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- #21
Any idea where? I searched the site and these old eyes can't find it?
74 FJ40 fuel vapor line and charcoal canister diagram
- Thread starter shipmag
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- #22
Does it matter what position the canister is in so long as the single port is on top? Can it be bolted to the fender under the dual battery bracket I have to use two batteries? The canister will be sitting at an angle as it's bolted to the slant of the vender.
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- #23
Which direction is the blocked port of the check valve are go to canister or fuel tank? when you blow one end it's open the other end of the check is blocked by the check and can't blow through it.
Go to gas tanks, 72-78 tanks. It shows 2 pics. 1 of the tank and 1 of hook ups. Click on it.
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- #25
I need help please. I'm having time trying to figure the hose routing from the charcoal canister. The top of separator goes to the check valve then to the solid line in the floor by the gas tank to the engine compartment. Where does it go from top of the separator to that hard line in the engine compartment?
Where does the line in the bottom of the charcoal container go to?
Where does the top two ports on the charcoal canister go to? Does it matter which port the lines go to that go to the top of the canister?
There is a hardline running on the firewall in the engine compartment from driver side hardline to the passenger side. Where does the passenger side go to and the driver side go to?
The check valve blocked side goes towards the separator?
Where does the line in the bottom of the charcoal container go to?
Where does the top two ports on the charcoal canister go to? Does it matter which port the lines go to that go to the top of the canister?
There is a hardline running on the firewall in the engine compartment from driver side hardline to the passenger side. Where does the passenger side go to and the driver side go to?
The check valve blocked side goes towards the separator?
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- #26
I can't find the ccot reference you referring to please send me a url by going to the page your referring to then copy the url and paste it back to me please?
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- #27
I drew an arrow of the two lines I need help with as to where the other end connect to not shown in the pic?
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- #28
@shipmag
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- #30
Thank you
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- #31
Ok so I completely finally understand the separator and the gas tank. Thank you for your patience and finding the ccot diagram.
I did get the old check valve installed on the tube going through the floor and to the bottom of the canister. The blocked end of the check valve goes to the top of the separator and the open end you can blow through goes to the tube going through the floor connect to the bottom of the canister is that the correct orientation of the check valve?
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- #32
Can the hard tube on drivers side connect to a plugged port on the bottom of the carb right above the mixture screw on a Weber 38Dgas, and the other end just goes to one of the ports on top of the charcoal canister? That then supplies the vacuum for the vapor recovery?
Where does the other port on the canister connect to?
Where does the other port on the canister connect to?
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- #33
My Weber 38DGAS carb does not have a return line going back to the gas tank. The line going back to the tank as a return line had been plugged. I use a stock oem pump recently replaced. Is this the correct thing to do for the Weber 38DGAS?
Glad to see this post. Been trying to find out where the hoses go to bypass the vacuum switch but got no responses. Would be nice to get pictures of the reroute layout.
You might dig in the 60's section. Maybe the giant "Desmog" thread. Warning, it's 60 pages! IIRC, the VSS went NLA then someone figured out a newer VSS number works, you just have to swap the vacuum port routing.
In a nut shell, I was going to put in a vacuum switch (BVSV) into one of my thermostat housing ports. The BVSV sources vacuum from the intake manifold. When the thermostat warms up, the switch opens and routes that vacuum to the VSS. The VSS opens then draws from the charcoal canister and sends that air into the carb/intake port of your choice.
Prior to the BVSV opening, all the fuel vapors are trapped between the fuel tank and the closed VSS. So the system is closed, and with fuel a functioning OEM fuel cap, essentially a sealed system. No odors.
My VSS and BVSV are buried on my workbench somewhere. And have been for years. So I have no photos to offer up.
All this is off the top of my head. I'm sure someone smart will be along soon to tell you how it actually works.
In a nut shell, I was going to put in a vacuum switch (BVSV) into one of my thermostat housing ports. The BVSV sources vacuum from the intake manifold. When the thermostat warms up, the switch opens and routes that vacuum to the VSS. The VSS opens then draws from the charcoal canister and sends that air into the carb/intake port of your choice.
Prior to the BVSV opening, all the fuel vapors are trapped between the fuel tank and the closed VSS. So the system is closed, and with fuel a functioning OEM fuel cap, essentially a sealed system. No odors.
My VSS and BVSV are buried on my workbench somewhere. And have been for years. So I have no photos to offer up.
All this is off the top of my head. I'm sure someone smart will be along soon to tell you how it actually works.
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- #36
I'm not clear what was your final fix for connecting the canister to the carburetor? You mention the BSVS and VSS valves are on work bench for years so how did you hook up your canister?
MAR FJ40
SILVER Star
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- #38
Wow your schematic I understand the hook up shown but it's contrary to others schematics that led me to the separator connecting to the bottom of canister and the top connecting to the manifold. I was wondering what the second port on top of the canister connected to? Compare engineer8000 schematic to the one Mark FJ40 just posted. Which is right to me the fumes need to be pulled through the charcoal. So the bottom can't be atmosphere otherwise the fumes would not be pulled through the charcoal but bounce across the top of the charcoal? Just want a discussion on the proper way to connect the canister so the charcoal can absorb the fumes until pulled through to the manifold?
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I never connected it. Once I hooked up the EVAP to the charcoal canister, I “temporarily“ just ran the output line to a small filter that vents to the atmosphere. I then ordered the VSS and BVSV. But by the time the parts arrived, all fuel smell complaints stopped. Subsequently, so did my effort.
As noted above, since that check valve leading to the carb is holding .5 psi in the fuel tank that stopped the order enough that no one smelled anything.
Some photos…
Here I’m holding back my ultra-cool plug-in trailer wiring harness (Coolerman) showing the charcoal canister output hose that goes to the hard line that crosses the firewall.
Now I know why I can’t find the BVSV on my bench. I forgot I had installed it! It’s the purple thing that has two caps on it.
My charcoal canister line terminates at this filter. The empty black bracket behind it is for the VSV. It’s off a 60 series I think.
Here I’m holding back my ultra-cool plug-in trailer wiring harness (Coolerman) showing the charcoal canister output hose that goes to the hard line that crosses the firewall.
Now I know why I can’t find the BVSV on my bench. I forgot I had installed it! It’s the purple thing that has two caps on it.
My charcoal canister line terminates at this filter. The empty black bracket behind it is for the VSV. It’s off a 60 series I think.