You don't Pull a vac on anything...you are looking for a vac leak at a line or connection.
I already told you how to test the regulator and it has passed the test. It leaks gas out the port into the vac line , which the engine then sucks in raw, unmetered fuel which the engine management can not control.
A ruptured reg also can no longer control the fuel rail pressure to spec, so the a/f mixture is also off.

Common vac hose leaks on HFM engines are at the SOV valves for both the AIR system and the EGR system, along with the Purge valve..that is why you want codes...........................first check is the plastic line under the frint cover...they carck all the time on that engine.

And none of this means you do not have a bad Maf, it is just things to check first ...getting codes will help in your diagnosis.

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A Dalton