Gurgling gas tank?

[MT-PTK]

Gurgling gas tank?

I've noticed recently that when I get home and shut off the cruiser that I can hear the gas tank gurgling. I don't recall hearing this before. It's not continuous, you'll get a "Blub, blub, blub, blub"... and then nothing for 5 to 10 seconds, then: "Blub, blub, blub, blub". Sometimes it will go on for a while. I crawled underneath and nothing is leaking that I can see. I have noticed that I'll occasionally get a hard start when she's really warmed up, but other then that she seems to be running normally.

Any thoughts on why?

Thanks,
William

 

[FJ40Jim]

Because it is not desmogged.

Normal operation.

 

[Eporter]

Don't know if this helps, but...

I had a similar issue on a road trip from UT to CO.

My '83 wouldn't start after driving down the highway & stopping to get gas. Checked everything, messed around for an hour, it started right up.

Drove on, it happened next gas station. Changed the fuel pump. Nothing. Put the old one back on, it started right up.

Drove on, stopped to get gas again. Noticed the sucking "whoosh" sound when I opened the fuel cap.

Turns out one of the vent lines was clogged. While driving down the highway the pump was pulling sufficient gas, but once stopped, the lines would drain back into the vacuum of the tank.

It got so bad that I would have to open the gas cap to get the truck to start after just driving around in town!

Jim. C. gave me advice on the LCML (back in '03) and I switched some lines on the charcoal canister. Basically I'm venting straight air to the tank instead of filtered. I should fix that one of these days...

See if your gas cap sucks/vents next time you fill up.

 

[smkymntn]

Mine does that, and it is desmogged- but no starting/running issues. I just thought it was normal. Should I cap the line that went to my can ister?

 

[FJ40Jim]

No, do not cap any line to/from the canister. Just swap the two smaller hoses on top of the canister.

 

[smkymntn]

what if the canister is gone?

 

[FJ40Jim]

Then you're F-ed.

Hang something under the hood to use as a breather vent filter for the gas tank. Air needs to come in as fuel level goes down, vapors need to escape on a hot day.