Do your homework first before spending money to set up a filling connection.
Wellhead gas can be a very different quality and composition than the pipeline quality gas that is sold to residences and businesses. There is a reason all those gas processing plants get built.
It might be fine as is. You might destroy an engine. You might do worse.
I have old leases on my ranch that give us free gas for use in heating a rather large chicken-raising outfit.
1. Gas does vary, even from the same well. It also has no smell, except H2S, which, if you smell (rotten eggs), run the f—k away because you are about to die.
2. You will inevitably get liquids and solids in the process. The liquids are things like propane, natural gasoline, etc, and have value, but pretty much just need to be added to the tank battery because you won’t be able to market them, and the oil company can. They also blow up and clog crap up.
3. Recently, at least where our ranch is, the state has all-but outlawed free gas and you have to meter it and pay severance taxes on it and a whole host of crap that would make a new installation questionable, at best.
4. I am a fan of liquified natural gas, in general, especially in fleet vehicles. It’s cheaper and you can often dodge upwards of a $1/gallon of tax on it. We use it in certain of our big rigs (I own a drilling company and service company). They pretty much drive in a loop and come back to the yard to be re-filled. This works very well and when diesel was so high, I was saving $2,50/g — and now it’s $1.50, but still worth it.
For an individual vehicle? Probably not.