what is up with my picco .12 it was running a week ago and i tryed it last night and it wouldnt run fuel would go through the fuel line but when i would quit turrnig it over on my starter box the fuel that was in the line would go right back in the fuel tank?

it is colder now than it was a week ago could that be the problem?

It may need to be richened up a bit for the colder air but it should fire up,,
Did it start at all?

Check the usual things, glow plug, fuel lines, air leaks etc

it didn't even start i used a new glow plug and it still didn't work and my igniter is coming off of the starter box

Did you look to see if the plug was actually glowing before you put it in the engine?
the glow heater might not be working, they get dirty, burn up, I had one die on my ofna starter box

will check that i also have an offna starter box does your igniter spark when you touch metal (box, engine)

only if you plug it in backwards