what are the differences in the 12a pump and 13b gsl-se pump. I unfortunately bought a gsl-se that someone put a 12a into to save them some bucks i guess. I am having idling problems and idle speed and mixture adjustments aren't helping. I am thinking the 13b fuel pump is giving the carb too much pressure....any ideas? I couldn't find any tech info on the 2 pumps.

um, the SE pump is for fuel injection, so I'm not exactly sure on the specs of that pump but I am sure you have atleast 20-25 MORE pounds of pressure than you need, as a carb only needs between 3-8 lbs of pressure to funtion properly, go get a pump from a 12a