R40 damper problem

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cm3luc

Hi,

I have a Riello R40, i replaced the control box as it was playing up (stop startin, not firing up) .

However,now with the new CB, when she is on prepurge, the damper is not opening up the air flap, tho when there is ignition it opens up no problems- is there any reason for this? i tried another pump but it was exactly the same

I was wandering, can i just take the flap off?

Also, what is the difference between a R40 pump and a RDB pump, is it just the side mounting bolts for the copper oil pipes? if i switched these bolts over is there any issues?
 
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