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Re: EVAP CEL specailists! Help Please, repaced Canister Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Fri, 11 Apr 2008 07:18:40 In Reply to: Re: EVAP CEL specailists! Help Please, repaced Canister, Steve, Thu, 10 Apr 2008 15:19:06 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The line to the gas tank from the canister will only have a vacuum when the EVAP valve is open, which connects the manifold vacuum to the canister. The line from the manifold to the valve on top of the canister should have a vacuum in it when the engine is running at idle. In your previous post, you said that you could suck vacuum on that line when the valve was ticking, which says the valve works and the line is clear.
So I take that to mean you pulled the line off the manifold (throttle body, to be exact) and sucked on it, and could get air to move. From this post, you don't get vacuum on that line from the canister valve end. That implies one of two things-
(1) the hose between the intake manifold/throttle body and the Evap valve is old and soft, and is collapsing under vacuum. This effectively seals it. You can only pull a few psi with your lungs; at idle the engine is pulling 8 or 9 psi, which may cause the hose to collapse, effectively sealing it off. That hose is just a hose - try replacing it and see if that helps.
(2) The hose is attached to the wrong place on the throttle body. There are some blank nipples there - make sure that when you pull the hose off the throttle body and the engine is running, air is being sucked into that nipple.
Be very careful when using a vacuum pump on a fuel tank. Fuel tanks run at a very, very slight vacuum. The tank has a lot of surface area, and pulling too much vacuum could cause the tank to collapse, or at least crinkle.
If I were looking for a leak at the tank, I'd look at the filler system, which has lots of little by-pass and overflow hoses. There can be rotted grommets where the hoses go into the top of the tank.
posted by 192.249....
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