While you are there, do check the tubing from the filler cap to the tank (33 on the diagram, although your car might have a little different configuration). Over years the rubber can get hard as rock, crack up and start leaking. Mine did (same car and year as yours), took me a while to find out where that strange smell came from as it was intermittent - only when the tank was nearly full and mostly in left hand corners. Well known weak point in Morgans. Look for cracks, especially round the jubilee clips.
