Charcoal canister setup help

[MAR FJ40]

I have a 76 FJ40 and am installing a Holley sniper EFI, hyperspark distributer, coil and ignition. I have the OEM canister setup with a line ran from the bottom port of the canister back to the fuel separator w/ a check valve. My question is where to route the top two ports on the canister. I searched and haven't been able to find the answer. Thanks

pic from mud on canister...

 

[zerotreedelta]

There's quite a few threads on the evap, and the factory service manual is helpful as well: Adding an evaporative emissions systems to a 2f - https://forum.ih8mud.com/threads/adding-an-evaporative-emissions-systems-to-a-2f.1047046/

I believe the bottom is just open to atmosphere and the top is one to tank (with a check valve inline) and the other to vacuum (but with the thermo valve / VSV inline).

Instead of the VSV, I used the Sniper output pins to control an electric vacuum solenoid to control the vacuum port by coolant temp sensor. Basically either enables evap only after coolant temp is up a bit.

 

[MOTOV8R]

There's quite a few threads on the evap, and the factory service manual is helpful as well: Adding an evaporative emissions systems to a 2f - https://forum.ih8mud.com/threads/adding-an-evaporative-emissions-systems-to-a-2f.1047046/

I believe the bottom is just open to atmosphere and the top is one to tank (with a check valve inline) and the other to vacuum (but with the thermo valve / VSV inline).

Instead of the VSV, I used the Sniper output pins to control an electric vacuum solenoid to control the vacuum port by coolant temp sensor. Basically either enables evap only after coolant temp is up a bit.

That is a nice way to do it. I just used the ported vacuum on the sniper, so that it only enables when rpm rises (off idle).

 

[MAR FJ40]

There's quite a few threads on the evap, and the factory service manual is helpful as well: Adding an evaporative emissions systems to a 2f - https://forum.ih8mud.com/threads/adding-an-evaporative-emissions-systems-to-a-2f.1047046/

I believe the bottom is just open to atmosphere and the top is one to tank (with a check valve inline) and the other to vacuum (but with the thermo valve / VSV inline).

Instead of the VSV, I used the Sniper output pins to control an electric vacuum solenoid to control the vacuum port by coolant temp sensor. Basically either enables evap only after coolant temp is up a bit.

Thanks for the reply. I must have misread the bottom feed venting to atmosphere somewhere along the line.

 

[MAR FJ40]

That is a nice way to do it. I just used the ported vacuum on the sniper, so that it only enables when rpm rises (off idle).

So you just run a direct line from the canister direct to the sniper ported vacuum and it's good to go? aka...no vsv?

 

[Fast Eddy]

Thanks for the reply. I must have misread the bottom feed venting to atmosphere somewhere along the line.

Factory setup is a hose that dumps into the frame tub so any drips of fuel would drip in there to evaporate instead of onto the ground to evaporate.

 

[MOTOV8R]

So you just run a direct line from the canister direct to the sniper ported vacuum and it's good to go? aka...no vsv?

The ported vacuum line goes to a vacuum valve (link below) which will see a vacuum when rpm’s go above idle. That opens the valve and allows the canister to vent to the non-ported vacuum.

So the smaller tube on the valve goes to ported vacuum. The two larger outlets connect to the canister on one side and manifold vacuum on the other.

Standard Motor Products CP112 Standard Motor Vapor Canister Components | Summit Racing

Free Shipping - Standard Motor Vapor Canister Components with qualifying orders of $125. Shop Fuel Vapor Canister Components at Summit Racing.

www.summitracing.com

 

[Engineer8000]

tube to under body support for canister drain, not sure what year this is, yours may be different.

 

[MAR FJ40]

The ported vacuum line goes to a vacuum valve (link below) which will see a vacuum when rpm’s go above idle. That opens the valve and allows the canister to vent to the non-ported vacuum.

So the smaller tube on the valve goes to ported vacuum. The two larger outlets connect to the canister on one side and manifold vacuum on the other.

Standard Motor Products CP112 Standard Motor Vapor Canister Components | Summit Racing

Free Shipping - Standard Motor Vapor Canister Components with qualifying orders of $125. Shop Fuel Vapor Canister Components at Summit Racing.

www.summitracing.com

Great, this helps a lot! Ordered the vacuum valve and I think I have a good idea of the setup now.

 

[Engineer8000]

one top tap runs to a hard line running back along the inside of the rocker then up to the vapor separator, the other runs to a hard line running along the top of the firewall over to the VSV on the driver side fender.

 

[MAR FJ40]

tube to under body support for canister drain, not sure what year this is, yours may be different.

View attachment 4016783

View attachment 4016786

I'll check my old parts, I kept most all of the lines and hoses just in case I needed them for templates. This is very helpful, thanks.

 

[Engineer8000]

under side tubes

 

[Engineer8000]

Not sure of your TB connections for the vent, but this is how I plan to run mine. When the engine is up to temp and off idle, it will draw fumes into the intake manifold.

The later cans have 3 taps on top to accommodate the outer vent control that vents the float bowl.

 

[Engineer8000]

There is also a check valve back where it comes up through the floor. It opens at a specified DP.

I collected a ton of pictures of this stuff because I have to recreate the hard lines for my truck.

 

[MAR FJ40]

The ported vacuum line goes to a vacuum valve (link below) which will see a vacuum when rpm’s go above idle. That opens the valve and allows the canister to vent to the non-ported vacuum.

So the smaller tube on the valve goes to ported vacuum. The two larger outlets connect to the canister on one side and manifold vacuum on the other.

Standard Motor Products CP112 Standard Motor Vapor Canister Components | Summit Racing

Free Shipping - Standard Motor Vapor Canister Components with qualifying orders of $125. Shop Fuel Vapor Canister Components at Summit Racing.

www.summitracing.com

I laid out what I believe my understanding is in the pic below....Does this look right? I also have a Holley Hyperspark Distributer if that matters any (no vacuum line connections)