Gas pump shuts off repeatedly when gassing car

I know this means I need to use an air compressor to blow out a valve, as it may be clogged. Or I need to test the EVAP Canister to see if it needs to be replaced. However, I cannot find the EVAP Canister for the life of me!!! I am not very familiar with cars. Please give me a detailed description of where I can locate the EVAP Canister? Thank you!

1 Answer

Vernon Taylor

GMC Master 7,446 Answers
Posted on Oct 07, 2017

Vernon Taylor

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It is nothing to do with the canister or associated pipework.

There would be no problem if the filler pipe entered the tank at the highest point but mostly they don't. Realistically the problem is like filling an old-fashioned teapot through the spout if the lid was sealed down tight and there was no vent - once the level has risen to a point equivalent to the top of where the spout enters the teapot a pressure begins to build under the top that resists further filling.

To overcome this problem in the fuel tank and to allow complete filling, the high points have a vent and each vent is joined together by a hose that is terminated at a vent in the filler pipe at a height above the tank top.

When fuel blowback happens during filling the cause is mostly one or more of those vents or hoses is blocked or squashed or otherwise damaged...

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if before you start if you hold the gas pedal just a bit does it start faster if it does its our idle air control valve that defective (iac) let me now pierre

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Jeffrey Turcotte

8991 Answers
Posted on Nov 20, 2010

SOURCE: Hi I have a 98 gmc sierra 1500 with 5.7 vortec,

It's hard to find these small leaks. If you have a vacuum pump, there are a few tests you can run on the components of the system. See below.

TESTING

Vapor Canister
See Figure 1

Apply a length of hose to the lower tube of the purge valve assembly and attempt to blow air through it. There should be little or no air should passing into the canister.

If the canister is equipped with a constant purge hole, a small amount of air will pass into the canister.

Using a hand-held vacuum pump, apply a vacuum of 15 in. Hg (51 kPa) to the control vacuum (upper) tube. If the vacuum does not hold for at least 20 seconds, the diaphragm is leaking. Replace the canister.
If the diaphragm holds vacuum, attempt to blow air through the hose connected to the PCV tube while vacuum is still being applied. An increase of air should be observed. If no increase is noted, the canister must be replaced.

Fig. Fig. 1: Cross-section of the vapor canister

Fuel Tank Pressure Control Valve

Attach a length of hose to the tank side of the valve assembly and try to blow air through it. Little or no air should pass into the canister.
Using a hand-held vacuum pump, apply vacuum equivalent to 15 in. Hg (51 kPa) to the control vacuum tube. If the diaphragm does not hold vacuum, the diaphragm is leaking. Replace the valve.
If the diaphragm holds vacuum, attempt to blow air through the hose connected to the valve while vacuum is still being applied. Air should pass. If no air is noted, the valve must be replaced.

Thermostatic Vacuum Switch

With engine temperature below 100°F (38°C), apply vacuum to the manifold side of the switch. The switch should hold vacuum.
Start and continue to run the engine until the engine temperature increases above 122°F (50°C). The vacuum should drop off.
Replace the switch if it fails either test.

purge valve location:

EVAP vacuum switch pic:

EVAP system diagram:

Anonymous

3400 Answers
Posted on Mar 17, 2011

SOURCE: '04 yukon denali. Gas pump shuts off at every

Sounds like vent tube or vapor canister is plugged. Try compressed air into vent tube. If that doesn't cure, vapor canister filter is plugged.

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