When you changed the fuel filters, did you run the hand primer pump about 100 strokes to force fuel through the system?

This pump is on the driver's side of the engine, down low on the block. You can see the fuel hoses going into the lift pump right near this primer pump. It's usually a clear plastic device with a plastic plunger handle. Sometimes, when very old, it leaks like hell and needs to be replaced with the newer design.