Re: Zr1 secondary pump
After all the above, if pump stops running by plugging hose near it & you don’t have a smoke machine just yet—pull & put your finger over the vacuum line going into driver’s side of the plenum (with key on and pump assumably running). Does the pump stop/intermittent?
Yes: [at a minimum] failed check valve under plenum. Temp solution: buy $7 check valve & hose to adapt at local auto parts & put inline at plenum hose connection until you can get under plenum.
No: see above comments—leak under plenum.
Ted
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