Can anyone give me suggestions on dropping the fuel tank? I have a p0446 and want to check the charcoal canister but I won't be able to get the canister off without dropping the tank it seems like.
Thanks.
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10-01-2010
Can anyone give me suggestions on dropping the fuel tank? I have a p0446 and want to check the charcoal canister but I won't be able to get the canister off without dropping the tank it seems like.
Thanks.
10-01-2010
There is a bolt of one side of each strap, support it remove the straps and drop it.
10-02-2010
That doesn't sound too difficult. What about the fuel pump? Do I need to remove it prior to dropping the tank?
10-02-2010
unplug everything / disconnect fuel drop tank, or take the fuel canister/bucket outOriginally Posted by roundbox52
10-06-2010
FYI there is an access panel in the trunk to get at the fuel pump/evap sol. pull the trunk mat out and its right up by the back seat. there is no need to drop the tank unless it's rotted.
10-07-2010
x2^
I put cars on jack stands and use a piece of plywood on my floor jack to raise and lower the tank... But much easier to open the access panel!
10-07-2010
The tank isn't rotted. I need to drop it because I don't see any way of getting the EVAP charcoal canister off the top of the tank without dropping it. Does anyone agree/disagree?
10-07-2010
Maybe the access panel will provide enough 'access' to remove the evap canister? We will see!
10-07-2010
You removing the canister for weight or are you fixing something in the evap system? I haven't ran the evap on my GTP since I got it, just cut and capped the line... I guess I should take the rest of the crap out the underside too. Dropping the tank isn't bad, I've never done it on a GP but plenty on the strap style tanks. And I can usually drop it to replace a fuel pump and run to the parts store and have it back running in 2-3 hours not rushing...
10-08-2010
I'm removing it to try and locate/fix an EVAP problem p0446. I want to take the canister off and see if any charcoal has escaped or if anything is blocking the vent path. How do you pass inspections if the EVAP system is not working?
10-08-2010
HAHAHA! What are inspections? J/K we don't have any form of them here... Maybe some guys who know for sure will chime in here hopfully, but I know you can delete the codes out of the pcm with a tuner and pass an obd II scan test and I would asume pass a sniffer test since its only function is to keep gas fumes out of the environment and doesn't affect tailpipe emissions. Have you checked the valve itself for proper operation?
Here's some other info I found you can run through if you want:
DTC P0446 Evaporative Emission (EVAP) Vent System Performance
Refer to EVAP Control System Overview .
System Description
This DTC tests the evaporative emission (EVAP) system for a restricted or blocked EVAP vent path. The control module commands the EVAP canister purge valve ON and the EVAP canister vent valve ON. This allows a vacuum to be applied to the EVAP system. Once a calibrated vacuum level has been reached, the control module commands the EVAP canister purge valve OFF and the EVAP canister vent valve OFF. The control module monitors the fuel tank pressure (FTP) sensor for a decrease in vacuum. If the vacuum does not decrease to near 0 inches H2O in a calibrated time, this DTC sets.
The following table illustrates the relationship between the ON and OFF states, and the Open or Closed states of the EVAP canister purge and vent valves.
Control Module Command
EVAP Canister Purge Valve
EVAP Canister Vent Valve
ON
Open
Closed
OFF
Closed
Open
Conditions for Running the DTC
DTCs P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0440, P0442, P0443, P0449, P0452, P0453, P1106, P1107, P1111, P1112, P1114, P1115, P1121, or P1122 are not set.
The ignition voltage is between 10-18 volts.
The barometric pressure (BARO) is more than 75 kPa.
The fuel level is between 15-85 percent.
The engine coolant temperature (ECT) is between 4-30°C (39-86°F).
The intake air temperature (IAT) is between 4-30°C (39-86°F).
The start-up ECT and IAT are within 9°C (16°F) of each other.
The vehicle speed sensor (VSS) is less than 121 km/h (75 mph).
Conditions for Setting the DTC
The FTP is less than -10 inches H2O.
The condition is present for as long as 30 seconds.
Action Taken When the DTC Sets
The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
Conditions for Clearing the MIL/DTC
The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.
Diagnostic Aids
An intermittent condition could be caused by a damaged EVAP vent housing, a temporary blockage at the EVAP vent valve inlet or a pinched vent hose. A blockage in the vent system will also cause a poor fuel fill problem.
Test Description
The number below refers to the step number on the diagnostic table.
This test determines if the fuel tank pressure sensor is functioning.
DTC P0446 Step
Action
Values
Yes
No
1
Did you perform the Diagnostic System Check-Engine Controls?
--
Go to Step 2
Go to Powertrain On Board Diagnostic (OBD) System Check
2
Did DTC P0443, P0449, P0452, or P0453 set?
