Fuel tank check valve?

[rdezs]

2014 Escalade. So of course my wife just filled up on gas 10 minutes before she got home and the fuel pump died. (Original with 175,000)

What a headache, gave up trying to get the fuel out. No fuel pump relay, it's controlled by the module. You can't siphon out of the fuel supply line through the existing pump. And if you remove the filler tube hose, there's something blocking it so you can't do that either. Anyone see one of these in their tank? It's like a built-in rollover valve. And when I tip the tank back, it's airtight.... No fuel sloshed out.

So for anyone interested, it wasn't that bad lowering the tank full of fuel, using an inexpensive harbor freight transmission jack with a piece of plywood protecting the underside of the tank. Once removed, and strap down to the jack, raise it up about 2 ft, remove the pump and siphon to 5 gallon jugs on the floor.

I recall over the past couple years postings about people having issues, taking 20 minutes to fuel the vehicle. Makes me wonder about this check valve or rollover valve that was never referenced? Kind of wondering if removing it would have some sort of negative consequence on the function of the entire fuel system.

No rust, but this is Oregon. That's not wet from fuel around it, I was starting to clean off the coating of dust and dirt.

 

[petethepug]

That trans jack paid for itself right there. Make sure you verify your evap charcoal canister isn’t losing its pellets and install a new one before the tank goes back in.

Another way the f/p goes bad is having the carbon pellets migrate into the fuel system. If that hasn’t happened, you got lucky & missed the short straw. Interesting that GM calls out a different part # for the base & ESV

 

[petethepug]

Quick question for ya if you’re still working on the truck. R/A lists a physical flex fuel sensor for the 14 Esky. Do you see one on the fuel lines under the truck.

I’m thinking it’s an error and R/A forgot that Esky were still Gen 3 in 14 but the pick ups had moved on to Gen 4 in 2014.

 

[rdezs]

I'll take a look this afternoon when I get home from work. Still have the fuel tank out, got a few parts coming like the filler tube and evap canister. The evap canister rattles with loose carbon inside, hopefully I caught it in time. Going to blow out the lines this afternoon and see.

My wife's Escalade is a bit of a Frankenstein. The bill date was issued November 2013, but didn't leave the factory until several months after they started building the 2015 model which began in the third week of January 2014. Still searching for the evap solenoid. The one I got from GM that comes with the hoses along the side of the fuel tank..... Doesn't match. It doesn't appear to even have one. Going to crawl under it this afternoon and double check up on the frame rail towards the engine. Like usual have to see where the 2015 model puts it, that's probably where I'll find it.

 

[rdezs]

LOL, this was going to be my weekend project, but she's commuting in my Hummer H2 right now... And I want it back

Leaves me driving the 86 CJ7 with a small block Chevy in it

 

[rdezs]

One side note on the carbon canister. It comes out easily before the fuel tank. Two 13 mm bolts and it comes out with the bracket it's mounted to. Of course the typical pita dealing with those quick disconnects that are anything but quick.

And you're right Pete, that transmission jack paid for itself yet again. I use it on the front differentials as well as transmissions. It's paid for itself probably seven or eight times in the past 2 years. LOL, I think my neighbors borrowed it twice as well. Picked it up for under a $100 bill.

 

[rdezs]

Quick question for ya if you’re still working on the truck. R/A lists a physical flex fuel sensor for the 14 Esky. Do you see one on the fuel lines under the truck.
View attachment 457761

I’m thinking it’s an error and R/A forgot that Esky were still Gen 3 in 14 but the pick ups had moved on to Gen 4 in 2014.

I followed the fuel lines all the way up to the engine, no such sensor.

 

[rdezs]

... And I can confirm that is a one-way check valve, or rollover valve just inside the tank where the filler hose connects.

You can blow into the tank through that opening very lightly and the air flows.... And then the valve shuts again. I can definitely see this is a problem when it gets stuck.... It would take forever to get fuel in the tank. Does not appear to be serviceable without replacing a fuel tank.

 

[LegalBrief]

Why not go to junk yard and just get a newish tank? Or a new tank?

 

[rdezs]

Well mine is still working okay. But when or if that valve malfunctions, the last time I looked it was around $700 for a new tank.

 

[Fless]

I don't think the emissions rules would allow that valve to function like that during a fill. That would put fuel vapors directly into the atmosphere and the canister and vent valve are supposed to scrub those vapors. It may just be a safety valve in case the tank pressure is too high, likely due to a restricted or malfunctioning vent canister and/or vent valve.

 

[rdezs]

You can blow very lightly into the tank and air flows freely, but you can actually hear it close when you stop blowing. So I'm guessing as long as there's fuel flowing through it there's no vapors that can come up.

 

[petethepug]

There’s an entire thread on that valve. It’s non serviceable on gen 3 trucks. You are correct.