I am in this same boat.

I have confirmed that my pump works. I removed the vac line from the pump and put the mityvac to it and could not get any vac. Surprise, surprise.

Should I start at the door closest to the pump (PS rear)?

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2009 VW TDI Jetta Sportwagon 172k miles (rear-ended harder than Elton John on 8/4/13. Total loss)

1991 Volvo 240 142k miles (T-boned by a stop sign runner. Total loss)