I haven't found many helpful posts about this so I'm asking myself...what in the HELL does the PCM B fuse go to? I've read things about fuel pump, fuel pump relay, ecu, ignition switch, etc. No one really seems to have hit the nail on the head yet. My dilemma: twice in the last week my truck has randomly died while driving. Culprit: Blown PCM B Fuse. Engine still getting fire...will run for a few secs when gas is poured down TB and started. Which tells me it's fuel-pump related. That's all I know. I know others are still trying to figure this out as well. PLEASE HELP!!!! And thanks PS, how bad would it be for me to just put a 10A circuit breaker in the fuse slot? I've done it before with the idle/gage fuse that was blowing randomly on another truck, with no problems.