Transporter Fuel pump

[Shortbread69]

I have a similar problem when starting the engine for the first time in a while. Battery ok, starter ok but…

my lift pump is only running when testing with OBDeleven but not otherwise (driver door opening, key turning, etc.)

Both fuses in the fuse box B ok but changed.

faulty relay?

 

[mmi]

my lift pump is only running when testing with OBDeleven but not otherwise (driver door opening, key turning, etc.)

Both fuses in the fuse box B ok but changed.

faulty relay?

I think it works OK. Actually the lift pump won't activate by door opening or even turning ignition on. It seems to activate approx. 0.2...0.3 seconds before cranking starts.
Below a VCDS data capture made at cold start (+11 °C)

EDIT: "IGNITION ON" at 8.05 seconds. Key turned further to position "START" at 9.20 seconds.

 

[Shortbread69]

Thanks for that. So many different versions of how and when this pumps activate!