fuel pump issue

[Prestigiator]

Hello,

My car is nearing the end of its lengthy restoration and I've had a strange thing when re-starting the engine after 6 1/2 years: no fuel pressure.
Fuel pump was running, there was petrol in the tank, but nothing arrived, no pressure in the engine bay.
I inverted the wires at the pump, thinkig it may help to prime it and bingo: there was fuel in the engine bay.
But after reverting to the corect electrical feed (plus from vh on the plus shown on the pump) still no pressure.
When I got the car, pump was normally plugged, with "+ wire" connected to "+" port of the pump.

It now runs, still with the pump plugged with the "+" wire on its "- " terminal.
Could anyone explain that?

[stickandrudderman]

Seems you've disassembled the pump and upon re-assembly mounted the magnet cylinder 180° out. Very easy mistake to make.

[BaronYoungman]

If looking at top of can the @ type symbol should be farthest away from the red terminal. See picture

[ja17]

Also check the main battery cables. If you reverse those, everything except the fuel gauge and fuel pump will work correctly.

[BaronYoungman]

Wow! Joe, that is why you are the guru of W113 I would have never thought of that. That only comes from years of knowledge. You are such a asset to this group. Merry Christmas to all.