My Coleman 236 loses it's pressure within 8 minutes and needs constant pumping. I changed the cap seal not long ago. My question is can I use soapy water around the bits to check for bubbles? What are some other notorious areas for pressure lose?
Are you opening the valve completely when running?? Instant lighting Colemans require the valve to be fully opened after lighting. Otherwise, excess air is run through the burner instead of fuel only. This causes fast depletion of tank pressure.
While there may be a leak, it should be easy to find. If fuel isn't running down the side, that narrows it down to the check valve/air stem, fuel cap, and where the valve assembly mounts to the tank, or the fount has a crack above the fuel line. If none of that fails the soapy water test, then your air wire that plugs the fuel pick for instant lighting is stuck in the lighting position blocking the fuel pickup. It's sized to let just the right amount of fuel by for atomization by high speed air rushing past that mostly clogged hole. This requires removing the valve assembly from the fount and disassembling the fuel/air tube and cleaning the parts. As others have said, if you are leaving the valve in the 1/4 Turn to Light position, the result will be the same as a stuck air wire.
