I agree with Mr Sunshine. I routinely store mine between trips in FL without power, usually for at least 4 weeks...sometimes much much longer.
It doesn't matter for only 4 weeks, but I try to store with the gas tank as full as reasonable, and with sta-bil added....but again... for 0nly 4 weeks I wouldn't be too concerned.
I remove any food that might attract rodents and insects...basically anything not in a can, jar, or other hard container. This might not be such an issue depending on where it is.
Put a little extra water in the bowl to minimize the chance of drying out the seal.
Imperative that the fridge doors are propped open.
close all the window shades, blinds, etc...
disconnect the batteries.
leave a roof vent open....or not.
and go have fun with no worries.
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