Help please, jaguar xjs 2+2 1994 4.0 engine. As part of the fuel pump relay connector in the right rear fender well. The relay is five blade. Extending from the relay connector base is a 1 wire module with 4 diodes (encased and sealed in transparent plastic) the wire in the diode goes between pin 85 which comes from the ecu high power side and pin 86 wich comes from the ecu low power side. I have replaced the fuel pump and when I jumper wire 12v to the fuel pump power wire (the blue red wire), the pump turns on and the relay is new. I removed the module and pump does not turn on. There is 12v at pin 85 coming from the ec high power side. Searching the net I find only that this module might be a voltage control module. there is part no number and nothing in jaguar electic specs. This module connection is not an add on and is integral to the relay connector base. So it seems that without this module the fuel pump will not operate. My knowlege on this limited so all suggestions are greatly appreciated.
John