In prep of total vac and air hose replacement I noticed nothing matches up on the canister. Going from left to right on the diagram (1,2,3,4) my #1 (purge signal) goes to the fuel tank, not the EGR. #2 (PCV purge ) goes to purge solenoid. # 3 and 4 are “T” connected and run to a multi vacuum connector on the cylinder head. WTF? I do have excessive fumes in cab. Just a PO fuck up or does this make sense for a reason?