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I can bet most of the people that have these sets don't have the variable speed setup properly. If you didn't adjust the magnet it self then I can help, but if you adjusted the magnet then I can't. I'll dig out the procedure later today and send to you. Do you have a source of 3 kW load?

How did you tweak the magnet? There is a very specific adjustment procedure for the governing system on these sets. If the adjustments aren't made properly then the variable speed concept of these sets will be no good. The speed increases with load so the more load you have the faster the engine...

If I were you I would just remove the sender and get a new one. Mess with the old one later, It sounds to me with the J7 connector you have bigger fish to fry. I believe if you short out the sender wire to ground it should read empty.

Not easy to remove from the tank because the float is offset. The resistor is not sealed it's exposed in the tank and sometime the resistor gets messed up. If you remove it place an ohm meter across the center terminal and the mounting flange and you should get 0 ohms down (tank empty) and 31...

There is one on ebay right now for $22

Yes sometime the wire gages overlap and that's the only difference in the pins. Sounds like you have a bad fuel sender. Have run my house with mine, you have to watch what you put on but it does it. Very clean power I have never seen a cleaner sine wave on a genset.

I checked Amp's website and I cant come up with that number. Where did you order it from? The connector is Amp #206151-1 cross reference which pins go into that connector.

If you're pretty sure it's the B+ in J7, then that would be pin #17 You only have to extract that one pin, need Amp extraction tool #305183 and replace pin with Amp #66098-9. Should be able to get at Newark electronics but you will also need crimping tool for that pin. But could just try to...

Early production Mep831's had a Yanmar made in Japan later they went to Italy for production. The earlier ones had black plugs in the valve cover that were cut off and the plug was glued into the cover. Yes the sets will run without the battery it should run off the battery charger. No need to...

What you have to lookout for is the engine may not have only 100 hours on it. Some of these sets were reset at Letter Kenney and are not what they seem. If you get into trouble let me know I have several of these units and parts. I've been working on these sets for almost 20 years, great sets...