[GenKnot]

Which Duramax model? Most clothes dryers typically have a one half inch pipe running to them. That may be insufficient for your generator. It just depends on how long your runs are and which model generator.

 

[GenKnot]

That length of hose/pipe and the I.D. may be your problem. You may need a manometer to test the pressure you have available too. It is a combination of pressure, length, and I.D. that needs to be correct to supply the generator with enough fuel to run. The pressure at your clothes dryer is likely already reduced for that appliance. You may need to run a high-pressure line from the tank and then have a separate regulator at the gen as oldcodger is suggesting.

Take a look at these links and it will give you an idea of pipe sizing for propane should be at 100'+. There are more charts available, I just picked a few...

Installation Information and Pipe sizing – Motorsnorkel by US Carburetion

motorsnorkel.com

Propane Hose | LP Gas Line Sizing Chart | Propane Warehouse

Refer to our LP gas line sizing chart to equip appliances with tubing for propane tank fittings. Includes copper and polyethylene tubing sizes.

propanewarehouse.com

Propane Gas Piping - Low Pressure Capacity vs. Size

Sizing of low pressure propane gas pipe lines - Imperial units.

www.engineeringtoolbox.com

 

[GenKnot]

most rural lp systems in my area are small line liquid to the house then the first stage regulator

Wow, I have never seen that. How is the liquid to vapor conversion done? Do they have a secondary tank at the house?

I have heard of running high pressure vapor (such as 10 psi) from the tank to the house and then regulating down to lower pressure. This allows the line size from the tank to the house to be smaller (as you stated) and thus cheaper to run.