DuroMax XP10000EH Dual Fuel Generator runs well on gasoline, but will only start and run for about 2-3 seconds after priming regulator on LP gas. Changed regulator (new OEM) but same issue remains.

I am sorry to hear you cannot get your Generator started, First I think you should start by looking at the ignition system.
To find the fault please follow these steps:

1. Removed the spark plug from the engine and re-attach to the Ignition HT Lead. Hold the end of the spark plug tip to a metal section of the engine, and turn over the engine. If all is working correctly, you should see a strong spark, and the engine should run smoothly.
2. If you do not get a spark, you next need to check oil level is at correctly level (to the very top as if about to flow out) and repeat step 1.
3. If you still have no spark or it stops running within a few minutes of starting, disconnect the oil sensor wire (you will find it on the front coming from your engine just to the top left of the oil filler cap) and try step 1 again.
4. Still not getting a spark? Then you need to replace your ignition coil. You can order one from us from our website on this page: http://www.generatorguru.com/xp10000-xp10000e-xp10000e-ca/