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Vacuum Question
#1
I just installed the canister that traps the vapors from the gas tank.

Of course the vapor then moved in to the ERG, but I no longer have the ERG, where should it go?







[Image: Canister.jpg]

Thanks

Tim
Tucson, Az
1973 SportsRoof
351C bored .040
Crank .020  and Stock cam
Flattop pistons
Edelbrock 4bbl CARB 800 CFM ELEC CHOKE
Edelbrock Performer 2750 Intake Manifold

[Image: NewPrimedHood_zpsw2jaj0cu.jpg]
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#2
run it to the underside of the Air cleaner housing so that when you start the car any fumes are pulled into the carb

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
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#3
That looks like a regular vacuum reservoir. The fuel vapor canister has a small hose that connects to the vent line from the tank and a large hose that connects to the air cleaner base. The fuel vapor canister is also filled with charcoal granules and is typically blue.

You can see a picture in this thread:
https://www.7173mustangs.com/thread-vac-can-mystery



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#4
(02-14-2017, 06:06 PM)Don C Wrote: That looks like a regular vacuum reservoir. The fuel vapor canister has a small hose that connects to the vent line from the tank and a large hose that connects to the air cleaner base. The fuel vapor canister is also filled with charcoal granules and is typically blue.

You can see a picture in this thread:
https://www.7173mustangs.com/thread-vac-can-mystery

That is what was connected to the vapor line from the gas tank - when I removed it.  The large line came to can from the gas tank and the the small line when to the egr valve.   Doesn't mean it was correct but that's how the was driven.   There is no other canister.

It was black when I removed it and I repainted black.

What am I missing?

BTW the link doesn't work  https://www.7173mustangs.com/thread-vac-can-mystery

Thanks

Thanks

Tim
Tucson, Az
1973 SportsRoof
351C bored .040
Crank .020  and Stock cam
Flattop pistons
Edelbrock 4bbl CARB 800 CFM ELEC CHOKE
Edelbrock Performer 2750 Intake Manifold

[Image: NewPrimedHood_zpsw2jaj0cu.jpg]
  Reply
#5
The hose that runs from the vapor canister to the air cleaner is 3/4" diameter.

Try this one:
https://www.7173mustangs.com/thread-vac-...r+canister



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
  Reply
#6
(02-14-2017, 07:36 PM)Don C Wrote: The hose that runs from the vapor canister to the air cleaner is 3/4" diameter.

Try this one:
https://www.7173mustangs.com/thread-vac-...r+canister

That was perfect.    So clearly mine was not connect properly and the Vapor canister is missing.

Thanks

Tim
Tucson, Az
1973 SportsRoof
351C bored .040
Crank .020  and Stock cam
Flattop pistons
Edelbrock 4bbl CARB 800 CFM ELEC CHOKE
Edelbrock Performer 2750 Intake Manifold

[Image: NewPrimedHood_zpsw2jaj0cu.jpg]
  Reply
#7
Going back and looking at the videos I took while take everything out of the engine bay, show that the previous owner used the vacuum can as a replacement for the charcoal canister. There was no heater core and the A/C was removed so there wasn't any need for the cooling/heating system to be functioning.

I just need to pick up a charcoal canister now.

Oh...Yikes....$150?

Thanks

Tim
Tucson, Az
1973 SportsRoof
351C bored .040
Crank .020  and Stock cam
Flattop pistons
Edelbrock 4bbl CARB 800 CFM ELEC CHOKE
Edelbrock Performer 2750 Intake Manifold

[Image: NewPrimedHood_zpsw2jaj0cu.jpg]
  Reply
#8
I might have one. I can do some digging this weekend. It will need some new paint I'm sure if I have one. I will PM you if I find one. Yours for shipping only if I have it and you want it.

73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

- Jason


[Image: 082-hot-rod-power-tour-2017-1970-1970s.jpg]
  Reply
#9
(02-15-2017, 08:22 AM)73pony Wrote: I might have one. I can do some digging this weekend. It will need some new paint I'm sure if I have one. I will PM you if I find one. Yours for shipping only if I have it and you want it.

Jason,

Thanks.  I dropped you a PM.

Tim

Thanks

Tim
Tucson, Az
1973 SportsRoof
351C bored .040
Crank .020  and Stock cam
Flattop pistons
Edelbrock 4bbl CARB 800 CFM ELEC CHOKE
Edelbrock Performer 2750 Intake Manifold

[Image: NewPrimedHood_zpsw2jaj0cu.jpg]
  Reply
#10
the black canister is the A/C vacuum reserve canister

the Blue canister is the Fuel Vapor Return Charcoal canister.

the blue canister is used to vent the main fuel tank and prevent implosion from occurring due to negative atmospheric pressure in the main fuel tank caused by the fuel pump sucking out the fuel going to the engine. the Venting is then captured by the fuel vapor return canister and sucked out when the engine is started up through the air cleaner base. when vacuum is high the fuel vapor canister is sucked out, when vac drops like accelerating then it dumps air back into the fuel tank it all equalizes
since it is venting and exchanging air. the vapor return canister also helps keep the fuel from going bad, stops rust from forming as it also sucks moisture out of the tank.
This was changed due to emissions laws originally mustangs used a vented gas cap in 71 the law required the fuel vapor to be captured and then it made sense to make the engine reuse the vapor through the intake. so previous mustangs did not have this canister. for 71-73 this fuel venting also captured venting from the original carb fuel bowls. hence a larger hose from the fuel tank goes to the can and a smaller from the carb goes to the can then a larger paper/foil hose connected to the air cleaner base that sucked the vapor through a filter into the intake and down into the engine to burn. as a side effect this also gets rid of that fuel smell old cars have when sitting around and the fuel vents into the garage and car interior.

Also in case of roll over and the car ends up upside down the canister holds fuel from draining from the tank to the engine bay where a fire can start.


honestly all around it is a good thing.



The black A/C vacuum reserve canister job is to keep a reserve of Vacuum (similar to the brake vacuum booster) for running the A/C system and helping to compensate for the slight vacuum leak the A/C system causes. it drives the Vacuum motors for the A/C system and acts as a buffer for vacuum loss and engine backfire protection.
When you accelerate and vaccum drops a properly working A/C vacuum reserve canister will stop the A/C system from shutting off and turning back on as vaccum builds at idle. it takes vacuum load off the engine as well when accelerating.
there is a reed valve inside the can that goes bad over time. so if you accelerate and you feel the A/C system stop blowing air then it comes back replace the A/C vacuum reserve canister the reed valve is blown, you can also test it manually blow air into the can and then try and suck it out, the reed valve will only allow air to flow one way, if you can blow and suck air out the reed valve is blown. the blown reed can also act like a slight engine stumble when heavy accelerating, because suddenly the vacuum drops more then it should and acts like a vaccum leak.
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