Ford Mustang 1989-1993 Repair Guide

Purge Control Valve


See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: Note which hose is connected to each side before removing the purge control valve

The purge control valve is in-line with the carbon canister and controls the flow of fuel vapors out of the canister.

When the engine is stopped, vapors from the fuel tank flow into the canister. On controlled systems, the vacuum signal is strong enough during normal cruise to actuate the purge control valve and vapors are drawn from the canister to the engine vacuum connection. At the same time, vapors from the fuel tank are routed directly into the engine. On some systems where purging does not affect idle quality, the purge control valve is connected to engine manifold vacuum and opens any time there is enough manifold vacuum.


  1. Disconnect the vapor hoses from the purge control valve.
  3. Remove the purge control valve from the vehicle.
  5. Installation is the reverse of the removal procedure.