Fuel contamination issues

A brief pictorial history of the truck that pretends to be my service truck when it isn't stranding me outside of cell phone range. 2001 Duramax, major fuel leak codes and 2000 rpm derate under load, went to 3 shops that "fixed it" before I worked on it. They put in 8 new injectors, two fuel control modules, and reflashed it. None of which helped, at all.

This is the steel fuel line running along the frame rail, the rust scale inside the line allowed air into the line with the engine running but as you shut the engine down the scale would seal the pin hole and prevent an external leak.

The fuel tank pickup screen in the front tank was almost entirely plugged with dirt and rust scale, it was enough of a restriction that under load it would suck the fuel primer button down and effectively turn off its own fuel.

More fuel system issues, that is a metal shard... The fuel pressure regulator stuck open, truck would die at stop lights and foot to the floor it would barely stay running.  No fault codes.

Electronic issues for a change, intermittent electrical death... Instrument cluster failure and transmission controller faults (driving down the road the instrument cluster would die and transmission would default to neutral).

Found a major voltage drop on the Ignition 0 circuit due to burned contacts in the ignition switch.