Gurgling from tank?

[Unreal Summit]

So I hauled a small trailer and some lawnmowers today and after I got everything unloaded I went to unhook the trailer well when I shut off the truck I can hear gurgling from the fuel tank.  No pressure was relieved when I unscrewed the fuel cap but I can hear the fuel moving when it gurgles.  Then it did it again when I got back home and parked it.   Normal? 

[JAG1]

I think it would be normal only if you have an air leak in your fuel system somewhere. In other words your possibly hearing some fuel drain back to the tank because a fuel line or fitting is allowing air back in the system thereby allowing the tank drain back. most likely the air leak would be on the suction side where not much fuel leaking shows, but after shut down gravity takes over allowing air back in the system to drain back. Of course I could be wrong as I think about possible air/ fuel leak to the return side.

Edited August 23, 2019 by JAG1

[JAG1]

On edit; I now think it is more likely the return fuel is at fault. Possibly the return T. at the back of the head. It has somewhat common leaky problems.

[Unreal Summit]

Haven't heard it do it since that day. Idk what was going on. I will check the back of the head today tho. I am glad u said that. I haven't even thought of checking on it.