It must be connected to a full-time vacuum source such as the intake manifold.
bigger port, lower vac, smaller port, highr vac..........
Take a vacuum hose off at the intake manifold and put a vacuum gauge on the port, then read the vacuum with the engine running.
It hooks to a vacuum port on the intake manifold behind the carb.
if you cant find a plugged vacuum port on manifold buy a tee fitting and tap into it
To hook up a vacuum, pressure, and tester on a 2002 Saturn L300, first locate the intake manifold vacuum source; typically, you can use a vacuum port on the manifold. Connect the vacuum gauge to this port, ensuring a secure fit. For pressure testing, disconnect the vacuum line and connect the pressure tester to the same port. If you're testing for leaks or other diagnostics, follow the manufacturer's instructions for the specific tester you are using.
You did not say what you were working on and that would help. Now I do know that it has to go to a direct vacuum source like the base of a carburetor or the intake manifold vacuum port.
On a 1997 Chevy 1500 Gladiator van, the vacuum port is typically located on the intake manifold. It can be found near the throttle body or on the manifold itself, often near the base. You may need to consult the vehicle's service manual for the exact location, as it can vary based on the engine type and configuration. If you're having trouble locating it, checking for a vacuum hose attached to the manifold may help.
It needs to be attached to a full time vacuum source such as a port on the intake manifold.
To connect a vacuum pump to an AC system, first ensure the system is properly evacuated of refrigerant and all service valves are closed. Attach a set of manifold gauges to the service ports on the AC unit, then connect the vacuum pump to the center port of the manifold using a suitable vacuum hose. Open the valves on the manifold to allow the vacuum pump to draw air and moisture from the system. Once the vacuum reaches the desired level (usually around 25-30 inches of mercury), close the manifold valves and turn off the vacuum pump.
On a 1994 Chevy Pickup 1500, the manifold absolute pressure (MAP) sensor is typically located on the intake manifold, near the throttle body. The vacuum line from the MAP sensor connects to a vacuum port on the intake manifold, which allows it to measure the manifold pressure accurately. Ensure the vacuum line is free of cracks or leaks for proper sensor functionality.
On the 2001 4.2 V6 engine, the brake assist vacuum line typically attaches to a vacuum port located on the intake manifold. This port is usually found on the driver's side, near the rear of the manifold. Ensure that the connection is secure and free of any leaks to maintain proper brake functionality. Always refer to the specific vehicle service manual for precise location and details.