30-05-2021, 11:37 AM
Having read all the answers I still supect the fuel pump, and suggest changing it for a known good unit. I once found a pump with corrosion internally, so it was short-circuiting itself. In that case the fuel was not draining into the sump, but the diecast parts of the pump may have gone porous. In my experience if an item is faulty but still passes all the usual tests the only way to reach a proper conclusion is by substitution.