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Looks like the charcoal cannister for the evap system. One line to the fuel tank vent, the other line to the air cleaner. I recently saw a diagram of it here but I'd be all day looking for it.
Do you have a fitting on the outside of the aircleaner that is either unused or has a length of hose on it that will fit the fitting on the cannister?
That hard line on the frame goes back to the fuel tank or tanks. They had other lines and various components to purge the charcoal canister, which is what the box is called.
That hard line on the frame goes back to the fuel tank or tanks. They had other lines and various components to purge the charcoal canister, which is what the box is called.
There should be a vacuum line routing sticker on the radiator support.
The vacuum line dose not go to the air filter as 85e130 said.
That vacuum line has a tee that goes to the carb float bowl vent and then depending on the year (non-feed back) to a purge valve and then to the PCV
OR
(feed back) to a relay on the valve cover and then to the manifold IIRC.
Dave ----
It is clearly a vacuum hose coming through the firewall, passenger side, more or less at the top of the carpet under the glove box. It has a relatively complex “T” (reducer?) and both ends are capped…
id guess maybe 1 end went to the vacuum gauge under the dash and the other AC? Just seems like an odd spot to come through.
It is clearly a vacuum hose coming through the firewall, passenger side, more or less at the top of the carpet under the glove box. It has a relatively complex “T” (reducer?) and both ends are capped…
id guess maybe 1 end went to the vacuum gauge under the dash and the other AC? Just seems like an odd spot to come through.
Probably not stock. I believe the stock vacuum lines were smaller plastic colored lines that fed the HVAC, not rubber hose.
The one going to that black tee is your HVAC vacuum supply. One of the other lines on the manifold is supposed to go to the vacuum tree on the engine. The other one goes to your transmission if you have a 3 speed automatic. I would imagine that one is capped off if you have a manual transmission.
The one going to that black tee is your HVAC vacuum supply. One of the other lines on the manifold is supposed to go to the vacuum tree on the engine. The other one goes to your transmission if you have a 3 speed automatic. I would imagine that one is capped off if you have a manual transmission.
I have an OD automatic transmission… I believe that line comes off the engine tree and dives down. I will check. Seeing that every other piece of plastic on this truck has 40 years of brittle built in, would it be wise to swap out that little manifold? I haven’t tried to start this truck yet so it may be fine still… I am just trying to clean and button up everything I can before I get to that point…. I figure to minimize all the points of failure I will need to trouble shoot once I get it started.
Don't change it unless it presents a problem. Changing parts causes problems sometimes. If you have a overdrive automatic, it does not use a vacuum line to shift, it uses a cable or metal rod to the carb throttle for shifting.
Don't change it unless it presents a problem. Changing parts causes problems sometimes. If you have a overdrive automatic, it does not use a vacuum line to shift, it uses a cable or metal rod to the carb throttle for shifting.
I'm glad you said that, I looked to see what vacuum hose was going to the transmission today and could not find any! I was thinking “ oh great, I’m missing an entire vacuum line that goes somewhere “… 😂
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