6 Pack losing prime overnight

[lyndondb]

My 440 six pack loses fuel prime overnight. Takes 30 to 40 seconds grinding the starter to pick the fuel back up. Starts all day fine afterward. But overnite same thing again.
Anyone got any ideas.

 

[idrivemopar]

I have the same problem with my 340 and thermoquad. I chalk it up to heat soak after I have been driving the car then park it, I think the fuel is just hot enough to evaporate through the vent tubes or canister line leaving the bowls empty.