B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 114; Flight Crew Type 89
Troubleshooting; Communication Breakdown
Deviation / Discrepancy - Procedural MEL / CDL; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Overcame Equipment Problem; General Maintenance Action
Aircraft; MEL; Procedure
After pushback and engine start; power transfer; the center fuel tank boost pumps low pressure lights were illuminated. QRH; then dispatch and [Maintenance Control]; maintenance fixed the problem; signed off the logbook entry and we departed.  Upon arrival at [our destination] we were informed that the maintenance procedure for fully clearing the issue may not have been done correctly.
On push back from gate and after engine start; and after the first power transfer (putting the generators on the bus) we noticed that both center tank low pressure lights were illuminated. We coordinated through dispatch and [Maintenance Control] and we were told that maintenance would come out and reset the UFIs (Universal Fault Interrupter) I think was the term in the equipment compartment. We were told to leave the pumps on; and maintenance came out to us on taxiway kilo; opened the equipment door and completed the procedure; and the lights extinguished.We then taxied back to the gate so maintenance could sign off the logbook; we were pushed back again; and we had an uneventful flight.Upon exiting the airplane there were three mechanics on the jet way; and they were curious about the center tank low pressure lights. We explained what was done; and one of the mechanics told us that; that particular procedure that was done [at the departure airport] is no longer allowed. The mechanics now have to 'diagnose the problem; and analyze some data; before anything can be reset';The Captain and I were concerned that an improper procedure was done to fix a maintenance issue.
A 737 flight crew reported experiencing a fuel tank boost pump pressure issue after pushback and engine start. Maintenance personnel resolved the issue at the aircraft; however it was determined later that an improper procedure was used to troubleshoot the problem.