This is for NEW owners.

The ALDA Line carries air PRESSURE from the intake manifold.

Air PRESSURE to ALDA = commanding the injection pump to add more fuel per cycle.

Here are some threads you may want to study.

Diesel Injection:
http://www.peachparts.com/shopforum/showthread.php?t=142405

Exhaust:
http://www.peachparts.com/shopforum/showthread.php?t=144233

Fuel Delivery:
http://www.peachparts.com/shopforum/showthread.php?t=142399

Engine Mechanical:
http://www.peachparts.com/shopforum/showthread.php?t=142400