How to adjust the magnetic control in the event of loss of signal

 
SOLUTION 
Loosen the screws B and C to ensure that the magnetic control is surely at bottom on the divider. If it still does not show, try to also loosen the screw A to move the device 1655067 with the screw 3230019. Looking at the head of the screw, by turning it anti-clockwise, the 1655067 approaches the metering piston improving the sensitivity of the exchange. Not to spill the unit over an 1,5 mm from its aluminum body, may indicate two exchanges.
When finished, turn the screw A to block 1655067 ; then block the sensor on the package with the screws B and C. These screws should be tightened moderately, taking into account their size.