit, but my question is would a drop in pressure such as this cause the surging? It drives normally everywhere else, and she's got plenty of pickup without missing.