280z gas tank swap into early 240z

[zgeezer]

The swap is easy, but not a complete simple R&R.

 

The 280 tank out of any 280 without the false floor and shallow spare tire well will work.

 

The 280 tank is longer, it is deeper, and it lacks one of the tank vents on 240's. The 280 tank's fuel level sensor is interchangeable with the sensor and float of the 240. The 280 has an additional sensor, which I think is a pressure sensor attached to the fuel level float arm.

 

The 240 fuel tank straps are both too short to mount the 280 tank. You will need 280 straps. I think 280 straps mount in the body in the same fashion as the 240s, but I'm not certain.

 

The passenger's side fuel tank strap indentation on the 280 is located the same as the 240. However, the 280 strap indentation on the driver's side is located about 2 inches wider to the driver's side than the 240. A longer strap from the 240 mounts would secure the 280 tank, but will not fit into the 280's indentation.

 

The 280 tank is well baffled. The 280 tank fuel feed and return are both larger than the 240 tank. The 280 return line is the same size as the 240 main feed. The 280 fuel feed line is substantially larger.

 

I have a number of photos posted on my album under zgeezer that illustrate the differences. I'll try to mount them here.

 

http://album.hybridz.org/showphoto.php?photo=13889&size=big&cat=500

 

This shows the length, the lack of a vent, and the relocation of another vent.

 

 

It's a little dark, but the depth of the 280 tank is a little less than depth of that block of wood. I think 2 inches.

 

http://album.hybridz.org/showphoto.php?photo=13887&size=big&cat=500

 

I think the 280 tank is well baffled.

 

 

Here is the reason I'm attempting this installation.

 

[img.] http://album.hybridz.org/showphoto.php?photo=13882&size=big&cat=500 [/img.]

 

The fuel level senders are interchangeable between 280 and 240. The 280 has an additional sensor, which I believe to be a pressure sensor. I don't know if the ohm readings of the two sensors are the same.

 

 

This depression in the bottom of the 240 spare tire well is shot from underneath and it matches a similar raised ring on the 280 gas tank.

 

g