another slow fillling gas tank thread - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 06-24-2013, 08:17 PM
tomas216's Avatar
tomas216 tomas216 is offline
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2003 GMC Envoy SLT
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another slow fillling gas tank thread

my 2003 envoy takes at least 15 minutes to fill at the gas pumps. there are no codes showing. ive taken the fill hose off the tank and felt the backcheck valve inside the tank. its free moving and working properly. i checked the fill hose for blockage, nothing there. i also took off my vapor canister purge solenoid (the one mounted at the rear of the gas tank) took it over to my workbench and blew air into it. no resistance, so it should be venting properly, unless the valve is closing when i plug it back in?
anybody have some more tricks i could try. thanks!
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  #2  
Old 06-25-2013, 10:27 AM
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wcosh wcosh is online now
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2003 Chevy TrailBlazer LT EXT
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On my 2003 TB I can fill up easily if I rotate the nozzle counter clockwise to about 4 o'clock.
I i just put the nozzle in at 6 o'clock it will keep shutting off

maybe same issue?
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  #3  
Old 06-25-2013, 12:33 PM
nfsroadsta2786 nfsroadsta2786 is offline
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2003 Chevy TrailBlazer LS
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you sure its not the gas station?
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  #4  
Old 06-25-2013, 02:35 PM
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tomas216 tomas216 is offline
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2003 GMC Envoy SLT
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its definitely something wrong with my car. this just started last week. ive used the same pump for the last 7 years and never had any trouble. now it keeps clicking off. ive tried different gas stations in town and they all keep clicking off.
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  #5  
Old 06-25-2013, 04:11 PM
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Sir Golitech Sir Golitech is offline
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2007 Chevy TrailBlazer
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Quote:
Originally Posted by tomas216 View Post
i also took off my vapor canister purge solenoid (the one mounted at the rear of the gas tank) took it over to my workbench and blew air into it. no resistance, so it should be venting properly, unless the valve is closing when i plug it back in?
anybody have some more tricks i could try. thanks!
That is possible.

The vent solenoid is normally open. That means that when the truck is off and/or there is no power to the solenoid, the vent is open allowing atmospheric pressure into the fuel/EVAP system and also allowing the tank/system to vent vapors when filling up.

There is also a TSB...

2002 GMC Truck Envoy - 4WD | Bravada, Envoy, TrailBlazer (VIN S/T) Service Manual | View All Bulletins | Document ID: 1544575
--------------------------------------------------------------------------------

#04-06-04-003A: Vehicle is Difficult to Fill with Fuel or Filling Station Pump Shuts Off Before Tank is Full or Fuel Spits Back/Out When Filling Tank (Replace Fuel Tank Filler Upper Pipe and Lower Hose) - (Aug 11, 2004)


Subject: Vehicle is Difficult to Fill with Fuel or Filling Station Pump Shuts Off Before Tank is Full or Fuel Spits Back/Out When Filling Tank (Replace Fuel Tank Filler Upper Pipe and Lower Hose)


Models: 2003 Chevrolet TrailBlazer with 83 L (22 Gallon) Fuel Tank (RPO NNK)

2003 GMC Envoy with 83 L (22 Gallon) Fuel Tank (RPO NNK)

2003 Oldsmobile Bravada with 83 L (22 Gallon) Fuel Tank (RPO NNK)

2002-2003 Chevrolet TrailBlazer EXT

2002-2003 GMC Envoy XL

2004 Buick Rainier

2004 Chevrolet TrailBlazer, TrailBlazer EXT

2004 GMC Envoy, Envoy XL, Envoy XUV

2004 Oldsmobile Bravada

Built Prior to December 2003




--------------------------------------------------------------------------------

This bulletin is being revised to provide new part number for 2002-2003 vehicles. Please discard Corporate Bulletin Number 04-06-04-003 (Section 06 -- Engine/Propulsion System).


--------------------------------------------------------------------------------

This bulletin provides information on two different conditions.

Condition 1
Some customers may comment that their vehicle is difficult to fill with fuel or when filling, the pump continuously shuts off before the tank is full.

Cause
This condition may be caused by the variability (fuel flow rates, type of fuel fill nozzle, fuel properties) at the filling stations. There is a potential to develop an increase in back pressures internal to the fuel fill neck. This back pressure trips the fuel nozzle prior to filling the tank, or results in a hard to fill condition.

Condition 2
Some customers may comment that when filling the fuel tank, a small amount of fuel may spit back/out.

Cause
This condition may be caused by the equalization of pressure between the fuel tank and the fuel fill neck that does not react quickly to the variance in the pressure when the fueling station fuel nozzle trips off.

Correction
Replace the fuel tank filler upper pipe assembly with P/N 88983256 or P/N 15131043, and lower hose assembly with P/N 15131046. The new upper pipe has been redesigned to provide smoother flow conditions within the section and the lower hose has been redesigned to include a checking feature. Use the procedure listed below.

Remove the fuel fill cap.
Remove the fuel fill pipe housing.



Remove the fuel fill pipe bracket nut (2).
Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in the General Information sub-section of the Service Manual (SI Document ID #744862).
Remove the fuel fill pipe ground strap bolt.
Cut off the ground strap ring terminal and tie strap.



Loosen the fuel hose clamp (8).
Remove the fuel fill upper pipe (7) from the vehicle.
Install the new fuel fill upper pipe into the vehicle. Use P/N 88983256 for 2002-2003 model year vehicles or P/N 15131043 for 2004 model year vehicles.
Tighten the fuel hose clamp.
Tighten
Tighten the clamp to 2.5 Nm (22 lb in).

Wrap the excess length of ground strap around the fuel hose as necessary.
Install the fuel fill pipe ground strap bolt in its original location.
Loosen the fuel hose clamps (1,3).
Remove the lower fuel hose (2) from the vehicle.
Install the new lower fuel hose into the vehicle.
Tighten the lower fuel hose clamps.
Tighten
Tighten the clamps to 2.5 Nm (22 lb in).

Lower the vehicle.
Install the fuel fill pipe bracket nut.
Tighten
Tighten the nut to 10 Nm (89 lb in).

Install the fuel fill pipe housing.
Install the fuel fill cap.
Parts Information
Part Number
Description
Qty

88983256
Pipe Asm - F/Tank Fill (2002-2003 vehicles)
1

15131043
Pipe Asm - F/Tank Fill (2004 vehicles)
1

15131046
Hose - F/Tank Fill
1


Parts are expected to be available from GMSPO on August 13, 2004.
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  #6  
Old 06-28-2013, 08:21 PM
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tomas216 tomas216 is offline
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2003 GMC Envoy SLT
Sandalwood Metallic 4.2L I6 4X4
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Posts: 70
-----solved-----

turns out i had a bar code sticker stuck half way down the fill hose which was restricting it enough to cause the gas pump to keep clicking off. i wouldnt have found it, but i took the whole hose off and held it up to the light. im thinking it came from my new funnel i used to dump some gas in a couple weeks ago. problem solved. thanks for the suggestions guys.
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