fuel issue

[m1000snopro]

hey guys i went out on a little ride in the mountains and got out while the truck was still idling and heard and dripping noise and so i walked around the truck to investigate and the passenger fuel tank was spraying gas out, around and through the cap. i was running on the drivers side so i figured out that the drivers pump had pumped all the fuel into the passanger tank!

 

[m1000snopro]

does anyone know what could cause that

 

[89Suburban]

Yikes!!!

 

[79K10]

Stuck selector? I've Never heard of that happening , weird


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[m1000snopro]

thanks for the reply, I thought it was the selector valve i had a shop change it and when i picked it up it still was doing it, it was still pumping it, but it seemed like the return line was directed into the the wrong cause it was leaking now nit pumping