Fact is, many/most non-pressure tanks will hold pressure. They are one-way vented so air can enter the tank but not flow out. This is because of laws that say the fuel system cannot emit fuel vapors. Now hold on, you guys, I’m very aware that some old tanks have two-way vents because they were made prior to the emission law or do not comply. I did say many/most. The point is that they can build pressure due to sun/heat/agitation,, etc. ANY tank can be dangerous if in defective condition. Especially true in the case of rotted hoses, etc. As far as exploding, well maybe if the bottom is rusted out or something. Relief valves take care of normal pressure situations.
The carb float on those old OMC twins is hinged at the aft end of the carb body,, so it hangs downward when the motor is tilted, thereby closing the inlet needle&seat.. If it floods when tilted, suspect the carb, or float setting, rather than the tank Can’t say that necessarily applies to some other motors..
