My EL starts on petrol but not gas i can't find anything in relavation to duel fuelling but i may not be looking hard enough so if there isn't this here is a thread

I haven't found the cause yet but wont stop till i find it

when changing over to gas it kinda sounds like its wants to start but doesn't and it smells like straigh gas is coming out of the exhaust
Any way going through troubleshooting in the official ford manual in the tickford section it says hold 3000rpm change over with a multimeter on the positive of an injector when it changed over it should read 0v in my case it still reads 12v.

The annoying thing is but the rectification basicly is:Rectify faulty wiring.thats all no check this check that.just rectify faulty wiring.

hopefully someone can help me out and shorten my day or i will find out with much pulling hair and bashing head whilst reading many wiring diagrams.