There is no vacuum canister on this vehicle.
The vacuum modulator on a 300zx should be located on the rear of the engine. It is on the passenger side at the top, close to the firewall.
Inside the Driver's Side Fender
A central vacuum system eliminates the need to use a cumbersome upright, canister or bagless vacuum. Central vacuums are designed to suck dirt and debris through a hose located in the walls and collect it in an out of the way canister.
it is behind the engine and infront of the clown
"The benefits of purchasing a Miele canister vacuum versus a Miele upright is that the canister vacuum, for one, is quieter than an upright. Also, the canister vacuum comes with attachments that allow you to get into tighter place than the upright. If you have stairs, it's easier to maneuver the canister vacuum, and it's also smaller than the upright. It's also easier to clean car interiors with a canister versus and upright. And the tools and attachments that come with a canister are stored inside the canister. However, with an upright vacuum you don't have to constantly move it around. Uprights also have more suction power than a canister vacuum."
You can find complete diagrams at http://www.CarGurus.com
You can find complete diagrams at http://www.CarGurus.com
When the vehicle is under acceleration it doesn't supply vacuum. The vacuum canister or reservoir holds a vacuum supply to operate vacuum operated accessories until the engine regains vacuum.
I'm pretty sure it is hidden under the battery tray.
An upright vacuum usually cleans carpets better, but a canister vacuum is better with liquids or heavy debris.
Bag vacuum cleaners require a bag and this is what catches the dirt that you vacuum up, when the bag gets full, you simply throw it away and replace it. Canister vacuums suck up the dirt into the canister attached to the vacuum. You then detach the canister and dump the dirt out of the canister.