I am finally getting the M going in the field but have only done a small amount of work. It has been converted to LP and runs well and starts easy after I put in new points, plugs, distributer cap and rotor. The problem is that within a few hours of running (maybe three 1/2 hours) I am nearly out of fuel. The tank is a 32 gallon tank and I just put in 28 gallons and It is all used up. I cannot find any external leak (no icing and no bubbles when checking with a soap solution). It doesn't appear to leak when the engine is not running either. Could someone explain how the regulator works? Could it have a leak and let a lot of excess fuel run through when running but not affect the running of the engine? I cannot afford to keep spending $37 dollars to run the tractor for 2 hours. Your help and expertise is greatly appreciated.

Hi Matt, You need to buy a service manual as there's alot of adjustments and it will also explain how everything works. Remember propane is heavier than ambient air and will settle at the ground so I suggest until you get every thing running correct, keep your tractor stored outside well ventalated.

A regulator is a constant pressure device and takes a higher pressure input to a low pressure output at a constant gas volume. They can be liquid inlet, vapor outlet or vapor inlet, vapor outlet.

T_Bone

And if it's not factory LP you need a manual from the manufacturer of the regulator you have.

Thanks T_Bone, I have to keep it outside because I haven't got a barn built yet. I just got the land last month. I understand the regulator's function and I think mine takes High pressure gas and makes low pressure gas. I was wondering, and this probably won't work, I have a regulator off a propane tank that I had bought. Could I maybe put this in the line and replace the regulator with it? It may not work because it may not supply enough pressure (it was designed to replace a regulator for a barbeque grill). It might supply enough but then under heavy load, starve the engine for fuel. It is just a guess because I like to save money if possible.
Does the regulator off an engine allow more air in under load or is it, too, constant but at a higher pressure?

Hi Matt, no it won't work. BB-Q regulators are good for 125,000btu. It's not the pressure but the volume of gas. The best thing you can do for yourself is buy the service manual before you hurt someone! You need to understand how this system works.

T_Bone