Narrative:

After pushing back from the gate and starting engines; we got a bleed 1 fail message. We then ran through the QRH procedure; but the message persisted. We contacted maintenance and were able to MEL the left engine bleed. The MEL required us to take off with the APU running. After completing the required paperwork and getting a new release we began our taxi to runway xxr. Just after rotation on the climb out I began to smell fuel rich exhaust; similar to taxiing close to another aircraft. The smell became fairly strong; but not uncomfortable and in my mind attributed it to having the APU running and sucking in the exhaust from the engines. I didn't think much of it and continued to accelerate and clean up the aircraft. I asked for the autopilot on; and by this time I noticed the smell began to dissipate as we accelerated to 250kts. The captain and I then discussed what could have caused the smell and we came to the same conclusion that we were probably sucking in exhaust due to the APU running and providing bleed air for the #1 pack. By the time we got to 3500/4000 ft the smell was completely gone. We considered it safe and continued on. The captain reviewed the QRH procedure for smoke; fire; fumes; and climbing through 10;000ft he contacted the #1 flight attendant. He informed me that the #1 had smelled it too; but quickly dissipated and that the #2 in the back of the aircraft did not smell anything. We continued to ZZZ1 and landed uneventfully. We then took the same aircraft to ZZZ2 with no complications.

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Original NASA ASRS Text

Title: ERJ-190 Captain reported 'fuel rich exhaust' fume shortly after takeoff which dissipated by 4;000 AGL altitude. QRH procedures were reviewed before completing an uneventful flight.

Narrative: After pushing back from the gate and starting engines; we got a bleed 1 fail message. We then ran through the QRH procedure; but the message persisted. We contacted Maintenance and were able to MEL the left engine bleed. The MEL required us to take off with the APU running. After completing the required paperwork and getting a new release we began our taxi to Runway XXR. Just after rotation on the climb out I began to smell fuel rich exhaust; similar to taxiing close to another aircraft. The smell became fairly strong; but not uncomfortable and in my mind attributed it to having the APU running and sucking in the exhaust from the engines. I didn't think much of it and continued to accelerate and clean up the aircraft. I asked for the autopilot on; and by this time I noticed the smell began to dissipate as we accelerated to 250kts. The Captain and I then discussed what could have caused the smell and we came to the same conclusion that we were probably sucking in exhaust due to the APU running and providing bleed air for the #1 pack. By the time we got to 3500/4000 ft the smell was completely gone. We considered it safe and continued on. The Captain reviewed the QRH procedure for smoke; fire; fumes; and climbing through 10;000ft he contacted the #1 flight attendant. He informed me that the #1 had smelled it too; but quickly dissipated and that the #2 in the back of the aircraft did not smell anything. We continued to ZZZ1 and landed uneventfully. We then took the same aircraft to ZZZ2 with no complications.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.