Gas spurts when filling up (2 Viewers)

[Seabert]

Hi mud, need some help here. Like many others, I had the hissing and pressure issues with my fuel tank. I swapped my charcoal canister with the VC 120 a while back which eliminated the hissing completely and was able to fill up my tank again with no issues. I thought I was in the clear!

I started having little dribbles when filling up and thought nothing of it, but lately it's been getting worse. Also have been questioning if I've been filling up to full. I've think that my fuel gauge may not be accurate. There's no hissing or vacuum when I go to open the gas cap. Any ideas on where to start?

 

[Devils Paw 80]

What does this mean-"having little dribbles"? Gas is leaking somewhere?

 

[Seabert]

Sorry for not being clear, I meant gas dripping from the nozzle as I’m filling up due to what could be back flow, positive pressure, or maybe back splash?

 

[Devils Paw 80]

Sorry for not being clear, I meant gas dripping from the nozzle as I’m filling up due to what could be back flow, positive pressure, or maybe back splash?

Gotcha, thanks. Yeah, I don't know. Possibly a clogged vent somewhere?

 

[bhsdriller]

I've had that happen a few times also but literally like shooting out while filling

Replaced mine with a VC120 probably 5 years ago. Maybe just due again idk
Now I just fill on the slowest pump setting

 

[landtank]

I had that a moth ago when I drove cross country. Basically the fuel in the tank had heated to a point where the tank was pressurized.

I started to pay attention to tank pressure when I first took the cap off. And started to add fuel slowly at first to allow the new colder fuel from the underground tanks to cool off what was in the truck.

I have fore and aft skid plates and think they limit airflow some

 

[Broski]

Always stop fueling after the first click. Never top off.
The extra fuel and vapor are going straight to the charcoal canister.

 

[GeoRoss]

I had that a moth ago when I drove cross country. Basically the fuel in the tank had heated to a point where the tank was pressurized.

I started to pay attention to tank pressure when I first took the cap off. And started to add fuel slowly at first to allow the new colder fuel from the underground tanks to cool off what was in the truck.

I have fore and aft skid plates and think they limit airflow some

I did the same thing this summer driving from Telluride to AZ. Let it vent slowly for about 5 minutes and then slowly added. This still happens after warm, long highway trips. I installed a NOS OEM canister last year and didn’t really help.

 

[landtank]

I did the same thing this summer driving from Telluride to AZ. Let it vent slowly for about 5 minutes and then slowly added. This still happens after warm, long highway trips. I installed a NOS OEM canister last year and didn’t really help.

At one point in Salt Lake City the transmission himp was so hot my phone powered off. And my AC was cranking
My exhaust runs over the frame like the 93-94 models and it needs some heat wrap.

 

[Seabert]

That’s an interesting point that I hadn’t given much thought, I lately have been filling up after long drives so the tank may be hot and more pressurized. I’ll have to fill up at the beginning of a drive next time and see if that makes a difference.

And of course, I never top off.

 

[jonheld]

I ran into the pressurized tank issue while driving to the Rubicon. I was somewhere in Nevada with ambient temp around 104F. I had to let the tank vent while I had lunch before I was able to fill up.
Combination of temperature and altitude change.

 

[landtank]

on a side note. During these times of driving distances in hot weather it was usually accompanied by the Charcoal canister hissing and a kerosene smell from under the hood. Working on my truck a couple of years ago I spotted 2 kinked hoses that were part of the EVAP system and replaced them. This trip with all the heat I never had the smell or hissing. The hoses in question travel from the front of the engine to the back under the throttle body. And the connections is one on either side of the throttle body.

 

[Devils Paw 80]

That’s an interesting point that I hadn’t given much thought, I lately have been filling up after long drives so the tank may be hot and more pressurized. I’ll have to fill up at the beginning of a drive next time and see if that makes a difference.

And of course, I never top off.

Good idea. If this has been a consistent issue, happening in fall and winter too, that would rule out the hot weather effect.
However, your MUD join date suggests you've only had the 80 for a few months, possibly?