I'm sure there is lots written about this, etc. But I am still ignorant about the location of my delinqent lift pump, and am trying to get ready to go on a 5000 trip and I want to install my new lift pump that I put on the shelf. Is it on the top of the fuel tank or underneath the hood by the fuel filter canister??? Can anyone help with this ignoramus question??? I want to change it out before I leave. . . I have the new appropriate one I bought from Cummins about a month ago.