P0440 Evap System
P0440 Evap System 99 Z28 with all the problems in the world.
Its got a SES for a P0440 and I already replaced the Gas Cap with a AC Delco unit and the problem is still recurring. This problem is also strange, I only get this code when I'm down to about 1/4th tank of fuel, but I have to pass emissions so I need to fix it.
What is the common cause for this issue and the fix for it? Can someone point me to the exact name of the evap canister on the fuel tank?
Its got a SES for a P0440 and I already replaced the Gas Cap with a AC Delco unit and the problem is still recurring. This problem is also strange, I only get this code when I'm down to about 1/4th tank of fuel, but I have to pass emissions so I need to fix it.
What is the common cause for this issue and the fix for it? Can someone point me to the exact name of the evap canister on the fuel tank?
Staging Lane
Joined: Jul 2012
Posts: 63
Likes: 1
From: Ohio
If you are in a big hurry to pass emissions just clear the code and make sure your tank is full when you get inspections done.
Not sure on the fix though. I had that code last summer and a new generic gas cap fixed it.
Not sure on the fix though. I had that code last summer and a new generic gas cap fixed it.
Staging Lane
Joined: Jul 2012
Posts: 63
Likes: 1
From: Ohio
I did a quick search for P0440 and found this. It is very informative and should help you.
https://ls1tech.com/forums/general-m...ap-system.html
https://ls1tech.com/forums/general-m...ap-system.html
I did a quick search for P0440 and found this. It is very informative and should help you.
https://ls1tech.com/forums/general-m...ap-system.html
https://ls1tech.com/forums/general-m...ap-system.html
A fuel tank vent?
A EVAP cannister purge valve which is located under the Fuel Tank?
and another EVAP cannister purge valve on the Intake? meaning we have two of them? or am I missing something?
Staging Lane
Joined: Jul 2012
Posts: 63
Likes: 1
From: Ohio
No there's only one EVAP canister located in front of the left rear wheel. There are pics of it in that thread. They also talk about the rest of the EVAP system and show pics of parts that can go bad and cause a P0440 code.
And can I get part numbers for the EVAP Canister infront of the left rear wheel? I'm assuming this is probably the part thats bad as it appears only the 98's had the Fuel Vent in the vulnerable area, if not though does the fuel tank have to be dropped to access the Fuel Vent? (I'm very hesitant about drilling the trap door above my fuel lines)
Staging Lane
Joined: Jul 2012
Posts: 63
Likes: 1
From: Ohio
I was thinking it may be a good idea for you to go to the library and get a repair manual for your car. It may help quite a bit.
There is a ton of info here at LS1Tech about the EVAP system and code P0440. Maybe a search and the repair manual together will help.
There is a ton of info here at LS1Tech about the EVAP system and code P0440. Maybe a search and the repair manual together will help.
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I actually did search for the evap cannister on LS1 tech but I am still a little confused on the subject because there are several parts involved and I can't find which part number refers to the device near the axle (or if
I saw this part on Rock Auto:
It costs $14.04 - but it also states an additional wiring harness adapter is needed because GM changed the part. It appears to cover the following PN's (10293954, 13575703, 2141690) I am THINKING this is the part you were talking about but I'm not 100% sure.
I also saw this:
This is much pricier but is listed as the Evap Cannister (I'm thinking it really meant Evap Charcoal Cannister) and I BELIEVE its located ontop of the fuel tank. per this thread: https://ls1tech.com/forums/general-m...ment-help.html
Once again Im not 100% sure but any confirmation would be greatly appreciated.
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Verdad Gallardo Staging Lane
Joined: Jul 2012
Posts: 63
Likes: 1
From: Ohio
Well one thing I would do is check and make sure that the canister is indeed the problem. I know that a vacuum leak can cause that code. Maybe just take a quick look around your canister and see if anything looks suspect.
Ok so I finally got a chance to get under the car and have a look... I didnt really see the fuel vent or evap cannister...
This photo of the body harness connectors and the fuel vent hose is npt extended to this bracket...
whats that hose at the top that has nothing connected to i indicated bybthe red circle? That photo was taken looking directly up at the fuel tank.
This photo of the body harness connectors and the fuel vent hose is npt extended to this bracket...
whats that hose at the top that has nothing connected to i indicated bybthe red circle? That photo was taken looking directly up at the fuel tank.
At minimum You need a scan tool to with output controls to diagnose this ..
You may need a smoke machine ....
440 is a evap leak
Vent valve that is suck open or won't shut all the way ...
Purge valve that is working incorrectly ..
Fuel tank psi sensor reading incorrectly ...
As a rule it's not the canister or fuel cap ??
It can be but unlikely
Not sure if your in the rust belt but that could open a whole other can o worms
Rusty fuel,filer rusty fuel tank or sender
You may need a smoke machine ....
440 is a evap leak
Vent valve that is suck open or won't shut all the way ...
Purge valve that is working incorrectly ..
Fuel tank psi sensor reading incorrectly ...
As a rule it's not the canister or fuel cap ??
It can be but unlikely
Not sure if your in the rust belt but that could open a whole other can o worms
Rusty fuel,filer rusty fuel tank or sender
At minimum You need a scan tool to with output controls to diagnose this ..
You may need a smoke machine ....
440 is a evap leak
Vent valve that is suck open or won't shut all the way ...
Purge valve that is working incorrectly ..
Fuel tank psi sensor reading incorrectly ...
As a rule it's not the canister or fuel cap ??
It can be but unlikely
Not sure if your in the rust belt but that could open a whole other can o worms
Rusty fuel,filer rusty fuel tank or sender
You may need a smoke machine ....
440 is a evap leak
Vent valve that is suck open or won't shut all the way ...
Purge valve that is working incorrectly ..
Fuel tank psi sensor reading incorrectly ...
As a rule it's not the canister or fuel cap ??
It can be but unlikely
Not sure if your in the rust belt but that could open a whole other can o worms
Rusty fuel,filer rusty fuel tank or sender