Hey everyone

I was tracing the tank vent line that was plugged causing the vacuum on my tank. Rather than drill a hole in my gas fill neck I decided to connect the vent line directly to the canister without any vacuum control mechanisms and pulled out all the emission control hoses. It teed into the PCV line so i had to replace the T with a straight hose.

Here is the canister connection. The hose I connected had a brass orifice that I removed.


​Tank vent connection to canister. Capped the remained nipple.​​​​​​



canister hoses removed and a T replaced with straight hose. There was also a small vacuum nipple on the manifold under the T to cap.

 

I was in the workshop at the marina last night. Surrounded by all these power tools. I decided to drill the hole.

I also disconnected the two vacuum lines on the LH manifold that are used for the canister. The off-idle response was greatly improved.

But I still want to vent the fuel tank, once I have the roll over valve

 

Can you cirlce on the pic where you did the replacement line?

 

I added details to the pictures. Doesn't drilling a hole make a roll over valve ineffective?

 

Nevermind

 

After doing this mod my idle was still over 1000rpm so this led me to the PCV as the problem. I recalled from my Ford days that the Motorcraft PCV flow very little at idle. So I pulled the one out of my Ranger and tried it. It worked very well in the v12. It's the Motorcraft EV 225 and it's found in the 2000 Ford ranger with the 4.0L I tried the Autozone generic replacement PCV and it idled at 1000rpm, so too much flow. The EV 225 works great and fits perfect. Idle around 750 with plenty of adjustment on the AAV.

 

Hello
Just with the picture below, where you have capped it, I believe introduces fresh air into the system


So as the fuel tank expands - it sends the fumes from the fuel tank into the canister, as the fuel tank contracts, fresh air is introduced back into the canister through the capped nozzle and goes back to the fuel tank. (allowing it to breath)

Fumes are captured in the charcoal, When the car starts, it sucks these fumes into the motor

I could be wrong (and have been several times), but I don't see this working correctly

Depending on where you live, you could just disconnect that rubber hose to the steel line, which would make the canister bypassed completely, then put a strainer on it to keep the hornets out

Cheers
Steve.

 

thanks Steve, that's a good observation. The top of the canister also has a vent to atmosphere that is out of the picture so that's what is allowing the canister and tank to breath. I'm essentially using the canister to limit the fuel smell if I vented to atmosphere.