As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF HAD ENG 1 LOW PRESS INDICATION. THE RELAY COULD BE HEARD BEHIND CAPTAIN SEAT GOING ON & OFF CONSTANTLY. PROBLEM WAS FOUND WHEN USING PUMP 1B ON NR 1 ENG. AIRCRAFT WAS REMOVED FROM SERVICE. R&R FUEL PUMP 1B IAW EMB 145 AMM 28-21-01. OPC AND LEAK CHECK GOOD MEL RESTORED.