Ford Automobiles banner
1 - 1 of 1 Posts

Phoenix, AZ 85008
16,287 Posts
That is a vacuum can or reservoir.
The actual vacuum system is unknown. However, the picture looks like it is from a vehicle from the 70s and a full sized Ford or Mercury with a Windsor block engine.

Anyway, the possible vacuum systems are: (in no particular order)
Power door locks
Speed control
Concealed head lamps - however that reservoir may be larger
Or some other vacuum controlled circuit

The purpose is to maintain a vacuum signal during periods when engine vacuum is low. Like dropping the pedal on the right to the floor. This would cause engine vacuum to drop to near zero.

1 - 1 of 1 Posts