Not starting!

[T3luestar]

2.1 DJ Has been running great for the past week or so (on petro) drove home from work today no problems. Went to go back out after half an hour and the van wouldn't start. I unplugged the temp2 sensor and I was then able to force start it on gas, it would then run OK once it was plugged back in, but would cut out on petrol.
Any ideas would be appreciated, I'm in work at six.

[mioba]

Any relays there switching between the two fuels.

[T3luestar]

It'll switch between the two fuels and run when the temp2 is unplugged, but very poorly on petrol.

[T3luestar]

Started on the button at 5.30 this morning, running on gas, I've yet to try it on petrol.