90 YJ vacuum leak at canister. HELP!!! - JeepForum.com

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post #1 of 23 Old 02-20-2012, 06:23 AM Thread Starter
dndmicks
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1990 YJ Wrangler 
 
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90 YJ vacuum leak at canister. HELP!!!

Hey Guys,
I have installed a ford 2150 Carb recently and man what a difference it made. I have done the nutter bypass and the team rush upgrade. now for the carb i have routed everything like the instuctions tell me but when i T off the PCV valve to the carb then to the canister filter the jeep wont run. When I disconnect the canister it will run and idle great. I have however replace all the vacuum line to take that out of the issues any ideas? maybe the canister is no good?
Thanks

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post #2 of 23 Old 02-20-2012, 06:58 AM
jdanthony
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Ur Pcv should run right to the bottom of the carb, distributed advance vac to side of carb with a T to ur Cto. The canister should go to manifold vac ... I have a few drawing and pix that may help u lemme try and find them they helped me alot!
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post #3 of 23 Old 02-20-2012, 07:05 AM
MaddBones702
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One thing to look at since I've been through this battle... Make sure your lines on the canister are correct and use the plastic vacuum line adapters to step up step down. My PVC line does t into the line on the back of the carb. One line to the PVC one to the canister. Use starter fluid to check for leaks.

Who knew where this would go?
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post #4 of 23 Old 02-20-2012, 07:21 AM Thread Starter
dndmicks
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Quote:
Originally Posted by MaddBones702 View Post
One thing to look at since I've been through this battle... Make sure your lines on the canister are correct and use the plastic vacuum line adapters to step up step down. My PVC line does t into the line on the back of the carb. One line to the PVC one to the canister. Use starter fluid to check for leaks.
So does mine. thats where the issues are if i dont T to the canister it runs like a top. Im thinking maybe a leak in the gas tank vent line? Im gonna block that and retry.
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post #5 of 23 Old 02-20-2012, 07:36 AM
jdanthony
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A friend of mines was leaking at the fuel pump, we replaced and found that it was shot and bam! Runs great!
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post #6 of 23 Old 02-20-2012, 07:43 AM Thread Starter
dndmicks
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Quote:
Originally Posted by jdanthony View Post
A friend of mines was leaking at the fuel pump, we replaced and found that it was shot and bam! Runs great!
is the Fuel pump in the Tank?
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post #7 of 23 Old 02-20-2012, 07:44 AM
jdanthony
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It u have the 4.2 it just in front of the distributer
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post #8 of 23 Old 02-20-2012, 07:47 AM
jdanthony
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These might help
Attached Thumbnails
image-703226403.jpg   image-4059749727.jpg  
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post #9 of 23 Old 02-20-2012, 08:09 AM
MaddBones702
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Spray down at the canister with it running. If you hear idle Change you have to solve the leak. Also, replace any old nasty lines.

Who knew where this would go?
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post #10 of 23 Old 02-20-2012, 08:17 AM
NonRubicon
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The emissions canister is not supposed to vent while at idle. If the valve that controls the venting gos bad, you'll end up with a nice vacuum leak.

I've diagnosed a faulty canister doing this simple test: Hook up all the lines as they should be connected. Try pinching off the purge line that feeds the canister vapors to the carb - if the idle smooths out, the canister is likely bad (that is, the valve that controls the venting is bad).

They don't make the OEM style canisters for the 258 anymore, but a canister from a 4.0L can be adapted to work.

BTW, if you are still running a stock fuel pump, it is located on the passenger side of the engine block.
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post #11 of 23 Old 02-20-2012, 11:17 AM Thread Starter
dndmicks
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Quote:
Originally Posted by NonRubicon View Post
The emissions canister is not supposed to vent while at idle. If the valve that controls the venting gos bad, you'll end up with a nice vacuum leak.

I've diagnosed a faulty canister doing this simple test: Hook up all the lines as they should be connected. Try pinching off the purge line that feeds the canister vapors to the carb - if the idle smooths out, the canister is likely bad (that is, the valve that controls the venting is bad).

They don't make the OEM style canisters for the 258 anymore, but a canister from a 4.0L can be adapted to work.

BTW, if you are still running a stock fuel pump, it is located on the passenger side of the engine block.
Thanks Bro
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post #12 of 23 Old 02-20-2012, 11:27 AM Thread Starter
dndmicks
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where is the canister valve back by the fuel tank?
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post #13 of 23 Old 02-20-2012, 01:05 PM
MaddBones702
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Under the washer bottle drivers side inside engine compartment

Who knew where this would go?
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post #14 of 23 Old 02-20-2012, 01:10 PM Thread Starter
dndmicks
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Quote:
Originally Posted by MaddBones702 View Post
Under the washer bottle drivers side inside engine compartment
Not the canister the check valve. I do see that its on the fuel tank it self but The jeep dealer says on my 15gal tank there is not one. whats up with that.
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post #15 of 23 Old 02-20-2012, 03:35 PM
MaddBones702
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If you are looking at the charcoal canister looking at where the 4 lines go in it is the one all the way to the right. It's the one with the quarter shaped dial on top. Under the washer bottle.

Who knew where this would go?
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