2005 Suburban *Extremely* Slow Fueling

[Aboonah]

We have a 2005 Z71 Suburban for two years. From the time we got it, it has been very slow to refuel: 1/10 gal in 3-seconds is about the fastest it will take fuel without the nozzle shutting off.

I finally got tired of standing there in 100-degree heat of summer and current 0-degree cold - and took it to a local shop.

They removed the roll-over valve, saying it was defective. Maybe it was, but removing it did not make any improvement in the problem.

I took it to AutoZone to read the codes and got four codes back: PO455 (Large Evap Leak Detected), PO430 (Catalyst Efficiency Low-bank 2), PO420 (Catalyst Efficiency Low-bank 1) and PO140 (Heated Oxygen Sensor)

Can anyone put this together?

TIA

[aleekat]

Quick google search pretty common.
http://www.subaruforester.org/vbulle...continue-2152/

Scroll down to Peaty's post, PDF file. I would read the entire thread.

[j cAT]

Originally Posted by Aboonah

We have a 2005 Z71 Suburban for two years. From the time we got it, it has been very slow to refuel: 1/10 gal in 3-seconds is about the fastest it will take fuel without the nozzle shutting off.

I finally got tired of standing there in 100-degree heat of summer and current 0-degree cold - and took it to a local shop.

They removed the roll-over valve, saying it was defective. Maybe it was, but removing it did not make any improvement in the problem.

I took it to AutoZone to read the codes and got four codes back: PO455 (Large Evap Leak Detected), PO430 (Catalyst Efficiency Low-bank 2), PO420 (Catalyst Efficiency Low-bank 1) and PO140 (Heated Oxygen Sensor)

Can anyone put this together?

TIA

you do have a lot of problems with this vehicle. p0455 is the pressure sender is not working. this is in the fuel tank. the p0420/430 is saying that the cat converters both are not working properly [could be bad] the p0140 is the driver side downstream O2 sensor not properly switching voltage. when the engine is running the sensor voltage swings up and down at a rate that the PCM is expecting due to the programing of the computer , so this is not being generated as expected. The fuel fill is because the vent valve is stuck closed or the charcoal canister and venting lines are plugged up from over filling the fuel tank.

there is no roll over valve that I know of . I hope they did not screw you over with this part.

the fuel tank is a sealed unit if you roll it the fuel stays in the tank.

if there is such a valve I would be very interested also the part number .

[Aboonah]

jCat - are you sure about the PO455? Everything I've seen says it comes up as "EVAP large leak detected" and the 1st listed cause is loose fuel cap.

When I picked up the suburban they gave me a gas receipt for $10 of gas that one of their guys put in it to test the flow. When I went to fill it and test it myself, I found the cap loose! I assumed that was what threw the PO455 code, because it fit the description.

[j cAT]

Originally Posted by Aboonah

jCat - are you sure about the PO455? Everything I've seen says it comes up as "EVAP large leak detected" and the 1st listed cause is loose fuel cap.

When I picked up the suburban they gave me a gas receipt for $10 of gas that one of their guys put in it to test the flow. When I went to fill it and test it myself, I found the cap loose! I assumed that was what threw the PO455 code, because it fit the description.

I would disconnect the negative battery connection and place the key to run. after 10 minutes remove key and reconnect the battery. drive around for a day then have the store recheck codes.

the fuel evap system is with a in tank pressure transducer. these devices fail . also the wiring/connector to them corrode. this will not effect your filling up the tank.

the PCM is programed to apply vacuum and pressure to the fuel tank. then the pressure transducer reports what the tank pressure / vac is . if it is incorrect you will get many other as they call "GAS CAP CODES". your p0455 is specific to the pressure transducer not working correctly .

I would first repair the other engine management issues . then repair the fuel fill issue which is the venting/canister being plugged up or even a crushed vent line etc...

possible the fuel filler hose[s] are kinked. this is a small hose in the large hose. gas flows thru the small hose air vents out the big hose. this is not all that common.

[j cAT]

Originally Posted by Aboonah

jCat - are you sure about the PO455? Everything I've seen says it comes up as "EVAP large leak detected" and the 1st listed cause is loose fuel cap.

When I picked up the suburban they gave me a gas receipt for $10 of gas that one of their guys put in it to test the flow. When I went to fill it and test it myself, I found the cap loose! I assumed that was what threw the PO455 code, because it fit the description.

HERE IS A gm TSB




this is a bulletin i found for you ,,,,enjoy !

