fan ?

[too tall]

Just bought a 78 fj40 . In the engine compartment squeezed in tight to the cowl and fed from the drivers side vent there is a what looks to be some sort of fan. (smog device) . Just wondering if anyone knows what it is.Also there is a sqeal (vacumn leak) coming from near the head toward the rear of the truck. Replaced all vacumn hoses checked for loose fittings etc. Can't find it .Going insane!
P.S. The truck is currently running on propane and i know nothing about it at all. The truck runs good though.

 

[Degnol]

Carb cooling fan.
Is the squeal coming from your brake booster? Undo the vacuum line and plug the line, see if squeal goes away.
GL
Ed

 

[PabloCruise]

Don't know about propane, but my '78 had much better hot starts after I returned my carb cooling fan to comission.
I pulled my fan apart, found 1 piece of pea gravel in the squirrel cage. Then found the fan fuse (5A?) behind the fresh air intake under pass. side of dash. Replaced it and SHAZAM! It works! Kicks on automatically when sensor is warm, runs for a few minutes, then shuts off. Keeps fuel in carb from vaprizing.
Worth getting working for gas engines at least.

 

[Jetboy]

I have a 79 that I was thinking about taking the fan from and putting it on my 75. The idea was to have some type of check valve? and a push button switch on the steering wheel so I could use it as an electric supercharger. It seems like it pushes enough volume so that on areas like hill climbs where I need a little more hp I could give it a little air. I realize that It may not even get me back to 0 pressure, but i think it would help. Has anyone tried this? I'd like to know if it works. I'm in the process of converting back to a aissan 2bbl so I have to get it working correctly before I try any boost.

 

[Quazii]

If you find the brake booster is the vaccum leak it is running #5 and #6 lean and can burn up the valves! I did this on a 350. burnt the valves on #8 (where the booster pulled its' vacuum).