How do I test a fuel pump on a 1997 f150? The lean bank 1 and 2 is giving me fits. Egr valve, solenoid, and sensor already replaced. Plugs and wires too. The heater hose also blew off during this whole thing so since it over heated I replaced the oil and thermostat. Did the diagnostic test on the maf sensor, it's working properly. I'm lost and so is my dad and father in law.