IP: hose to manifold?? help

[haybayian]

On top of my injection  pump (1993 AAZ) there is a barbed fitting and I was told here a few months ago that I was looking at the  injection pump's hose to manifold. Could someone explain to me what air pressure from the manifold does in this system and where on the manifold to connect this hose.
Thanks.
Haybayian

[Vincent Waldon]

This hose tells the injection pump what the intake manifold pressure is so that it can adjust fueling accordingly... specifically: the pump increases fueling when the turbo adds boost.

You should be able to find a pressure outlet tube on the intake manifold... on most AAZs I've seen its right at the base of the flange that the rubber turbo hose connects to, on top of the intake manifold.  Follow the rubber intake hose from the turbo to the intake manifold and then look at the base of the bolted-on part of the flange... you should be able to find a short tube that the other end of the hose connects to.

Incidentally , the same cloth-covered tubing used between injectors will work for the connection between the intake manifold and the IP *and* that's the same hose you would connect to a boost gauge using a tee.

[haybayian]

This hose tells the injection pump what the intake manifold pressure is so that it can adjust fueling accordingly... specifically: the pump increases fueling when the turbo adds boost.

Thanks again Vince, this makes sense indeed and I can see a fitting right above the intake manif/elbow flange.
Haybayian