Help! - '05 Yukon Gas Leak

[TMXX1]

I noticed a gas smell a few days ago and thought nothing of it. But today, it's much more. Major gas leak.

Laying under the car, I can see it coming down the side of the tank, exactly in-line where the driver door and the back door meet. I can't tell if it starts from the side of the tank, or the top. Not sure where makes more sense.

How do I go about figuring out what this is, and how do I fix it?

Thank you so much guys.

 

[Chip18]

That sounds like a "don't be driving" until this issue is solved!! First step would be a fuel pressure tester and a "Fire Extinguisher" since you have a know leak.

You can rent a fuel pressure tester from an autostore, I don't know what the fuel pressure should be on these guys?? But someone here does. And you can add this if you can't find the leak with that tool alone.

https://www.amazon.com/Mastercool-53351-B-Professional-Detector-Light/dp/B000IHJXHG

 

[nharkey85]

My guess would be a bad line or connection on top of the tank. If it were the tank itself it should only leak when fuel level is above the source hole/crack/etc

 

[TMXX1]

Thanks Chip

On the last drive I took with it (while leaking), it leaked the most at 2 points, during turns, and when I put the car in park. On the staightaways, next to nothing (I looked at my road and inspected), does this point to anything specific?

 

[TMXX1]

My guess would be a bad line or connection on top of the tank. If it were the tank itself it should only leak when fuel level is above the source hole/crack/etc

How do I go about figuring this out?

 

[nharkey85]

How do I go about figuring this out?

Honestly you'll probably need to drop the tank

 

[TMXX1]

Just did some exploring under the truck...right where that support that holds up the tank goes (right in line with where the doors meet), on the top of the tank there feels like a indent there, it feels like a baseball size, and it's full of gas. It's definitely an indent that it meant to be there, but the gas is not.

...Am I really dropping the tank next? Gonna be a crappy night...

 

[nharkey85]

I've never had to deal with anything back there, but I'm assuming there's not enough room to do any real work without dropping it

 

[TMXX1]

It actually looks like it's in the front of the tank...towards the front of the car. Does this help?

I'm trying to find a diagram of the tank or something, but no luck yet

 

[Chip18]

Certainly don't fill it full of fuel if there is the possibility of needing to drop it. A trip to a pick and pick to see what's involved with getting it ot could prove useful.

And I was looking for something else and came across this thread.:

http://z71tahoe-suburban.com/iboard/lofiversion/index.php?t38023.html

Honestly you'll probably need to drop the tank

Yeah ... more than likely??

 

[Rocket Man]

I've seen at least one thread here regarding corroded fittings at the fuel lines on the top of the tank. You can do a search here for others that have had the problem or just go ahead and drop the tank since there's probably nothing you can do to fix it unless you do.

Edit: that link shows the same as what I saw here on this forum. No need to go search! So yeah, those fittings.

 

[Chip18]

Just did some exploring under the truck...right where that support that holds up the tank goes (right in line with where the doors meet), on the top of the tank there feels like a indent there, it feels like a baseball size, and it's full of gas. It's definitely an indent that it meant to be there, but the gas is not.

...Am I really dropping the tank next? Gonna be a crappy night...

Wait ... what ... fuel??? I was looking at the pictures of the link I posted and that was a horror show!!

It looks like because of the design of the fuel tank ... water/snow and crap could get trapped up there?? if it did the fuel lines could be easily damaged ie rust?? Guess it does not happen enough for GM to change the design??

So it seems that more than likely ... your gonna need to drop the tank ... hope it's not full of fuel???

 

[Chip18]

I've seen at least one thread here regarding corroded fittings at the fuel lines on the top of the tank. You can do a search here for others that have had the problem or just go ahead and drop the tank since there's probably nothing you can do to fix it unless you do.

Edit: that link shows the same as what I saw here on this forum. No need to go search! So yeah, those fittings.

LOL ... you've been here longer, these beast are new to lots of us.

 

[HiHoeSilver]

LOL ... you've been here longer, these beast are new to lots of us.

What happened with this?

 

[Rocket Man]

What happened with this?

The op disappeared 10/4/16. Hope he's ok!

 

[Jarrett McClune]

Sounds like what I had, ended up the whole sending unit was rotted out. Just bought a new pump and sending unit to be safe.

 

[Jarrett McClune]

Also there is absolutely no way to dont wi Bout dropping tank, you can drop it a little bit to see what's wrong, but if it is rotted out, I wouldn't drop it until you are where it needs to be, last thing you need is to try dropping it and break any rotted lines. Been there.