# Service bulletin LI47.10\-P\-079604

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11021969
- Published by NHTSA: 2025\-08\-19
- Manufacturer's number: LI47.10\-P\-079604
- Manufacturer's date: 2025\-08\-16
- NHTSA component: FUEL/PROPULSION SYSTEM

## NHTSA's summary

Complaint: Audible "slurping" operating noise from the fuel tank Cause: Conditions: The fuel tank is around half full The secondary chamber is almost empty. The suction jet pump suctions up small quantities of fuel and air. This results in vibrations and turbulence, which make noises. These noises may sound like slurping. The fuel pump and the drained secondary chamber amplify certain noises which can be loud or shrill. The viscosity of the fuel and the intensity of the fuel pump also impact the noises. The fuel level is in the area of the saddle overflow in the primary chamber. The fuel mixed with air flows back into the secondary chamber. The noises may therefore be audible for longer If the primary chamber is no longer in the area of the saddle overflow, the noises should disappear because the secondary chamber no longer receives fuel. The area of the saddle overflow in the primary chamber is around \+/\- 2 liters of fuel volume \(fuel gauge shows around half full\). Remedy: Refill/drain approx. 5 liters of fuel; if the noise is reduced/is no longer present due to this, the circumstance specified above is present Further measures may cause a reduction in noises in the specified area: In isolated cases, a fuel tank installed under stress may amplify the noises. The installation position of the fuel tank and the contact surfaces on the body\-in\-white should be checked here. To do so, release the fuel tank and refasten it, see WIS. Replacement of component parts such as fuel tank/delivery module does not provide a remedy\! If a similar noise is heard, but the tank volume is 3/4 or 1/4 and not 1/2 as described above, another circumstance is present

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021969-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021969-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Fuel system

## Vehicles listed

- 2023 to 2024 MERCEDES\-BENZ AMG C43
- 2024 MERCEDES\-BENZ AMG C63 S E

JSON: [/v1/bulletins/11021969](/v1/bulletins/11021969)

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