As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR - FLT 4254 - CREW REPORTED STRONG ODOR OF GAS IN COCKPIT WHEN APU STARTED IN AIR. NO ODOR WHEN STARTED ON GROUND. MAINTENANCE PERFORMED OPERATIONAL CHECK OF APU REFERENCE TO EMB145 MM 49-00-00. OPS CHECKED GOOD. LEAK CHECKED GOOD. (M)