OK guys, i need your help/advice. I know its not Old Skool, if it was id likely have it sorted by now! but..
My sister has a Mk3 Mondeo 1.8 Duratec, one day last week it wouldnt start, cranking over fine but no sign of life whatsoever. Later the same day it started and ran fine, without touching anything at all.
Then the other day the problem came back, i had a look at it and worked out it wasnt getting any fuel to the engine. Lifted the back seat to access the fuel pump and couldnt hear it pumping at all, unplugged the electrical connector to test for power with a multimeter and it showed over 12v. Fuel pump must be buggered i thought, ordered a new one, just fitted it but it still doesnt pump.
I put power straight to the pump from a seperate battery to check it wasnt a dud pump and it pumps fine, still getting over 12v at the cars wiring to the pump but when i connect it, nothing. Thought it must be a problem within the plug itself so carefully took each pin out of the plug and connected them to the pump to eliminate any loose connections, but still no life in the pump. The engine still turns over fine but doesnt even sound like catching.
With the electrical plug dismantled i could test the voltage while it was connected to the pump, and it showed nothing at all. So, what ive figured out is, with the ignition on, unplugged there is 12v, as soon as you plug it in that drops to zero?!
what could cause this? some sort of ECU / Fuel Module problem? My electrical knowledge is fairly limited so it could be something dead simple. next step i think is go through the fuses for ecu / control modules but i cant be arsed now, im freezing cold and soaking wet and had enough of this plastic piece of poo.
So does anyone have any suggestions? is there a common fault with these? I know theres some clever people on here, thanks in advance.