Fuel pump going bad?
Newbie
Joined: May 2024
Posts: 12
Likes: 8
GLS450 E400 E350
No resolution on this issue. I took our car in to the dealer for a different issue over Christmas and they went ahead and replaced the gas tank (again?) without consulting me. They also replaced the engine mounted crankcase ventilator because one of the techs was sure that was causing the noise.
Recap: Noise began after fuel pump recall work was performed. The noise used to last longer which allowed me to record it. Significant work was performed by dealer outlined above. Currently the noise only happens for short periods of time (2-4 seconds) when coming to a stop. The noise does not happen when the fuel level falls below 93% in the tank.
It seems to be a fuel pressure differential causing a pump part to make the noise. During flow while driving there isn't an issue. Once fully stopped the thumping happens. I'm not sure what happens mechanically at that particular point within the fuel system.
Perhaps I am describing the ideal conditions for cavitation at the pump?
https://www.perplexity.ai/search/can...R0GNwHtvqFqwvA
https://forums.nasioc.com/forums/sho....php?t=2352695
Recap: Noise began after fuel pump recall work was performed. The noise used to last longer which allowed me to record it. Significant work was performed by dealer outlined above. Currently the noise only happens for short periods of time (2-4 seconds) when coming to a stop. The noise does not happen when the fuel level falls below 93% in the tank.
It seems to be a fuel pressure differential causing a pump part to make the noise. During flow while driving there isn't an issue. Once fully stopped the thumping happens. I'm not sure what happens mechanically at that particular point within the fuel system.
Perhaps I am describing the ideal conditions for cavitation at the pump?
https://www.perplexity.ai/search/can...R0GNwHtvqFqwvA
https://forums.nasioc.com/forums/sho....php?t=2352695
Last edited by EClassic; Feb 5, 2025 at 03:16 PM.
