On my ifs40 imperial fryer the pilot knob just spins around and wont send gas up to pilot orifice when i push it in

SOURCE: GAS VALVE TIMING OUT

I had a simular problem. The gas company disassembled the pilot light and cleaned it. The fryer works perfect now.
Hope this helps!
Ken

SOURCE: Fryer pilot lit but main burner does not come on

IT IS A GAS PRESSURE PROBLEM CHECK TO SEE IF THERE IS A GAS REGULATOR IN LINE WITH THE GAS PIPE TO THE FRYER IF SO ADJUST REGULATOR TAKE TOP ALUMINUM SCREW OF YOU WILL SEE WHITE PLASTIC SCREW TURN WHITE SCREWW TO THE RIGHT ALL THE WAY IF SAME PROBLEM OR NO REGULATOR RESTICTION IN GAS LINE

SOURCE: Imperial deep fryer IFS40 pilot lights, turn on

Hi there, it sounds like your thermopile, for the pilot, is failing during use, when this happens, the small DC voltage it generates is less than the gas valve requires to stay open, and shuts off the pilot, which shuts off the main burners. Another thing that could be happening, is the hi limit is opening prematurely, instead of shutting of the pilot at 450 deg. it now is opening at 325, or 225 or 250. Sometimes the sensing bulb gets broken where it pass's through the oil tank causing this symptom. If you temporarily bypassed the hi limit to test this also, and it still goes off, you need a thermopile. If it stays on, check your temp with a reliable thermometer, and see if it reads fairly close to your setting, if so, then you need a hi limit.
Hope that helps, and thank you.

SOURCE: I NEED A PART´S LIST OF Imperial IFS40 Deep Fryer

Go to 3wire.com,register,its free and type your model in.

SOURCE: Imperial propane fryer won't stay lit.

check the high limit it tripping out