Re: School me on lp. gas

Posted by Steve@Advance on August 09, 2018 at 20:06:12 from (66.169.147.211):

In Reply to: School me on lp. gas posted by flying belgian on August 09, 2018 at 16:46:07:

Without seeing the system, a lot of guess work. Some of the early models do have a primer or choke.

Do a good visual inspection for loose connections, vacuum leaks, anything unusual. If you smell propane with the tank on, there is a leak. If it has a leak, and you turn the tank valve off, each time it's turned back on there will be air in the line. The leak needs to be located and repaired regardless. That may solve the hard start.

The fuel tank, is it vertical or horizontal? If horizontal, it needs to be positioned so the dip tube is on bottom. There is a hole in the side of the valve guard that aligns with a pin on the mount bracket. Be sure that hole is located down when the tank is mounted.

I'm assuming the hard start is caused from lack of fuel, but wouldn't hurt to look the ignition system over, check the spark at the plugs after it sits and is doing the hard start. Should have a 1/4" spark to ground at each plug wire. A new set of plugs just to say you did. Check the points (if equipped).

If all checks out, could be a problem with the lock off valve or regulator. The lock off valve stops fuel flow when the engine is not running. It delivers fuel to the regulator. You can crack the line after the valve, turn on the ignition or crank the engine through to see if fuel flows. This valve may be built into the regulator, if so it's hard to test.

The regulator is a very sensitive device. It normally stops all fuel until it senses air flow into the engine. Since very little air is drawn in while cranking, it takes a critical adjustment to safely achieve this.

Since it runs well after the first start, my guess is it is not the regulator. This component is best left alone unless you have the correct procedures in place to service and test it. Set it wrong and it can leak fuel when not running, very dangerous situation.

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