Hello guys,

I have a e38 740i with m60b40 engine. My car has a LPG.

When i was a use with fuel this car there is no problem with engine sound, just a little bit raw exhaust smells and idle miss firing.

But, if i use with LPG in a few kilometers (100-150) sometimes comes weird noise in engine, like the lifter tapping.

And i look at the forums and i saw the fuel ventilation valve problem. I’m open the hood but i cant find my ventilation valve... I think previous owner remove this part on my engine and blanking the hose.

How can i fix it ? I think this noise coming from that problem...

Sorry for my English grammar, thanks for everyone.

https://youtu.be/_NaHX04vdZQ

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