sometimes the knob stops the gas control valve from working properly, do not refit the knob yet. Its the 1st and easiest check. Check gas bottle has plenty of gas, maybe swap or change the regulator. Your gas control valve may still be nfg. Next check is flame size. If the flame looks too small you could have a slightly blocked jet, take off and clean rusty toot around the jet housing. Disconnect sparker tip, thermocoupling and gas pipe (turn gas off) this is encased in a metal box below the exhaust and can be accessed thru the lower vent. You may have to move the fridge forward a foot leaving all the pipes connected, there should be enough slack in the pipes and wiring. Only remove the fridge if you have to. The jet size is very small, clear with the tip of a pin. Put it all back and see if it lights and stays on, leaving the fridge half out. If you still have a problem, you've just done the 2 free checks that 99/100 cures a gas problem you discribed with a camping fridge (98/100 its the knob). Irritatingly the next check is the thermocoupling, because 99/100 it doesnt cure the problem, but its cheaper than replacing the gas control valve which is the last thing it can be. I have never needed to replaced a gas control valve. And have not replaced a thermocoupling that was the cause of the problem in many years. Sorry if any errors (done in a rush) Let me know how you get on. Have one of those cold beers on me ;-)
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