[khomer2]

Check your shut off valve.

Older thread:

Car won't take gas!!!

Hi everyone. I have searched the forum and also searched around on the internet with no luck. Maybe someone here can help me or guide me in the right direction as what to check or replace. Yesterday I went to the gas station to fill-up, upon opening the gas cap I heard a loud "wooosh" type...

www.benzworld.org

 

[Georj]

Check your shut off valve.

Older thread:

Car won't take gas!!!

Hi everyone. I have searched the forum and also searched around on the internet with no luck. Maybe someone here can help me or guide me in the right direction as what to check or replace. Yesterday I went to the gas station to fill-up, upon opening the gas cap I heard a loud "wooosh" type...

www.benzworld.org

Where is it? Never he

Check your shut off valve.

Older thread:

Car won't take gas!!!

Hi everyone. I have searched the forum and also searched around on the internet with no luck. Maybe someone here can help me or guide me in the right direction as what to check or replace. Yesterday I went to the gas station to fill-up, upon opening the gas cap I heard a loud "wooosh" type...

www.benzworld.org

Where is the shut off valve located. What function does it provide.

I forgot to mention I am also getting P0400 and P0450 codes with CEL on

 

[khomer2]

Learn to.......

Community Search, at the top of the thread:
example: Fuel shutoff valve help

One topic/issue per thread. Start a new thread on your error codes.

 

[Georj]

Learn to.......

Community Search, at the top of the thread:
example: Fuel shutoff valve help

One topic/issue per thread. Start a new thread on your error codes.

The error codes are related to this P0450 is related to EVAP pressure sensor

 

[Georj]

Found this excellent video on how the gas tank evaporative system works on W202

 

[khomer2]

You need to address this first.
When fixed, your code should disappear.

 

[Jagpilot]

If you are a nerd, you may want to watch this:

 

[Georj]

Today I took the car to a mechanic who was kind enough to use his computer on the car. We got following code:

P0450-28 Fuel Tank Pressure Sensor (B4/3)
Purge Monitoring Pressure Sensor (B4/4)

If I am not mistaken the B4/4 is the purge sensor in the engine that I was playing with (photo included in above post). I had it unplugged for a while while I was checking it. It appears to be working. I think the culprit is B4/3 that I think is some where in near the neck of the fuel tank at the back. The mechanic would not quote me an estimate to fix and said it could be anything and he will have to diagnose the problem. He said it could be a simple ground connection missing to replacing everything. Can an expert on this forum give me the location of B4/3 and confirm that B4/4 is the sensor in the canister vapor purge sensor in the engine. Appreciate the help.

 

[Georj]

UPDATE: I apologize I should have posted this update earlier. The problem has been fixed.
I disconnected the cannister purge valve and tried to clean it by blowing into it and left it out in the open overnight. I also removed the gas cap and but a plier in hole to keep the flap open for couple of hours. I drove the car for a day without the cannister purge valve. Yes got ECL and all sorts of codes. Connected the CPV and the problem is fixed. No more issues filling gas. Reset the codes and all codes gone

 

[[email protected]]

Nice, maybe I'll have to try that. I have the same issue but it will allow me to fill gas, I just have to hold the pump to the fill hole really tight the entire time. I cleaned the purge valve on mine and the problem still persists. (It never looked too dirty in the first place.)

So by removing the gas cap and opening the flap and letting it air out, is that supposed to evaporate any gas that might have flooded the charcoal canister? Which in turn, caused your issue?

 

[Georj]

Nice, maybe I'll have to try that. I have the same issue but it will allow me to fill gas, I just have to hold the pump to the fill hole really tight the entire time. I cleaned the purge valve on mine and the problem still persists. (It never looked too dirty in the first place.)

So by removing the gas cap and opening the flap and letting it air out, is that supposed to evaporate any gas that might have flooded the charcoal canister? Which in turn, caused your issue?

I read about this trick of leaving the gas cap off and letting the air escape somewhere online or maybe on this forum. When you do that make sure you stick a screwdriver or plier end into the gas filler hole to keep the flap open. I also drove the car for a day with the purge valve removed. I could smell gas in the car and got all sorts of code. But that may have also helped in clearing any clogging.