Filler neck with blocker device for diesel fuel tank

A filler neck for a diesel fuel tank, the filler neck comprising:

• a filler neck housing;
• a pair of control levers mounted pivotably on control lever pivots in the filler neck housing and configured such that on insertion of a nozzle of a diameter greater than a minimum diesel nozzle diameter into the filler neck, the control levers pivot in an outward direction, and do not pivot in an outward direction on insertion of a nozzle of a diameter less than the minimum diesel nozzle diameter;
• a control spring attached respectively at both ends to the control levers and configured such that the pivoting in an outward direction by the control levers leads to a defined greater change in position for at least one control portion of the control spring;
• a blocker lever mounted on a blocker lever pivot in the filler neck housing and pivotable between a blocking position which prevents insertion of a nozzle beyond the blocking lever and an unblocking position in which insertion of a nozzle beyond the blocker lever is allowed;
• a blocker latch configured for movement between an immobilizing position and a non-immobilizing position, and which interacts with the blocker lever such that in the immobilizing position the blocker latch immobilizes the blocker lever in its blocking position, and in the non-immobilizing position does not immobilize the blocker lever in its blocking position whereby the blocker lever may pivot into the unblocking position;
• a blocker latch spring configured to load the blocker latch towards the immobilizing position,
• wherein the control spring is configured to permit movement of the blocker latch out of the immobilizing position into the non-immobilizing position by the defined greater change in position of at least the control portion of the control spring,
• wherein the blocker lever if not immobilized in the blocking position is configured to pivot into the unblocking position through the insertion of a nozzle.