Guys I still have the issue with my S80 before she will run a little bit but now barely starts and stay running, revs very high and low and then stalls, does anyone knows about any common fuel pump problems and how to replace it, it also farts like lack of fuel any common known problems,has 85k miles need help,
Thanks

 

Check fuel pressure at the fuel rail. There is a valve on the end of the fuel rail.