#02-06-04-037J: Check Engine Light On, Fuel
Tank Hard to Fill, DTCs P0442, P0446, P0455 or P0449 Set (Replace Evaporative
Emission (EVAP) Vent Valve Sloenoid Assembly and Add/Relocate Filter Box Using
Service Kit) - (Mar 20, 2012)







Subject:
Check Engine Light On, Fuel Tank Hard to Fill,
DTCs P0442, P0446, P0455 or P0449 Set (Replace Evaporative Emission (EVAP) Vent
Valve Solenoid Assembly and Add/Relocate Filter Box Using Service Kit)




Models:
1999-2007 Chevrolet Silverado (Classic) Models

1999-2007 GMC Sierra (Classic) Models

2007-2010 Chevrolet Silverado Models (Including
Hybrid)

2007-2010 GMC Sierra Models (Including
Hybrid)


This bulletin is being revised to update the Parts Information.
Please discard Corporate Bulletin Number 02-06-04-037I (Section 06 –
Engine/Propulsion System).




Condition

Some customers may comment about the check engine light being illuminated.
They may also comment that their vehicle is difficult to fill with fuel or when
filling, the pump continuously shuts off before the tank is full.

When checking the vehicle for DTCs, the ECM may report one or more of the
following DTCs set as current or in history: P0442, P0446, P0449 or P0455.


Cause

The EVAP canister vent solenoid (CVS) valve draws fresh air into the system
through a vent.

Under certain operating conditions, dirt and dust intrusion into the EVAP CVS
fresh air intake/venting system, may result in restricted air flow.

Under certain operating conditions, water, if ingested into the EVAP CVS
fresh air intake/venting system, may reach the CVS valve causing corrosion in
the CVS valve, and may cause restrictions in the fresh air intake path, when the
valve is in the closed position.


Correction (1999-2007 Classic/Old Style
Models)

After following the published SI diagnostics and determining that the EVAP
canister vent valve is the cause of the MIL light, replace the existing EVAP
canister vent valve assembly with a new assembly. This new assembly is a sealed
unit that is designed to be vented through a remote filter box. To ensure
correct installation, follow the procedures below.


Important: DO NOT replace the EVAP canister assembly for this concern
unless it fails the leak test.

1999-2003 Model Year (Use Service
Kit P/N 19207762)



Important: The new canister vent valve will be installed in a new
location, outside of the frame.

1. Raise the vehicle. Suitably support the vehicle.
2. Disconnect the EVAP canister vent valve electrical
   connector, if equipped.
3. Disengage the two vent valve pipe clips securing the pipe to
   the underbody. Remove the clips from the underbody and discard.
4. Disconnect the vent valve pipe at the EVAP canister.
5. Remove and retain the EVAP canister vent valve bracket
   mounting bolt.
6. Remove the complete EVAP canister vent valve assembly with
   bracket attached and discard.
7. Position and secure the new valve assembly to the frame
   bracket on the outside of the frame using the existing hole and mounting
   bolt.
   Tighten
   Tighten the bracket mounting bolt to 12 Y (106 lb in).
8. Connect the vent valve pipe to the EVAP canister.
9. Install the two vent valve pipe clips into the existing
   underbody holes.
10. Connect the EVAP canister vent valve electrical connector, if equipped.
11. Attach bulk 5/8” heater hose to the vent valve port and secure using a
    clamp. Run a length as needed along the frame rail routing to the area above the
    transmission.
12. Cut the hose to determined length and install the supplied filter box.
    Secure using a clamp.
13. Remove the transmission support and lower the transmission assembly as
    necessary to allow for access to the new filter box location.
14. Secure the filter box to the transmission vent hose just forward of the hose
    tee-section using a tie strap. DO NOT pinch or restrict the transmission vent
    hose. The filter box opening should be pointing downward.
15. Raise the transmission and reinstall the transmission support.
16. Tie strap the hose as needed along the frame rail in order to keep the hose
    away from pinch-points and heat sources.
17. Lower the vehicle.

