Quick question. According to the manual, in order to depressurize fuel system one needs to '...pull cable from terminal 85 of fuel pump relay'.

Is it the purple connector, with a black wire coming to it, in the picture below?

 

I believe it should be that one, yes. You can look at the diagram on the side of the other relay to check. Also, just pull that purple connector (where did the PO get all this purple stuff?) and then flip the ignition on to see if you hear the fuel pump.

 

The fuel pump relay on a V12 pre facelift is the one nearest the rear of the car, ie the black one with the red connector in the photo. The one with the purple relay and black connector is the main load relay, unless someone has changed their position from factory.

 

I see. Thanks Greg. I was using Electrical Guide manual and in there Fuel Pump relay was pictured as the second one in the row. That's why I thought it was the purple one.

Thanks for straighteing this out!

So, I assume to pull the terminal 85 wire I need to unplug the other connector (white/yellow) in the picture, correct?

 

The advice in the manual seems wacky to me. Pulling a single individual wire out of the relay socket is a bit of a PITA. More commonly the procedure calls for simply removing the relay from the socket.

That's what I would do.

(Well, actually, no it isn't. I'd wrap a towel around the fuel inlet fitting a crack the fitting open just slightly....letting the fuel dribble into the towel and thus depressurizing the system. Then toss the towel out into the yard to air out. But that method is messy, unsafe, and irresponsible. I really shouldn't have even mentioned it)

Cheers
DD

 

Can't really tell in the picture, it sort of looks like 85 on that relay is black in the picture. Again, just use the diagram on the side to find 85 and unplug the corresponding wire. The wires lock into the adapter with a tab, you have to stick a small screwdriver into the socket to bend the tab and allow the connector to come out, simply bend the tab back when replacing the wire.

 

I was thinking the same thing doug. Is the fuel relay only for the pump? I didn't mention it because I couldn't recall if it was necessary for the injectors to fire, which would be needed to depressurize the system obviously.

 

Well, it happened to be the purple connector (and the farther, purple relay) in the end:

I tried to disconnect the yellow/white connector first, which goes to the black relay, as Greg suggested. But this resulted in no cranking at all. So, then I connected the white/yellow and disconnected the purple. This time there was no fuel pump humming sound, but the engine still cranked.

So, using the method of elimination I confirmed that in my car ('85) the fuel pump relay is the second in the row (the purple one in the picture)