Fuel Tank Wiring

[Amazombi]

Hi everyone,
I have a problem with connecting the wiring to the Fueltank. There are three cables. Blue, yellow and black. For those blue and yellow one I`m sure they are at the right place but the black one I dont know...
Any thing what I missed?
Thanks a lot for any help.

 

[Mr.F]

Yellow and black are for the sender - yellow runs to gauge; black to ground (earth). The blue (I think) is power to the optional electric fuel pump fitted in hot climate cars.
Test the wires for continuity - black to earth should show continuity; yellow to yellow at back of fuel gauge should show continuity. Test the blue for +12V with battery connected and ignition on - on a car never equipped with an electric pump you should find that the wire is dead, however. I suspect you just need to tape the blue back into the loom...

 

[Amazombi]

Thank you very much, I`ll try that.
Another question, I`ll run triple Weber with a elecktik fuel pump. Do you think I can use the blue one for the (not original) pump? In fact its an "Red Facet".

 

[Mr.F]

I would run fresh wiring via an ignition controlled relay for your Facet pump - ideally through an oil pressure switch so that it would cut out if the engine stopped (or oil pressure dropped to zero!). I don't think the original fuel pump wiring was connected in the car, so the circuit would be dead - test it just in case!

 

[Amazombi]

Thank you. I will do it as you said.

 

[Mr Ex]

I don't think the original fuel pump wiring was connected in the car, so the circuit would be dead - test it just in case!

My late model 260 pump wire was live when the ignition was switched on.

 

[rhanagar]

I had to run a separate ignition live for my fuel pump in a previous Z31 before now. I even fitted a kill switch in case of accident and added overnight security.