2004-2007 Model Year (Use Service Kit
P/N 19207763)



Crew Cab Short Box Shown Below, Other
Configurations Similar





Extended Cab Short Box Shown Below,
Other Configurations Similar

1. Raise the vehicle. Suitably support the vehicle.
2. Disconnect the EVAP canister vent valve electrical
   connector.
3. Disconnect the canister pipe from the vent valve.
4. Push in the retainer and remove the existing canister vent
   valve from the fuel tank clip or mounting bracket. Discard the old valve.
5. Cut back the existing canister pipe approximately 51 mm
   (2 in) to remove the quick connect end.
6. Install the new canister vent valve solenoid to the fuel
   tank clip or mounting bracket as shown above. The valve port closest to the
   electrical connector must point towards the canister.
7. Cut bulk 5/8” heater hose to a length of approximately 76 mm
   (3 in). Install the hose between the solenoid and the canister pipe and secure
   using clamps.
8. Attach bulk 5/8” heater hose to the vent port and secure
   using a clamp. Run a length as needed along the frame rail routing to the area
   above the transmission.
9. Cut the hose to determined length and install the supplied
   filter box. Secure using a clamp.
10. Remove the transmission support and lower the transmission assembly as
    necessary to allow for access to the new filter box location.
11. Secure the filter box to the transmission vent hose just forward of the hose
    tee-section using a tie strap. DO NOT pinch or restrict the transmission vent
    hose. The filter box opening should be pointing downward.
12. Raise the transmission and reinstall the transmission support.
13. Connect the EVAP canister vent valve electrical connector.
14. Tie strap the hose as needed along the frame rail in order to keep the hose
    away from pinch-points and heat sources.
15. Lower the vehicle.

Correction (2007-2010 New Style
Models)

After following the published SI diagnostics and determining that the EVAP
canister vent valve is the cause of the MIL light, replace the EVAP canister
vent valve assembly and relocate the remote filter box. To ensure correct
installation, follow the procedures below.


Important: DO NOT replace the EVAP canister assembly for this concern
unless it fails the leak test.

Use Service Kit P/N 19207763



2500 Crew Cab Short Box Shown Below,
Other Configurations Similar





1500 Extended Cab Short Box Shown
Below, Other Configurations Similar

1. Raise the vehicle. Suitably support the vehicle.
2. Disconnect the EVAP canister vent valve electrical
   connector.
3. Disconnect the vent valve pipe quick connect from the
   canister.
4. Either cut the existing valve vent pipe and leave the
   remaining section of pipe in the vehicle or remove along with the valve.
5. Push in the retainer and remove the existing canister vent
   valve from the fuel tank clip or mounting bracket.
6. Cut back the existing canister pipe approximately 51 mm
   (2 in) and retain the pipe for use with new valve.
7. Connect the canister pipe quick connect to the
   canister.
8. Install the new canister vent valve solenoid to the fuel
   tank clip or mounting bracket as shown above. The valve port closest to the
   electrical connector must point towards the canister.
9. Cut bulk 5/8” heater hose to a length of approximately 76 mm
   (3 in). Install the hose between the solenoid and the canister pipe and secure
   using clamps.
10. Attach bulk 5/8” heater hose to the vent port and secure using a clamp. Run
    a length as needed along the frame rail routing to the passenger side area above
    the transmission.
11. Cut the hose to determined length and install the supplied filter box.
    Secure using a clamp.
12. Remove the transmission heat shield, if necessary.
13. Remove the transmission support and lower the transmission assembly as
    necessary to allow for access to the new filter box location.
14. Secure the filter box to the transmission vent hose just forward of the hose
    tee-section using a tie strap. DO NOT pinch or restrict the transmission vent
    hose. The filter box opening should be pointing downward.
15. Raise the transmission and reinstall the transmission support.
16. Reinstall the transmission heat shield.
17. Connect the EVAP canister vent valve electrical connector.
18. Tie strap the hose as needed along the frame rail in order to keep the hose
    away from pinch-points and heat sources.
19. Lower the vehicle.

Parts Information









Part Number


Description


Qty




19207762 (1999-2003 Model Year)


Solenoid Kit, EVAP Emission Canister Vent Valve


1



19207763 (2004-2010 Model Year)


Solenoid Kit, EVAP Emission Canister Vent Valve


1



9438383 (5/8” X 25' roll)


Hose


Cut to Length



12337820


Tie-Strap


5



11609970


Clamp


2 (1999-2003)

or

4 (2004-2008)


Warranty Information

For vehicles repaired under warranty, use:









Labor Operation


Description


Labor Time




J7908*


Replace Evaporative Emission (EVAP) Vent Valve Solenoid Assembly and
Add/Relocate Filter Box Using Service Kit


1.1 hrs**



* This is a unique labor operation for bulletin use only. It will not be
published in the Labor Time Guide.

**Diagnosis time is included in this labor time.