Talk Morgan Forums Morgan Sports Cars Morgan Plus Four, Supersport & Plus Six (CX & CXV Generation Vehicles) Fuel filler cap disengagement difficulty

I was in touch with Newton Equipment who manufacture the PlusFour CX fuel caps.

They simply suggest loosening (or tightening) the nut on the back of the filler cap a quarter-turn - if it tends to jam (or is too loose). The nut is visible in the attached photo.