It sounds like I have an air leak (like with a nail in a tire) It is coming from the area of the fuel filter, brake booster.
I'm getting 24-25 boost stock and it is running fine. I hear it when It is running and sitting still, not when turned off, I can not hear it in the cab with the truck shut up and it does not get louder running like a boost leak.
Maybe just the Hydro booster or fuel lift pump or something???
Anyone hear something on there truck like this?


Jon

 

I'm having as similar issue with mine. I took a quick listen with a home made stethascope (5/8" piece of tubing to my ear) to listen. I was thinking that it could have been my plastic end cap on my IC. But the soap water didn't show anything.

I was also currious if this has happend to anyone else.

Thanks!