Pontiac FIREBIRD 1972 Service Manual page 760

EMISSION CONTROL SYSTEMS 6D- 17
Fig.
6D-28
Checking for Leaks with a Soapy Water
Solution
A.I.R. HOSES AND TUBES
INSPECTION
1. Inspect all hoses for deterioration or holes.
2. Inspect all tubes for cracks or holes.
3. Check all hose and tube connections.
4. Check all tube and hose routing. Interference may
cause wear.
5. If leak is suspected on the pressure side of the system
or any tubes and/or hoses have been disconnected on
the Dressure side. the connections should be checked
for leaks with soapy water solution.
Y
A I R S H O U L D F L O W
I N T H I S D I R E C T I O N
O N L Y
Fig.
6D-29
Air Flow Through Check Valve
6. With the pump running, bubbles will form if a leak
exists (Fig. 6D-28).
REMOVE
To replace any hose and/or tube, note routing then
remove hose(s) and/or tube(s) as required.
INSTALL
1. Install new hose(s) and/or tube(s), routing them as
when removed.
2. Tighten all connections.
CHECK VALVE
INSPECTION
1. The check valve should be inspected whenever the
hose is disconnected from the check valve or whe-
never check valve failure is suspected. (A pump that
had become inoperative and had shown indications of
having exhaust gases in the pump would indicate
check valve failure.)
2. Blow through the check valve (toward the cylinder
head) then attempt to suck back through check valve.
Flow should only be in one direction (toward the air
manifold) (Fig. 6D-29).
REMOVE
Disconnect pump outlet hose at check valve. Remove
check valve from pipe assembly, being careful not to bend
or twist the assembly (Fig. 6D-30).
Fig. 6D-30 Removing Check Valve