NHTSA Complaint #11708574 — 2016 MERCEDES-BENZ METRIS

Fuel smell in the engine compartment and visible leaking fuel on the lower hoses per NHTSA Campaign Number 18V837000. I previously complained about this in April 2025 (ID 11669847). Dealer inspected in April 2025 and replaced the lower hose, but I still would smell fuel. After a lot of my own troubleshooting over the last six months, I have determined that when the car has sat un-used for over 24 hours, the rubber fuel lines shrink just enough that the next time the fuel system is primed (pre-start routine when you unlock the car, or start the car), a small amount of fuel leaks out at the connection. If the car sits for weeks and then you start it up, fuel will visibly leak out of the rubber connection (I have video). Once the rubber line swells up again due to the fuel in the line, it will slow the leak. So, if you use the car daily, you will be less likely to notice a leak. If you use the car infrequently, you will be more likely to have a leak.