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Thread: MEP 803A Surging, Not holding frequency

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    Default MEP 803A Surging, Not holding frequency

    I have a MEP 803A that is new to me. it starts right up and while it's cold runs great, once it warms up the frequency won't hold steady. i shot a video showing this. it is very long but it is one cut from start up to shut down. Any help would be appreciated. If you are reading this directly after me posting just be patient on the video as it is currently being uploaded.


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    Hello, Have you done any service on the machine? Fuel filters, oil etc? and have you tested it under a load?
    I'd be curious to see if the frequency swing starts sooner and is more pronounced when under a load.
    My first thought is a fuel supply issue which will probably be exaggerated if you test under a load.
    Also, make sure the fuel cap vent ( on the inside of the cap is open and not in the closed position.

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    To me it seems to be a fuel delivery problem. Starts to starve, RPM's drop, gets fuel again and over revs causing Hz to drop and then go high.
    Possibilities in my mind are...
    - Failing primary fuel pump?
    - Crap in the tank randomly clogging fuel pickup?
    - Clogged fuel filter on the primary fuel pump?
    - Clogged primary and/or secondary fuel filters?
    - Water in fuel water separator?
    MEP-831A Governor Controller Replacements for the SLC100, 2990-01-477-1371, 98-19539.
    https://www.steelsoldiers.com/showth...49#post2176649

    MEP-802A/MEP-803A Remote Start Kits

    https://www.steelsoldiers.com/showth...57#post2208457
    MEP-802A, Two MEP-831A's

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    i took the gas cap off and it didn't help, i cant figure out which position is open and which is closed.

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    Inverted cone inside fuel cap has 'OPEN' and 'CLOSED' stamped on it. Point the small cross bar at 'OPEN'.
    Attached Images Attached Images
    Last edited by Zed254; 06-26-2019 at 13:16. Reason: Added pic

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    I agree sounds like fuel delivery. Fuel pump not able to deliver enough fuel, filters clogged or something blocking the fuel pickup in the tank.

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    Quote Originally Posted by Zed254 View Post
    Inverted cone inside fuel cap has 'OPEN' and 'CLOSED' stamped on it. Point the small cross bar at 'OPEN'.
    Often the fuel cap is the first thing to get rusted on the inside making it difficult or impossible to read the "Open/Close" markings. Sometimes you can take a pocket knife, or what have you, and scrape the rust off and read it but the rust usually comes back fairly quickly. Regardless, I always know that it is in the "Open" position if I can pull on the center of the tab and the spring underneath allows it to travel up just a bit. If its tight feeling when you pull up on it, its in the "Closed" position. Another way to know is that in "Open" it allows the crosswise piece to fall into the lower most indentation in underside of cap with the help of the little spring holding it up. Think of it as having a sealing gasket on top of a small hole and when its pulled down tight its "Closed" since the underneath tab is in the raised position on the cam keeping it tight .
    #1 House Gen PU-751/M: 1986 MEP-002a/M116A2 w/Aux Tank & OEM cover
    #2 Spare Gen PU-751/M: 1991 MEP-002a/M116A2 w/Aux Tank & OEM cover
    #3 Shop Gen NF-2 Enclosure: MEP-002a w/Aux Tank

    * Disclaimer - My comments on this forum are based on my opinion and my experiences only. Any information or suggestions I share could sometimes be inaccurate or misinterpreted. It is your responsibility to verify any information before using or to hire a professional.

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    OK. Let clarify what we saw with the clip. I watched it 5 times. The gen set ran with no load, most of the clip? Or did it have a load the whole time? Or you put it on load, and then it started hunting? Or with no load, after warm up, it started to hunt? What I do see is you pulling the plug out, and sticking it back in, under load. That WILL cause it to hunt. And its not good for the plug, nor 120 volt outlet. Try that at night, and you will see a great big fat arc. Also noted, your percent of rated load meter is not reading. What position do you have S8 in? Because S6 control what you should see on the meter. They have to be in the same ball park, so to speak. The reason I want to see what the % rated load is, so we can see just how big your load is.

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    I had a surging 802 before. If i remember right there was a plunger that was stuck on the injection pump. You could also try adjusting them as per the TM.

    Of corse all of this should be after lunricated new fuel is put in and the fuel filters changed.

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    found a large 240v 10kw heater that took it up to 75% load on the gauge. frequency drooped a good bit but held steady, only thing disconcerting was the embers and blue smoke that came out of the exhaust.

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