Question about 2003 Chevrolet Avalanche

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High pressure in avalanche fuel tank

Pressure releases when gas tank cap removed

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

vetteman3002
  • 2299 Answers

SOURCE: 2005 avalanche, check eng light

The gas cap must click three times. This is not a sensor problem, more than likely. More than likely something is stuck in the vent line to the charcoal filter. The charcoal filter could be plugged up. This filter is located next to the fuel fill hose. The hose that runs from the fuel fill to the tank. The charcoal filter is a little black box with hoses going in the top. Sometimes you can hit the box and the debris will pass.

Posted on Oct 21, 2010

  • 844 Answers

SOURCE: 2004 chevy blazer. can,t pump

your tank is not venting properly. check along fuel line from tank to motor for a pressure relief valve to canister

Posted on Apr 04, 2011

reyals_666
  • 95 Answers

SOURCE: i have a 2007 chevy tahoe with lots of pressure when i take gas cap off?

this is rather normal after the car has been warmed up.

Posted on Oct 10, 2012

SOURCE: pressure release from gas tank when removing cap

You have a check light on & pressure when you
remove the gas cap,so the question to you is,
why are you not getting the codes & repairing the
Evap System

Pretty simple I would say !!

Posted on Oct 27, 2012

SOURCE: Service engine light keeps coming on after

There is nothing new there other than your
apparently not checking for codes to diagnose
the Evap System

Posted on Aug 22, 2013

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1 Answer

Pressure release from gas tank when removing cap


You have a check light on & pressure when you
remove the gas cap,so the question to you is,
why are you not getting the codes & repairing the
Evap System

Pretty simple I would say !!

Oct 26, 2012 | 2002 Chevrolet Suburban

1 Answer

After traveling, there was high air pressure in the fuel tank? is it normal?


Are you sure is was high air pressure and not vacuum? Most modern automobiles have fuel tank purge systems which will place the fuel tank under low pressure (or vacuum). If you remove the fuel cap immediately after travelling a long distance or while the engine is still running, it could be normal to hear a "hissing" sound when removing the cap as the pressure in the tank will equalize when the cap is removed.

Apr 06, 2012 | Toyota RAV4 Cars & Trucks

1 Answer

Steps replacing a 1985 grand marquis fuel pump for first time alone thanks


See Figure 1
Two different electric fuel pump configurations were used on fuel injected models. One consists of a low pressure in-tank boost pump in conjunction with an external, frame-mounted high pressure pump. The low pressure pump is used to provide pressurized fuel to the inlet of the high pressure pump and helps prevent noise and heating problems. System pressure is controlled by a pressure regulator mounted on the engine.
The other configuration consists of an in-tank high pressure pump which does not utilize a boost pump.


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Fig. Fig. 1: Disassembled electric fuel pump


REMOVAL & INSTALLATION

In-Tank Pump
See Figures 2, 3 and 4

  1. Disconnect the negative battery cable.
  2. Depressurize the system and drain as much gas from the tank by pumping out through the filler neck.
  3. Raise and support the rear end on jackstands.
  4. Disconnect the fuel supply, return and vent lines at the right and left side of the frame.
  5. Disconnect the wiring to the fuel pump.



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Fig. Fig. 2: Low pressure in-tank electric fuel pump


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Fig. Fig. 3: High pressure in-tank fuel pump


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Fig. Fig. 4: Removal of electric fuel pump

  1. Support the gas tank, loosen and remove the mounting straps. Remove the gas tank.
  2. Disconnect the lines and harness at the pump flange.
  3. Clean the outside of the mounting flange and retaining ring. Turn the fuel pump lock ring counterclockwise and remove.
  4. Remove the fuel pump.

To install:
  1. Clean the mounting surfaces. Put a light coat of grease on the mounting surfaces and on the new sealing ring. Install the new fuel pump.
  2. Installation is in the reverse order of removal. Start the vehicle and check electric fuel pump operation. Check for fuel leaks.

High Pressure External Pump
See Figure 5
  1. Disconnect the negative battery cable.
  2. Depressurize the fuel system.
  3. Raise and support the rear of the vehicle on jackstands.
  4. Disconnect the inlet and outlet fuel lines.
  5. Detach the electrical harness connection.
  6. Bend down the retaining tab and remove the pump from the mounting bracket ring.
  7. Install in reverse order. Make sure the pump is indexed correctly in the mounting bracket insulator. Start the vehicle and check electric fuel pump operation. Check for fuel leaks.



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Fig. Fig. 5: High pressure external fuel pump

Feb 12, 2011 | 1985 Mercury Grand Marquis

1 Answer

Chugging going uphill and smell of gas near the tank


hi no dtc showing if not see if there are any leaks on the fuel tank and pipes especially at the rear then pressure test the fuel system make a note then jack the front up as high as then do a pressure test again see if there is any difference it might be worth your while changing your fuel filter if theres no signs of leaks and pressure test is ok check evap system for sticking valves or pipes off or trapped yates210456

Sep 28, 2008 | 2000 Ford Expedition

1 Answer

Locating the fuel filter


You didn't state the year or engine size,,,, On the firewall,( passenger side, back of engine compartment, it's round) on fuel injected models, relieve pressure of fuel line before beginning- gas cap off,also must release pressure on fuel injected models- some have pressure release on top of filter, others on fuel rail,this will be a bolt on top of a bolt. Hold the bottom bolt (w/ open end wrench, loosen top bolt w/ 6mm wrench. Cover with rag, so you don't have gas shooting up in your face. Carb models: have 2 filters, one inline in engine compartment, 2nd under car attached to fuel tank. Open gas cap to relieve pressure before starting removal on carb models. countrycurt0

Jul 30, 2008 | 1992 Honda Accord

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