Vaccum modulator

[fc3]

Where is the vaccum modulator for my 400 Turbo located exactly? Does the vaccum line go to the front of the Q-jet(for the modulator)?

[73BB]

If I recall it is on the passenger side, toward the front of the pan on TH-400's, it's a small bronze cannister.

The vacuum source should come from a direct full-time source like right off of the intake manifold.

Hope this helps.

[rpounds]

On my '75, the vacuum source is on the intake manifold directly behind the carburetor, sandwiched in between the carb and the distributor. This is a threaded 'tree' that has two vacuum outlets, one of which goes to the tranny and the other to the vacuum accessories.

[Bullitt]

Mine is the same with the hose running to the vacuum port on the intake manifold off a hard steel line from the modulator. The hose is used only on the ends. The other port on the fitting feeds the vacuum tank.

--Bullitt