Chicagoland MG Club
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.)
Back to MGB Tech Tips
- Place the lightly greased seal against the hole in the gas tank.
- Insert sender unit into tank.
- Place lock ring over top of unit and turn to lock.