Fueling Issues - What I’ve Done

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Dooba

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I’ve lurked in this forum a couple of times and it has been extremely helpful. I ended up fixing the issue on my 5.3 LM7 (non-flexfuel or “T” on the vin) Yukon with the following ACDelco parts:

Vent Valve Solenoid #214-2149

Purge Valve #214-1105

Charcoal Canister #215-464

Read the next post for more details.

Note: If you own a flex fuel ready engine, I know that the vent valve solenoid will be different, but I presume the rest of the parts are interchangeable. If you’re looking for that specific vent solenoid, it should be part #214-1091.
 
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Dooba

Dooba

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This issue started 6 months after my family purchased a 16 Yukon new, but didnt realize it until recently since it is a hand me down from my dad. Its a 2004 5.3 GMC Yukon SLT with 120k miles. Anyways, I popped in a cheap ECU reader and it gave me a P0449 code for the evap system. This was a stored code and I did not have a check engine light, people said it’ll recheck under really specific conditions so that’d explain why. I ended up researching on youtube, here and other forums to come up with a solution. I was able to achieve that with the parts above and by cleaning the pipes between all three parts with compressed air (I went to a friend’s shop to do this, since I didn’t find anything that told me what to disconnect to not have pellets go into the tank).

What you’ll need is:
A spanner with 8 mm and 13 mm extensions to remove the bolts for the purge valve and charcoal canister respectively.
A flathead screw driver to wedge between pipe fittings to get them to come loose.

I didnt need a 2/4 point lift to swap out the parts but it doesnt hurt to have more space. I use jack stands to give me a bit more leeway.

Vent Solenoid:
I followed this video:
All you need here is a flathead screwdriver.

I didn’t bother with the relocation kit since this is an inexpensive part and this is my first time ever working on a car and it looked complicated (my dad put up the jack stands for me, just saying)

After I replaced this part, which most people said would be the culprit, I still had fueling issues so I did the purge valve next. However, I’m sure this was an issue since the filter disintegrated in my hand and it was full of dust.

Purge Valve:
I followed this video:
You’ll need a spanner and an 8mm extension here.

This didnt end up fixing it, so I did the charcoal canister next. The part itself seemed fine, but it was an inexpensive part anyways.

Charcoal Canister:
I partially followed this video:
You’ll need a flathead screwdriver, spanner and a 13mm extension here.

After replacing this, the car ended up filling up normally, which was great. Although, a lot of forum members here and elsewhere mentioned dropping the tank and cleaning the lines to make sure it stays that way and not to overfill. Noted on the latter, not a clue what to do on the first one so I took it to my friend’s shop and he had to drop the tank which I’d be too anxious to do. I also asked him to check the ECU to see if the fuel tank pressure sensor (part #16238399) was bad, but it was working as expected. If you still have issues after that I’d look into the sensor since it could stop vents fom engaging.

I hope this helps!
 

05YukonXL

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Thanks for sharing your experience. I'm having this issue with my 200k mile yukon xl. The issue started out of the blue, went from going 10-15 gallons without the nozzle lever popping, to barely getting 1 gallon in at a time. On a recent road trip I stopped at a gas station with really low pressure and I got about 9 gallons at a time...

So I replaced theVent Valve Solenoid #214-2149 - its filter was mush, but it didn't do much to help the issue. Next up is the charcoal canister and blowing the lines. We'll see if / how much that helps before dropping the tank - which I'll probably let me mechanic do.
 
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05YukonXL

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Replaced the charcoal canister and vacuumed the lines. Problem solved. Incidentally, when I detached the hoses I was showered by charcoal pellets.
 
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Dooba

Dooba

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5 month update -
I’ve been filling up regularly, using it on a daily basis with no fueling hiccups.

There’s always something though, my blend door actuators are on their way out, second gear is slipping, my heater core started leaking and need to replace my engine mounts (I think, strong vibration in cabin). Car’s at 122k miles.

Edit: Oh, and my front wheel bearings are starting to go out.

Sorry for bumping an old thread, haha.
 

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