EMB ERJ 170/175 ER/LR
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Human Factors; Procedure
We arrived to the aircraft at our departure gate. It was powered down. We powered it up and began our duties. The fueler arrived and put in our required quantity. We boarded up and I noticed that the fuel door was still indicating open. I asked my FO (First Officer) if the fueler was still there and he said; 'No; he had gone but the door was still open.' My FO was taller than me so I asked him if he could go and close the door. He did.We departed and arrived at our destination with no issues. I handed the aircraft over to the new Captain and as we were waiting on the FA's (Flight Attendants) his FO (actually a check-airman doing Capt IOE) came and said that the fueler reported the fuel cap was missing. We had flown all the way with no fuel cap.Although it's not required to be checked on this aircraft during preflight my FO did not notice the fuel cap was missing when he went to close the door. The door is normally closed and we cant see the cap. The fueler had fueled the aircraft and just left with the door open and no cap. He did not inform anybody that there was an issue with the aircraft. He just left. If there is an issue found with an aircraft; either by a ramper or fueler or [other]; the flight crew need to be informed; and if they are not there then a supervisor or at least a note needs to be left so that the flight crew are informed before the flight departs. We were there. The fueler knew the aircraft had no cap; and he let it depart.
ERJ-175 Captain reported that after handing aircraft over to new crew; the new First Officer reported the fuel cap missing from the aircraft.