As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A TRAINING FLIGHT THE PILOT REPORTED A FUEL SMELL IN THE COCKPIT WHEN THE HEATER WAS ON. HE SHUT OFF THE HEATER & REPORTED THE DISCREPANCY TO MX. SECURED THE B NUT AT THE HEATER FUEL NOZZLE. OPERATIONAL & LEAK CHECKS WERE PERFORMED WITH NO DISCREPANCIES.