An engine control system having primary and secondary fuel tanks comprises
a fuel monitoring module and a transfer pump (TP) diagnostic module. The
fuel monitoring module determines a measured fuel level of the secondary
fuel tank based on a fuel level signal received from a fuel level sensor
when a fuel TP is on for greater than a predetermined time period
required for the fuel TP to reduce the measured fuel level from a
predetermined fuel level to below the predetermined fuel level. The TP
diagnostic module diagnoses a condition of the fuel TP based on the
measured fuel level.