Quote:
Originally Posted by ozwallaby
Maybe the wrong foto Dougal....
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Photo is correct, you might need to scroll across to see the altitude compensator, depending on your screen size.
Adding boost pressure to that port is going to reduce fueling on boost.
All the different devices which can be added to the back of an A type pump work by pushing or pulling on one pin.
When that pin is pushed in, it reduces rack travel and reduces max fuel delivery.
When that pin is released, it allows full fuel delivery.
The real aneroid (which my engine has) is set off to the side of the governor housing and it's housing includes a rocker. This rocker is used to release the pin when boost pressure is added to the can.
As you can see the altitude compensator is directly inline with this pin, so adding pressure to the port on the back will push the pin into the housing, restricting rack travel and reducing fuel delivery.
If you want it to deliver full fuel on boost then you need to hook a boost line up to the other side of the can.
But such an endeavour is pointless as when set correctly, your altitude compensator won't be restricting fuelling unless at very high altitude.