1974 260z service manual

[Dolfinz]

Where in the service manual is the removal instructions for the fuel gauge/tank sender?

[SteveJ]

I'm not sure where it might be, but it's not too difficult. You will need to get the car high enough to get under the back. If that means jackstands, I suggest you drain the tank as much as possible first. Otherwise, you'll have fuel spilling out.

I advise you to get a replacement lock ring and o-ring before you attempt to do this. If the lock ring gets warped, it won't seal.

The lock ring has 4 tabs on it. I have arrows by where you need to turn it to remove the ring.

 

1. Remove the wires from the sending unit
2. Some people will place a screwdriver against one of the tabs and strike the end of the screwdriver to turn the ring. If you are worried about sparks, you may want to use a brass drift instead. I fabricated my own tool out of angle iron to turn the ring. You could also carve notches for the tabs in a piece of 2 inch PVC to turn it, though the height of the tool has to be small to fit unless you're dropping the tank.
3. Pull the ring off.
4. Remove the sending unit and o-ring.

Re-installation

1. Check the ring for flatness. If it is not flat, replace it.
2. Put the new o-ring on the sending unit
3. Thread the float though the opening in the tank and line up the sending unit with the locating tab on the tank.
4. Holding the sending unit so that it stays aligned with the locating tab, put the locking ring on, and turn the ring using the tabs until it locks into place.