D250 3/4 Ton Pickup 2WD V8-318 5.2L VIN R 4-bbl (1982)
Air Injection Relief Valve: Description and Operation
Fig.2 Relief Valve
PURPOSE
The relief valve, Fig. 2, controls air injection system pressure.
OPERATION
At high engine speeds excessive pump output is diverted to the atmosphere through silencer material in the valve.
