Fuel tank ?????

[flyer4100]

Just removed the fuel tank from my '74 260Z and suprised by what I see. I was always led to believe reading through this and other "Z" forums that the 260Z had an electric fuel pump at the rear. In addition having read the FSM for the 260Z it quite clearly shows a "Fuel Liquid separator" and additional plumbing of 2 ventilation hoses, none of which are fitted to my car.

Anyone got any ideas about this tank ?? is it off a 240Z ??

[260DET]

What month/year is it? There is a period of crossover time during which 240 bodies were fitted with 260 engines and called 260's.

[flyer4100]

Well the compliance plate shows 5/74 and the VIN number is RS30-000874

[Bambikiller240]

Looks like a normal fuel tank for either a 240, or early 260Z. Just to be sure, you do realize that the electric fuel pump would be external to the tank, and not located interally. Right?

Attached is is a picture of the fuel pump we (USA) received on 73 to 74 Z cars. I expect it would be the same one fitted to Aussie Z's.

[Mr Camouflage]

The electric Fuel pumps were exteranl to the tank. It's very possible that a PO could have removed it. They humg off a bracket that was bolted to the chassis cross member under the boot floor panel.

[flyer4100]

thanks for the pics...but sadly no evidence that they it was ever there. I also cannot find any find any spare wires for the elctrival supply. The wiring loom to the sender unit just has 2 wires, no spares or remains of other wiring..........

[Murph]

I have a 4/74 260Z and I've been through the same thing. What I found out was that the early 260's didn't have the electric pump, although they do have the wiring for it.

As for the "Fuel Liquid separator"/expansion tank and additional pumbing....the aussie zeds didn't get it. So, your setup there is quite normal.

[flyer4100]

So where would the wiring for the pump be routed - the fuel sender wiring comes from the rear of the boot area r/h side

[Murph]

Yep, that's where it comes out. The green wire that connects to nothing is the pump +ve. Just ground the pumps -ve to the chassis.

Now, from what I've found with my car, there's a pretty big voltage drop between the battery and this wire (~2V with no load). Add that this wire is unfused, old, and really wont be able to push a decent current. So I'd strongly recommend if you're installing a decent electric pump, to run a dedicated, relayed and fused feed straight from the battery.

Also, power to that wire comes on with the ignition. You'd be better off having it attached to a oil pressure switch. That way in the event you had a crash, the pump will stop when the engine does, minimising the risk of your pump pushing 500HP worth of fuel onto the ground.

[flyer4100]

Bingo.........found the wires a green and a black. Seems the PO must have opened up the insulation about 3 inches back and put some more tape back on .....

The car is going to have a complete wiring overhaul anyway but at least I know it was there to start with

Cheers everyone for their help on this

[EScanlon]

The wiring being a few inches away from the sender is normal. That's how Datsun would "park" the wires they weren't going to use.

Check the front and you'll find that the Fog Lamp wiring is also there but more than likely taped off also.

Your tank is also missing the two vent tubes that lead to the fuel vapor expansion tank. Those two vents would be located, one above the sender and one to the far back and far right of the tank in the picture.

Enrique Scanlon

[Rogersz]

My 260Z has exactly the same tank and no pump , RS30-000646

4/74 . i cant work out why the outlet for the breather tube points

away from the filler neck?