Fuel tank sending unit

[CrayZ]

Is there a difference between the 240,260,280z fuel tank sending units?

[z240]

There are three varieties. 240's have a simple two wire connector, 260/280 up to 7/76 has a third wire as there is an "empty" sensor thing on the arm as well, then there is the late 280 sender that goes in the top of the tank , as the 8/76 and later cars have quite a different tank.

 

The 240 and early 280 sensors mount in the tank the same way, and other than the electrical connectors are interchangable for the fuel level function. Just have to "alter" the wiring to suit. The 240/early 280 tanks are slightly different volumes and shapes, so there may be small differences in float arm length or electrical resistance full/empty, but they are small.  We seen posts here or on czcc that suggest new senders don't have the same bends on the arms, (or any!) as the stockers, and if you don't make them the same, you level reading will be off.

 

Can't think of anything else. Hope this helps

Edited April 9, 2013 by z240

[CrayZ]

I have a 77 so is my best bet to stick with a 280 unit? Also does anyone know if the stock sending unit will work with autometer guages?

Edited April 9, 2013 by CrayZ

[CrayZ]

I just called the Z store and they are tellin me that the 280 sending units are not available anymore. He suggested I use a universal unit. Anyone run into this issue with aftermarket guages? Any "quick" fixes?

[duragg]

Can you find a used 77 sender?

I followed another Hybridz thread to calibrate my 73 sender to my Equus (GM?) gauge with a 350ish ohm resistor.

 

There is a website where you can calculate what is needed:  http://www.1728.org/resistrs.htm

Example, I think my Z is a 90ohm empty signal and I needed to add a 360ohm resistor to make the final signal at the gauge the 73ohm it wanted to see to read zero.

Going from memory, just an example.

Tj

[CrayZ]

The autometer guage I have I there now was working with the current sender. I'm hoping I can just find a replacement and call it square.

[CrayZ]

The autometer guage I have In there now was working with the current sender. I'm hoping I can just find a replacement and call it square.

[duragg]

There is a TON of 280z and ZX for sale and part-out in Phoenix.

Check Craigslist here.

Tj

[CrayZ]

thanks

[CrayZ]

http://www.zcarsource.com/content/p/9/pid/52788/catid/7625/Fuel_Tank_Sending_Unit_77_78_Core_Charge_refurbished

 

Just found this.. looks like the easiest fix

[RebekahsZ]

I had unreliable sender function for a year, until I cleaned up the connections between the chassis harness and the sender.  Works perfectly now.  I'm sure you already tried that....just sharing my experience if it helps.

[CrayZ]

I had unreliable sender function for a year, until I cleaned up the connections between the chassis harness and the sender.  Works perfectly now.  I'm sure you already tried that....just sharing my experience if it helps.

 

I rewound the wire when I first hooked up the guage but haven't tried cleaning the connections yet. The car will be down for a couple of months for major mods and repairs so ill give that a try before I send it off.