Fuel Pump Wiring Harness ?s

[71Nissan240Z]

So my mechanical fuel pump was pouring fuel into my oil. So out with that. Been wanting to upgrade to electrical for a while.

Now to the nitty gritty. I know there is a T shaped female plug by the radio that you must short together to get power at the plugs by the gas tank. The problem is I'm not getting any voltage at that T shaped plug. So I'm wondering if I'm doing something wrong or there is a fuse somewhere I need to check. I wish I had a service manual for the wiring diagram. I spent a few hrs going around pretty much with no success.

My car is a 71. So the 73 service manuals are the only ones I have access to.

[SteveJ]

In two wiring diagrams I looked at (the one in the 1971 supplement PDF and the 1972 BE section), the wire to the fuel pump is a green wire. It should go to a 20 A inline fuse. The upstream side of the fuse comes off of the ignition switch when it is in the ON position.

 

I don't know why you don't think you have access to the PDFs I am looking at. They are available at XenonS30 (link below).

[71Nissan240Z]

Thanks for the help.

[SteveJ]

I should add that you might consider adding an inertia switch to the circuit for safety. You can find them on ebay.

[71Nissan240Z]

I'm pulling an inertia switch off a Ford tempo in the junkyard. It's about 1 dollar. Inside the trunk.

I saw the wire diagram. But I'm still curious why nissan made the fuel pump circuit incomplete. I'm not sure what to do yet with that T shaped plug by the radio.

[SteveJ]

I'll let people like Alan & Carl speak up about why the fuel pump wiring is present without a fuel pump.

 

What are the colors on the connector by the radio?

[71Nissan240Z]

The T shaped plug has a green wire going to it and a black and white wire.

[SteveJ]

The black/white wire should have 12 VDC when the ignition is in the RUN/ON position. If it is not connected to the green wire in any way, you won't get power to the fuel pump. Can you post a picture?

[71Nissan240Z]

Ok I'll post a pic

[71Nissan240Z]

Here is a pick of the said plug

[SteveJ]

Now, have you been able to find the inline fuse? It may be that you need a female connector with the inline fuse to connect these two wires. I haven't ever traced out the actual wires myself, though. It doesn't show that connector in the 71 supplement, either.

 

You can probably get the correct female connector from Vintage Connections.

[71Nissan240Z]

I didn't find that in line fuse. But I do know that there is no power at that plug by the radio. I know I could probably tear into the dash and find the issue but I think I'd rather make my own harness. After going through the trouble with using the oem fog light harness and finding out there's almost a 2v drop from the switch to the plug, I'd hate to waste time again.