Originally Posted by Gary Sullivan
Seems I fixed the tail lights. The design isn't a particularly good one. Several pieces are compressed together and it doesn't make for a good ground to the metal casing for the lights. Even if they are clean and lubed. After what seems like a zillion tests, I attached a common ground wire to all the different lamp housings, to the side of the bulb the bulb and ran that to the body and that seems to have fixed the tail light issue and they are much brighter.
Now on to the fuel pump circuit.
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If FI pump wiring is running hot, it means pump is straining - running outside factory design specs! . . . most likely due to restriction at pump intake. REMEMBER!!: high pressure FI fuel pumps are NOT!! designed to suck fuel!! . . . they are designed to pressurize an unlimited and unrestricted fuel volume at their inlets.
That's why modern FI pumps are mostly mounted inside the fuel tank currently and, when a pump "fails", the entire assembly, including the strainer and fuel level sender, is replaced!
As I recall, you went through the whole tank thing a while back, but there's one thing you may have overlooked!
If you still have the original Bosch, or direct Bosch replacement, pump . . . it has a small sock-type strainer inside the pump intake pipe! Germans are anal about details . . .