Update: I was mostly wrong. Figured the in tank pumps weren't running because the high pressure pump wasn't getting any gas. The problem was two fold. Mostly it was a clogged DFR but the high pressure fuel pump was only just barely working too. (DFR - Dual Function Reservoir - It's a non electrical, automatic switching valve between the 2 fuel tanks. These have a well earned bad reputation.) The problem wasn't clogging so much as it was a swollen tiny o-ring that vents the diaphragm inside. The o-ring swells from the ethanol they put in gas these days. You remove it, bore the center out with a 1/16th inch drill bit and put it back. Works like a charm or at least mine works now. (good idea to clean DFR out completely too) The new fuel pump made quite a difference as well. My truck has a lot more pep now. Not getting starved for gas! note: a bad DFR does not automatically mean you need a fuel pump. Mine was just really old. Always test a pump before replacing. Assuming costs money and may not fix the problem. Cheers