I had issues accelerating, thread posted here: https://www.crossfireforum.org/forum...eleration.html

What is driving me to this, I chased down the line from the evap purge valve back to the charcoal canaster. I noticed the shield was recently wet and eventually found that overflow line out of the vapor canister. I will need some help here.
I read through this thread:
https://www.crossfireforum.org/forum...-canister.html

I am very hesitant about fixing this mostly it's gas and that kind of work can be dangerous and it's a real mess under the car. In reading the above thread, I don't think there was ever a resolution. Here is my picture dump of what I found.

I pulled the pan and noticed the wet at the end.


Yech

The fuel filter had been replaced sometime in the past. Notice the screw clamps instead of the factory perm clamps.

NASTY Fuel filter and fuel pump

Here is a picture of the charcoal canister. Notice the cleaner spot in the center from the outlet. Yeah gas was coming out.


more nasty

I tilted the outlet line and got gas dumped over my right arm.

Nothing like the tingles of gas on your arm.


I cleaned up the shield cover and reduced the nasty.



I put the shield back on and decided this would be best handled on another day.

 

The first thing is to get rid of every screw clamp and install high pressure fuel injection type clamps.
I'm not sure, but you might be able to do this without removing the lines. (Remove the bolt place it over the line, put the bolt back in. Slide it down near the screw clamp and remove the screw, then the clamp. Slide the new one to where the old clamp was and tighten).
I read the thread you linked to as well today and the O.P. found out that it was the purge solenoid valve causing his trouble.

 

That definitely looks like a vapor issue—could be a saturated canister or a stuck purge valve. I’d be cautious too; maybe time to get a second set of eyes on it from a shop with evap system experience.

 

Both, thanks for the reply. OP on the reference thread answered and yes it was the canister purge valve, not the be confused with the vapor purge solenoid (engine bay). As for clamp, I will be replacing them all with proper high pressure clamps. I have been collecting them since I did my oil catch can mod. As for doing this repair, I will get it done myself. I had asked for advice on minimizing gas spillage on repairing the canister.

 

As for minimizing the spillage from the canister, I don't know if this will work or not, maybe try using a non electric vacuum pump. Get some long tubing and put it into where it was leaking from and try pumping out what you can.
I hope this helps.

 

Latest updates. I tried to put gas into my car over the weekend so GF and I could attend a July 4th party. Alas, the gas tank refused to take and gas and was closed off by check valve. My fuel tank indicated showed at a qtr tank. So Saturday night we just drove around with the top down enjoying the cooling air just to burn the gas down. We finished with frozen confections at Sonic.


I need to get a camera down the neck and take some pictures. I will have to remove my EVAP canister and drain all the gas out. What a mess. Here is a schematic of the Evaporation control system and fuel lines.

Fuel System


Canister and Fuel Tank


Why can't I fill up with gas?
High pressure in the tank closing the fuel filler check valve. (Second picture item 4) This is a strong possibility as gas in the canister is blocking vapor flow.

So what is causing the fuel to get into the canister?
Possibilities:
1) Over fueling. I consider this unlikely as there are systems in place. (Second picture item 1) The tank are rollover valves close when the tank is near full.
2) The fuel filter is damaged causing gas to go into the canister. (First picture item 7)
3) The purge valve is sucking gas into the canister (First picture item 11). This could only work if the rollover valves are open.

Any ideas or suggestions will be welcome.

 

What happens when you try to pump the gas? Does the pump handle keep clicking off?
I wonder what would happen if you poured a small amount in the filler neck, like 8 ounces from a bottle. Would it drain passed the check valve?
Excuse my ignorance on this, but most of the cars I've worked on prior to this were old muscle cars.

 

What happens when you try to pump the gas? Does the pump handle keep clicking off?
The neck quickly fills up with gas and the pump shuts off.

I wonder what would happen if you poured a small amount in the filler neck, like 8 ounces from a bottle. Would it drain passed the check valve?
Once the neck fills up, there is some kind of bypass to allow the gas to drain from the neck. I suspect it's around the gas float shutoff.

As for ignorance, we are all in the dark with obscure issues like this. The purpose of this forum is to learn and keep these cars on the road.

I took some pictures last night. I use my cheap endoscope to take a look see down the gas filler neck.

Once the camera is down the neck, this is first adventure. I have no idea of what this could be. I suspect it's to get the flow of the gas straight or support for the neck.

First Obstacle

Once you get past that then you find the second obstacle which is the fuel filler tube check valve.


Second Obstacle


The last item must be the fuel tank overfill check valve.

The third and last Obstacle

I suspect it's closed and not allowing gas to flow by. I might want to take some more pictures again once I get the gas out of the car.

 

Thanks for the pictures. I think you're right about the overfill check valve. Everything else is clear down to that. Now comes the big question of how to free it up.

 

I have ordered an articulating endoscope and I want to get better pictures. I suspect once I get the pressure out of the tank, it might release. That might be a this weekend project as I need to get the car up on jacks again so I can access that space.

 

I have a new articulating endoscope, I suspect, my original guess of the some of the parts is wrong. I believe I am looking at the tank inside.


I believe this the check valve for over filing. The openings on the side might be items that close the valve.



The top of the tank



That has to be the gas in the tank


More gas and possible the overfill going down




I have no idea what is this


Inside that thing

 

What amazes me is that you can get a scope all the way into the tank, but it won't allow you to put gas in it. It's such a strange problem.

 

Tank pressure vent, IMHO

 

Try to read these in order. They are jumbled up for some reason. Especially post 22.

https://www.crossfireforum.org/forum...anister-2.html

 

That very same link is in the first post of this thread. : https://www.crossfireforum.org/forum...tml#post998935

I think there is two problems 1) There is gas in the charcoal canister. 2) I can't fuel up the car as the neck fills up fast and shuts off the pump.
I suspect the problems are closely related. I can see how a loaded charcoal canister can kill the car from running as it sucks gas from the canister. I don't see how the gas got into the canister in the first place. I am putting a plan together to remove all the gas from the car and dismantle everything. From there I should be able to get a better idea of the issues.

 

Have you tried asking Rob at Needswings.com or Josh or James at the Mercedesswapshop.com ? Maybe try sending an email out to them and see if they come back with something.
Maybe they have run into this situation before.
Also, remember if you're going to remove the gas, or drop the tank, the vapors are what you have to worry about as far as fire risk. My opinion, would be once you drain the gas let it sit for at least a day and air out.

 

Could this be the problem?

URO Parts Vapor Canister Shutoff Valve | 0004707193

 

I think this is a strong possibility. Again, I really need to take everything back apart, check it, and replace with new parts. That should fix it said by nobody ever! LOL

 

OK I started taking everything apart. This is a capture of the parts to date:

Since I cleaned the cover, there has been more leakage:


Leakage from the charcoal canister onto the shield

I got the fuel filter and and pump off the car. This is the main line draining into gas can.





The left over hoses. I will need to replace the hose bottom left. It goes to the gas tank.




Draining the charcoal canister





Next steps:
Measure the current hoses and get the right size high pressure clamps.
Paint the fuel filter and pump bracket. It needs some TLC.
Test the Canister Shutoff Valve.

Does anybody know the purpose of the canister shutoff valve?

 

I believe needswing has replacement brackets.