The incoming power to the combo relay for the fuel pump is on terminal 88Y. The outgoing power to the fuel pump is on 88D. During starting the relay coil is pulled in by power on 86A. During running it is held in by power on 86B. The power to 86B comes from the switch in the AFM. The AFM switch gets its power from 88A on the relay. The coil for this relay is powered on terminal 86C. Check the voltages and see where you are losing power.