The ALDA uses the pressure from the turbo to increase the fuel flow from the injection pump, so using a miti-vac to put pressure into the ALDA is correct, but limit the pressure to 15 PSI. If the ALDA leaks down quickly or won't hold pressure at all, you may be able to take it apart and replace the o-rings to fix that.

__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC