The Bugpack pump plumbs quite different than the CB pump.
Had to call a buddy of mine to verify this.
Didn't have a BP pump in front of me to check.
Bugpack pump has two ports on each side.
This is an Autocaft pump but it should be similar.
The red body deal on the end is to drive a fuel injection pump.
Yours will have a flat cap.

When the pump is installed, the port closest to the engine on the 1-2 side is plugged.
Should be an SAE threaded O-ring plug, possibly 3/4-16.
Port directly across from that on the 3-4 side returns case scavenged oil to the tank.
There again this is the port closest to the engine on the drivers side.
The port on the 1-2 side furthest away from the case is plumbed to the bottom of the tank.
This pulls oil from the tank, pressurizes it and then through the opposite port, again on the 3-4 side furthest from the case, and is plumbed into the full flow pressure port that you have tapped in the case.
I like the oil filter and cooler on the scavenge discharge line that returns to the tank.
Filter first then cooler.
There is no pressure on this line and the filter keeps the cooler and tank from being contaminated if an engine lets go.
Some add a second filter to the oil pressure to engine feed line that goes from the 3-4 side outermost fitting then through a filter before it plumbs to the port in the engine.
This prevents any debris from getting pumped into the engine should the tank get contaminated from an external source.
_________________
Gary
Turbo VW Sand Racer
Polaris Ranger
"If you don't run into the Devil every once in awhile, you must be going in the same direction!"
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