--
Go to Diagnostic Trouble Code (DTC) List/Type
Go to Step 3
3
Inspect the EVAP system for the following conditions:
A damaged EVAP vent valve
A pinched EVAP fresh air vent hose
Did you find and correct the condition?
--
Go to Step 15
Go to Step 4
4
With a scan tool, capture and record the fail record data and clear the DTCs.
Perform the Service Bay Test. Refer to Service Bay Test .
Does the scan tool indicate that the service bay test passed?
--
Go to Diagnostic Aids
Go to Step 5
5
Disconnect the purge line from the EVAP purge valve.
Turn ON the ignition, with the engine OFF.
With a scan tool, observe the FTP parameter.
Does the scan tool indicate FTP near the specified value?
0 in H2O
Go to Step 6
Go to Step 9
6
Important
Always zero the EVAP pressure and vacuum (in H2O) gages on the J 41413 EVAP Pressure and Purge Station before proceeding with diagnosis.
Turn OFF the ignition.
Reconnect all previously disconnected components.
Install the J 41415-40 Fuel Tank Cap Adapter.
Connect the J 41413 and the vehicle fuel fill cap to the J 41415-40 .
Turn ON the ignition, with the engine OFF.
With a scan tool, seal the EVAP system.
With the J 41413 , pressurize the EVAP system to the first specified value.
Rotate the J 41413 rotary switch to the OFF/HOLD position.
Command the EVAP canister vent valve OFF with a scan tool.
Does the scan tool indicate FTP near the second specified value?
5 in H2O
0 in H2O
Go to Diagnostic Aids
Go to Step 7
7
Disconnect the EVAP canister vent hose from the EVAP canister vent valve.
Does the scan tool indicate fuel tank pressure near the specified value?
0 in H2O
Go to Step 11
Go to Step 8
8
Disconnect the EVAP vent hose from the EVAP canister.
Does the scan tool indicate FTP near the specified value?
0 in H2O
Go to Step 14
Go to Step 12
9
With a scan tool, observe the FTP sensor voltage.
Is the FTP sensor voltage more than the specified value?
4.3 V
Go to DTC P0453 Fuel Tank Pressure Sensor Circuit High Voltage
Go to Step 10
10
Test for poor connections at the harness connector of the FTP sensor. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
--
Go to Step 15
Go to Step 13
11
Replace the EVAP canister vent valve. Refer to Evaporative Emission (EVAP) Vent Valve Replacement .
Did you complete the replacement?
--
Go to Step 15
--
12
Replace the EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement .
Did you complete the replacement?
--
Go to Step 15
--
13
Replace the FTP sensor. Refer to Fuel Tank Pressure Sensor Replacement .
Did you complete the replacement?
--
Go to Step 15
--
14
Repair for a blockage in the EVAP vent hose.
Did you complete the repair?
--
Go to Step 15
--
15
With a scan tool, capture and record the fail record data and clear the DTCs.
Perform the Service Bay Test. Refer to Service Bay Test .
Does the scan tool indicate that the service bay test passed?
5 in H2O
Go to Step 16
Go to Step 5
16
With a scan tool, observe the stored information, Capture Info.
Does the scan tool indicate any DTCs that you have not diagnosed?
--
Go to Diagnostic Trouble Code (DTC) List/Type
System OK
10-09-2010
I have problem code for evap pressure low. I put on new gas cap. Problem still there. Pulled fuel pump. O-ring might have not been sealing. Problem I think I might have is there are three lines going to fuel pump. I think they are 1. fuel delivery 2. fuel return 3. evap. Found that one line isn't hooked up to anything. It is about 14" long and shaped like a u. It has the quick release fittings on both ends. It was hooked up to one of the three connections on fuel pump. All three connections on top go toward drivers side of car. The line in question went out toward drivers side about 4 inchs, then 90 degree bend toward front of car for about 6", then 90 degree bend toward passenger side for about 4 ". I can find no other line unhooked. I went to GM and got a schematic. It does not show this line. I do not know if previous owner had this out and just put something there that does not belong. I have fuel leak only when filling tank full. Can not tell for sure if gas is coming out this hose or was coming out from possible o-ring problem on fuel pump. Any help would be appreciated.
10-09-2010
TurboTodd,
I'd suggest you start a new thread with your problem. You'll most likely receive more hits/suggestions. I took my fuel pump access cover off just last night and did see the three lines you mentioned above. I really wasn't concerned w/ the fuel pump though so I didn't really look around in detail, just blew all the dust off the pump.
I did see in another thread someone had a similar problem with a line that just ended to the air.
10-10-2010
Thanks, I will start new thread. I have never started a thread but will see if I can figure it out.
07-09-2023
is there an access panel in all grand prix in the trunk?? trying to find where my charcoal canister(vapor canister) is located? and really dont want to drop my fuel tank
07-15-2023
No, not all years had them. Pretty sure 97-04 has them.
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