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Leaking Tank Sender Unit

(Applicable to post-1965 MGB.)

Cars that use seal (#293-410) and lock ring (#360-665) to retain the tank sender unit in the gas tank can suffer from leaks in this area. This is particularly common when a new tank is fitted and the seal and lock ring are replaced as a matter of course. The most common reason for a leak here, is an incorrect sequence of assembly. (This often occurs when the parts books show the components in the wrong order.) The correct parts fitting sequence is as follows:

(The illustration shows the parts correctly positioned.)

  1. Place the lightly greased seal against the hole in the gas tank.
  2. Insert sender unit into tank.
  3. Place lock ring over top of unit and turn to lock.
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