There are 2 plastic vacum lines coming from the charcoal canister, going over the exhaust manifold. Looks like they would go into something on the intake. What?

My car is an 88 if it matters.

I am putting a stealth ram on the car.

 

Top line is suppose to go to your Throttle Body, and the bottom goes to the Fuel Tank Pressure Valve, and then to the Fuel tank.

 

I don't think those are the ones I am talking about. There is one nose, which comes off of the canister about 6" then there is a round "valve" looking theing, and it tees into two lines. These two lines are hard molded plastic, one is larger than the other, they are shaped to go back and to the engine, over the manifold, over the valve cover, and then bend down, pointing straight down to the intake manifold, in about the left center. Both lines run together.

 

The one from the round black thing is going to the Fuel tank. That is the Fuel Tank Pressure Control Valve. That lets the fuel vapor from the tank go into the EVAP canister. The top of it has a smaller line running out of it and they T together into the line that runs to the EVAP canister. The idea is that when the canister gets the signal from the puter to energize and purge the vapor, it applies vacuum to those tubes, and the Fuel Tank Pressure Valve opens letting vapor go from the tank into the canister.

The other line is hard black moulded vacuum line that is suppose to go to the Throttle Body.

 

Okay, here is what i am dealing with;


Top of charcoal canister has 1 large nipple, which it says "AIR" near it on the canister, this one had a vacum plug on it.

A Square box about 1" on top of the canister has 2 nipples one on top of other, the lower nipple has a hose which goes into a valve which then leads back to the tank.

The upper nipple on this little box, goes out about 6" then into a round valve, which then tees into these 2 black preformed hard plastic lines, one being larger than the other. These wo lines are taped together, and are molded the same, and goe to the same area, They seem to route to the rear area of the intake. Definatly not to the throttle body.


What I need to know, is what to do with these and what to do about the nipple that had a vacume cap on it.

 

New Albany Indiana,....I'm in jeffersonville. How kewl. So the ones going over the exhaust manifold, are they connected to anything?

 

The Fuel Tank Control Valve should be in line with the fuel tank. Thats the black round thing with the little hose taped into the big hose on one end and just the big hose on the other end. This valve is suppose to let vapor into the canister when it reaches a certain pressure.

The inlet labled "AIR" on the EVAP is an air inlet, and is suppose to provide the canister with ambient air. Mine looks like it has a protective cover over it, not a plug.

So long as the top tube goes into the intake.. i guess it should work. All vacuum comes from the intake, and when it draws the fuel vapor up it will just draft it down the runners and into the combustion chambers anyhow.


So, it should go, From the Fuel tank, to the Fuel Tank Pressure Control Valve, to the bottom inlet on the Canister Solenoid Assembly. The Top inlet should go to the intake. On my car, it goes to the Throttle Body. Can you take a picture of where yours is going? I'll try to take a pic of my car tomorrow morning and then try to figure out how to post it.

 

Yes, it will work, but not as desigend.
There's 2 types of vacuum; full, and ported.
Full vacuum is developed below the throttle blades and is on all the time during idle. Ported vacuum is developed above the throttle blades when they open which is off idle, both decrease to zero at WOT.

Mine is also an '88 the larger of the 2 hoses goes to the passenger side of the throttle body, the other goes to a port underneath the throttle body on the driver's side.
Canister is purged with the following conditions:

• Engine run time after start more than 1 minute.
• Coolant temperature above 75 degrees C.
• Vehicle speed above 15 mph.
• Throttle OFF idle

Purged is done OFF idle, so the vapors won't affect idle rpm.

The canister will not purge if the Throttle is ON idle because the purge valve is operated by vacuum, but there's no vacuum at the throttle body at idle (because it's ported vacuum, unless soemone has rerouted it to full vacuum.)

 

transporter, cool, we will have to get together and talk 3rd gens sometime. What does your car look like? I have probably seen it around. Right now those 2 lines are not connected to anything, as I am finishing up a Stealth Ram install.

joker37, The control valve is in the line going to thetank as you state. These other 2 lines also have a similer looking valve.


So, the one labeled 'air' can remain open? Or does it need somethnig on it?

These other 2 lines in question, where should i hook them up? I have a couple open vacum ports on the rear of my stealth ram. Not sure if my TB has any ports on it. i will have to check that out.


So, these both should go to a ported vacum source? Are tghey both needed? It seems redundent to me to have 2 lines here.

 

Is it possible that these two lines go to the EGR valve solenoid?

 

The port underneath the TB driver's side is tee'd to the EGR because EGR is only needed during OFF idle.

 

So, where in fact, do I need to hook these lines up at? Do I need to hook both up? Being that there is only one coming out of the canister, then it splits into two, it seems a bit redundent to run 2 lines.

Can I just hook on up to a vacum poret on the rear of my stealth ram?

 

There's no redundancy.
The Cruise Control Servo, and vacuum reservoir require full vacuum.
The canister purge, and EGR solenoid require ported vacuum.

These pictorials may help.

 

do you have any idea how to hook up the charcoal can if you don't have the computer to trigger the solinoid? I'm swapping to DFI and don't really want to delete it.

 

heres that valve, i just took all that stuff out, redoing vacuum lines, and other stuff, that vapor canister is somewhat heavy!