I have been scouring forums and the Internet and cannot seem to find much on my issue.
I bought this truck a few months ago and it runs great on the front tank. The fuel pump on the rear tank was bad, so I replaced it. It ran fine for a bit, but then went to randomly, spitting and sputtering and laboring to move forward. I had a bad seal on the vapor valve, so I replaced that, hoping it was a EVAP issue, no dice, same problems. I have not changed the vapor valve because, at this point, I am tired of dropping that tank and I don't want to do it again unless I absolutely have to.
I know this year truck had a recall on the cross over fuel switch, I haven't checked to see if that was done, but I can tell you that no fuel goes from the front tank to the back tank as I have run that back tank empty multiple times (because it has been dropped multiple times) and it is always empty; I don't know if it pumps rear to front though, but I have not had any of the symptoms of that problem.
I know a bad vapor valve, vacuum leaks, bad check valve in the other fuel pump and possibly the cross over fuel switch/valve can cause these issues but I really don't want to keep dropping tanks and replacing stuff if I don't have to.
I will be testing the inertia switch, relays and fuel tank switch, hopefully it is one of those.
Any help/tips on where to start would be appreciated.
Edited by Dmalan2015, 04 October 2016 - 06:58 PM.