yo,
No **** needed; this is by Ford:
Test; "... 1.Check and, if necessary, adjust the belt tension. Press at the mid-point of the belt's longest straight run. You should be able to depress the belt about 1/2 in. (13mm) at most.
2.Run the engine to normal operating temperature and let it idle.
3.Disconnect the air supply hose from the bypass control valve. If the pump is operating properly, airflow should be felt at the pump outlet. The flow should increase as you increase the engine speed. The pump is not serviceable and should be replaced if it is not functioning properly..."
The air filter does not require any type of replaceable element.
&
Rebuild This is how to fix a seized air pump for nearly nothing:
1) break the three 10mm pulley bolts
2) remove the belt
3) remove the pulley bolts
4) loosen the two hose clamps (5/16", 8mm, flathead) and push the hoses back
5) remove the 9/16" (14mm) upper bolt
6) remove the 1/2" lower rear bolt
7) pry the pump case forward to open the clamp sleeve around the upper bolt hole, and remove the pump
8 ) reinstall the pulley bolts finger-tight
9) spray penetrating oil liberally into the hose ******* & the two 3/16" vent holes in the back of the case, rolling the pump to distribute the oil thoroughly; allow the oil to soak in for several minutes
IF ANY METAL CHUNKS OR FILINGS FALL OUT, replace the smog pump
10) use a propane torch to warm the case just so it's hot to the touch; don't melt any plastic or set fire to the oil
11) holding the assembly by the pulley, strike the large boss running across the bottom of the pump back & forth to break the impeller loose of the corrosion inside; apply more oil as necessary
12) continue rotating the pump at least a full turn with the hammer; when it's loose enough, spin it by hand until it turns smoothly
13) dump as much oil as possible out of the hose *******
14) if you plan to ford deep water, plug the vent holes with silicone rubber or RightStuff
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
GL!