First of all. I'm not an engineer and even I do not have any proper education. Also My english was broken (I'm self learner).

I hope I can translate my questions, regarding to building some kind of device to regulate LPG intake like Petrol Carburettor.

I had Ford Granada MK2 which has 2.8 V6 Cologne engine. It was carb engine. I had Weber 38 Dgas carb.

And My lPG system uses mixer device to use LPG on engine.

My Problem is.

In our country, technicians try to recistrct air intake to archieve smooth idle. They prevent air and our LPG mixer systems does not have any lpg intake control like carburettor.

So there was a constant lpg intake and recistired air intake. This was lead low millage and poor engine power.
(this was my idea, I can't prove with knowledge).

When I buy the car (also it was my first car. And thats makes me complete noob about cars and engines:) )
I see same installation. After some research, I found engines need clean and cold air for better power.
Trying to fix problem. I broke my original Solex Carb. Then I found current one. It was bigger and gives more power and better millage.

Anyhow after more research. I found a LPG Carburettor device named BRC BLOS SYSTEM. It was derivated work from SU/Stomberg carburettor.

Sellers claims only %5 lower engine power on LPG. They claim 18 MPG for 3.8 V8 on Land Rover. I can't reach that numbers with my 2.8 V6. Even I know 1.6 cars can't match my MPG.

This BLOS thing was sold only Ebay and seller was A polish man. I search local BRC dealers they even don't know the device. Also no info on BRC site. (Probably because of sequental injection)

And I even talk with Polish Ford guys about device. They say Ok. This thing was do the sellers claims. Importing was no so easy. And it was bit pricey to me.

So ?

After some thinking and searching, I found a device, named check valve. It seems very suitable to control air intake and  problem is

How can I translate Check valve swing movement to lpg intake valve control.

Or is there any other thing to do same job.

You need a proper LPG carburetor. Forget about check valves and the like, they are not going to do what you need, which is to let the LPG flow at a rate that is in proportion to the air. When you step on the accelerator to open the throttle, the carburetor has to let in LPG in proportion to this.

This is not high technology; LPG carburetors are used commonly in industrial forklift trucks.

There are companies that specialize in conversions of standard cars to LPG fuel - correctly. That is what you need to do. It will cost some money.

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