Hi all!

This question pertains to my 85 380SE. I have a very noisy fuel pump combined with a cold start problem. I'm pretty sure the cold start problem is due to the fuel pump check valve, but I heard a new noise the other day that makes me think that the check valve might be the cause of the noise and not the pump. When I shut the car off the other day, there was a familar pitch buzzing after the key was out. The buzzing got quieter and then faded out.

Has anyone else had any experience with a check valve making noise while the pump is running?