01 WJ not starting after bypassing evap can

Hi All,
My first thread so hopefully I get a response.
Firstly I will say I built a rear bar for the WJ a few weeks ago. When doing this I thought I would try to bypass the evap can for some extra clearance. The car ran fine for about a week and did at least 100 miles. Then driving on the freeway it just cut out. My first thought was the evap can. I noticed the LED lights were dropping of on the fuel selection switch LPG/ gas. After tracing some wiring I found a loose pin on the plug feeding the switch. Turned the key and all lights for the switch came on and car fired up first time. I drove home approximately 40 minutes with no issues. Next time I go to start the car same problem. I removed the plug and soldered all the cables together and still the same problem. It doesn't seem to be throwing codes. I should be able to select between LPG and petrol but I just get a red LED to the switch for about 1 second and then it disappears. Does anyone have any ideas?