Hi,
I assume you use the Snapper mower to move your pop up around to keep
this on topic :)

It could be a number of things.  Gummed up maladjusted carburetor, bad
gas, bad gas filter, bad air filter, choke not working, primer not
working properly if equipped with one, worn points and or condenser.

 Check and replace/clean the filters as necessary. If the carburetor
has never been cleaned, rebuilt or replaced I would look to that.
Try using carb cleaner on it.  Most of these are not designed to run on
E85 by the way and that stuff will usually gum them up.  Lots of info on
Briggs engine on the net if you do a Google search.


Take care and Happy Campin...

Regardless if it belongs in ARP-U-T or not, I can offer some insight.

I have a Briggs powered McLane reel mower, that barely lasts the summer
without needing service. I need to choke it more and more and eventually
it just won't run any more. I take it in and they say it needs a "carb
kit."  That's normal they tell me. Three different shops.

Finally I'm able to discuss with one of the old guys that actually works
on the engines and he tells me because of EPA regulations, they have to
make the fuel ports so small that they clog up easily.  Most modern
small engines do not have any adjustments.  Once it clogs, you take it
apart, clean it out and put in a new needle valve.

And here is the link to make it on topic and relative to ARP-U-T:  Many
pop-up-ers and RV'ers use generators - which suffer similar maladys. In
reading thru many posts about hard starting or non-running generators, I
find many recommendations for: "Fuel additive."  Gas tends to not be
used quickly in small power engines causing gunk build up.

One summer of adding a little Sea Foam to my fuel and the engine is
still running smoothly. Another product recommended is "Sta-Bil"

Good luck.

Tom