New Updated Harbor Freight Predator 3500 Ver.2 - How to Install Propane Natural Gas Conversion Kit

Great video. Thank you for the explanation on the feeler gauge for spark plugs. Always wondered what that tools was used for. I had no idea about the 3 bends rule on plugs. Good to know. Thanks for all the tips and look forward to installing the kit on my new predator.

I carefully followed the simple straightforward instructions, and it started on the first shot. Easy job! Thanks.

I am very happy with both the quality of the kit's components and how easy it was to install. The installation video is very clear and contains a lot of good information in addition to the step by step procedures. It is obvious that a lot of effort went into the overal design. All of the parts fit with no adjustments or rework needed. I modified the installation a bit by running the wires to the light bar through a 1/4" rubber grommet that I installed just above the Off/Run/Start switch. This makes the finished product a little neater looking. I think the price for the kit is very reasonable considering the quality of the components and the well designed parts. My engine started on propane the first time I tried it and I did not notice any change in performance from gasoline. I looked at several DIY kits and in my opinion, this one is the best. The machined propane injector block should last far longer than the engine itself.

Like you videos. Very informative. I have a Predator 5000 and Duromax 16000ih. Both dual fuel. Have you or plan natural gas conversion for Duromax 16000ih? Really need one and like what you did for Predator 5000. Hope you do one soon. Thanks. JH

Andy, did you say you recommended a different heat range for LP in a different video? What’s the part number for the iridium plug recommended? Thanks for a great kit. I have two version 2’s to run in parallel during peak times.

There are at least 3 versions. The latest version pushes the twist lock all the way left, the parallel connections are towards the middle, there’s no rubber caps on the reset buttons, and the battery door and lock are back on the right.

Do you have a video on how to bypass the Co2 sensor on the newest model? Thank you

I might have missed this question. but how does it combust with propane and does it cause any longterm issues when used interchangeably with gas?

Subscriber #500

Any input on raw "well gas"?

Can i run a 120 gallon tank with this set up or am i limited to only the 20's

I was under the understanding that if running on propane or NG the fuel supply must be cut off because an empty tank and an open fuel line would cause a vacuum leak. If you tried to run on propane with an empty tank and the switch in the run position (fuel supply on) this would be an issue, therefore the mod to enable ignition with the fuel supply off if necessary. Is this correct? Thanks.

Can still parallel them together?

Where can I buy the magnetic dipstick for version two. Is it different from version one?

I have version 1 before it had a fuel gauge.