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Gurgling sound in gas tank after shut off

Mastiff

1/2 ton status
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Anyone ever had this? Any idea what it might be? This is for my TBI K5. I never noticed it before, and everything is running great. I just want to make sure it's not a leaky fuel line or something.
 
Mine always did that, think it's just relieved of the pressure
 
Anyone ever had this? Any idea what it might be? This is for my TBI K5. I never noticed it before, and everything is running great. I just want to make sure it's not a leaky fuel line or something.

Make sure the tank is vented properly and doesn't have a clogged vent hose.
 
Make sure the tank is vented properly and doesn't have a clogged vent hose.

I should have mentioned that I did open the cap and there was no pressure/vacuum relief at all. The gurgling continued with the cap off.
 
I should have mentioned that I did open the cap and there was no pressure/vacuum relief at all. The gurgling continued with the cap off.

Could be the beginning of vapor lock. Does the exhaust get real close to the tank anywhere? What is the outside temps where you live?
 

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