Got the dreaded slow tank fill

09_4WD_YUKON · Mar 1, 2021

This is some BS!!! Got the slow tank fill, pump cuts off after .5 gallon or so. Ok, so I change everything, canister, valve and solenoid. Blew the line out....same crap! Take to a shop right down the road and they pull all of the lines and clean them out....they were full of the pellets. Shop says if that doesn't work, most likely will have to change the tank as there is a non-servicable "check valve" that cannot be reached to clean that is probably clogged too. Well, none of that has worked, so now what? Does the tank really need to be changed?

NOSOK · Mar 1, 2021

I didn't realize that's a known issue. Might be happening with our Suburban. 1st time it shut off every ~5 gal was when it was in the negatives so I chalked it up to the cold. Then last week I got gas and didn't realize until I had driven away the pump had clicked off after only half a tank or so.

It's pretty crappy if you have to replace the fuel tank to fix this. If you're going with that shop I hope you trust them because that's something they could easily recommend to get a sale.

gooffeyguy · Mar 1, 2021

Do you go to different stations or always the same one? If same one, it could be just the stations pumps.

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kbuskill · Mar 1, 2021

When we did mine we disconnected the lines from the canister and pressurized the tank by wrapping a rag around the blow gun and sticking it into the filler neck where the fuel cap goes.

The rag helps seal the air in the tank. Just be careful not to over inflate the tank as it is plastic and you can actually watch it expand as you do this.

It blew out a lot of pellets from the lines. We also disconnected the purge valve up by the intake manifold and blew air back towards the canister.

I would certainly give that a try before condemning the tank.

09_4WD_YUKON · Mar 2, 2021

gooffeyguy said:
Do you go to different stations or always the same one? If same one, it could be just the stations pumps.

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It's been two different stations with the same "chain" of stores, so could be the same style of pump at each station. May try a different station. I just know that it's a real PITA!!!

09_4WD_YUKON · Mar 2, 2021

NOSOK said:
I didn't realize that's a known issue. Might be happening with our Suburban. 1st time it shut off every ~5 gal was when it was in the negatives so I chalked it up to the cold. Then last week I got gas and didn't realize until I had driven away the pump had clicked off after only half a tank or so.

It's pretty crappy if you have to replace the fuel tank to fix this. If you're going with that shop I hope you trust them because that's something they could easily recommend to get a sale.

Well, if you're topping off your tank, STOP now!! That is the main cause of this.

09_4WD_YUKON · Mar 2, 2021

kbuskill said:
When we did mine we disconnected the lines from the canister and pressurized the tank by wrapping a rag around the blow gun and sticking it into the filler neck where the fuel cap goes.

How bad was yours when you did this? Mine will take maybe 1/2 gallon, if that much, before the pump clicks off. And it appears that no one, except for GM, has the tank. Found it at GMpartsdirect.com for $619. And I'm assuming there is no need to try and find a used one, as I may just end up right back where I am now. Really f'ing aggravated with BS, already $410 into it.

kbuskill · Mar 2, 2021

09_4WD_YUKON said:
How bad was yours when you did this? Mine will take maybe 1/2 gallon, if that much, before the pump clicks off. And it appears that no one, except for GM, has the tank. Found it at GMpartsdirect.com for $619. And I'm assuming there is no need to try and find a used one, as I may just end up right back where I am now. Really f'ing aggravated with BS, already $410 into it.

Before I changed the canister, purge valve, and vent valve solenoid it had gotten to the point of kicking off almost immediately.

09_4WD_YUKON · Mar 3, 2021

Do these pellets just get in the vent lines? Can they get in th fuel line itself? If not, just the vent lines are the ones that need to be cleared. Think I'm gonna try and tackle it this weekend. Still not 100% confident in that shop I took it to.

kbuskill · Mar 3, 2021

09_4WD_YUKON said:
Do these pellets just get in the vent lines? Can they get in th fuel line itself? If not, just the vent lines are the ones that need to be cleared. Think I'm gonna try and tackle it this weekend. Still not 100% confident in that shop I took it to.

Just the vent lines. There is no way for them to get into the fuel feed line.

Got the dreaded slow tank fill

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