[3.5 v8 non carb fueling issues after new pump and 8 mm pipe fitted]

Hi all newbie here.

i have an 89 rrc 3.5 non carb v8, on LPG, which ran perfectly well untill the other day i have done a lot of welding work etc etc, installed a new 25 litre petrol tank (as i didnt have one, just a jerry can with the original pump inside) to start her up before switching to gas, problem is now my mechanic mate seems to think we may have a fueling issue also a ignition issue.

sometimes starts

sometimes wont

sometimes starts and runs at 3000 rpm

sometimes takes ages to start like its got no spark/fuel then spurts to life.

fuel pump was for a 3.9 v8 rated

and new 8mm ID fuel line front to back booth flow and return

disconnected the condensor from the + of the coil and it started so thought that was the issue but tried with it re-connected and it work.

does anybody know the test for the condensor as i may be braking down with the initial start up,thus shorting out the coil,, also

(not noticed by me as im a lowly spark) but my mechanic mate noticed a part missing from the ignition system carnt remember right now what he called it tho ( will post for now and review later)

any help or suggestion would be very much appreciated