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Thread: MEP 831 FAQ for owners or potential buyers

  1. #31
    Colonel robson1015's Avatar
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    I saw a couple batteries on e-bay (RG-24-15A1), $155 + shipping was the best price. What is the advantage of the battery besides the crank start and glow plugs??

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    The easy way is to connect batteries but if that isn't an option.

    You can start the engine by plumbing in a gravity feed tank to the mechanical fuel pump on the side of the engine. What I did was take a large syringe (sans needle) and stick it into the fuel line. I disconnected the line at the "T" fitting where the fuel return from the injector plumbs in. Pour some fuel in the syringe and let it drain down to the pump. It helps if someone holds everything so it doesn't make such a mess.

    You may have to crack the fuel line at the injector if the high pressure side has air in it.

    Once the engine is running the generator will power the pump to fill the lines and the fuel filter.

    Under normal conditions there is plenty of fuel left in the line to start the engine for the next use.
    Chris Medico
    MEP-003a (sold), MEP-803a, MEP-802a, & MEP-831a

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    Colonel robson1015's Avatar
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    Sorry about all the questions - just got my MEP-831A with 4 hours on it and I'm trying to educate myself a little.

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    Reading through some of the threads here in this section on the 831 will give you a good start.

    Download the manual and read the starting instructions. Put some fluids in it and give it a try. It should start up pretty easily.
    Chris Medico
    MEP-003a (sold), MEP-803a, MEP-802a, & MEP-831a

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    Don't apologize robson, every question you ask is one someone else doesn't have to. IMO it's part of what makes this forum so helpful.

    ...on the other hand, it is always better to read first and then try to expand the envelope of information rather if at all possible.
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    Colonel robson1015's Avatar
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    Thanx guys, I'm waitin on the fuel filter/separator(Racor) to get here in the mail and then I'll give it a go..

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    I've read the manual and everything I could find on here before I posted...thanx for the help

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    Quote Originally Posted by robson1015 View Post
    I've read the manual and everything I could find on here before I posted...thanx for the help
    You should be in pretty good shape when your parts arrive. Let us know how it goes.

    Alternatively you can use a pair of motorcycle batteries in there.

    I've also used a set of jumper cables from the batteries on my MEP003a to prime up the fuel system.

    The Yanmar engines start pretty easily in moderately cold conditions. If its below freezing batteries are nice because you'll need to pull by hand it several times to get enough heat to kick it off. The intake heater shouldn't be needed unless the temps are below zero.
    Chris Medico
    MEP-003a (sold), MEP-803a, MEP-802a, & MEP-831a

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    a battery heater would be nice lol, but that means you have power and thus no need for the generator lol.

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    Update on my mep-831a....2008
    I got the fuel filter/water separator installed after filling with fuel. Bought two batteries and unit started right away. Starts very easily with pull start also. Everything functions as it should EXCEPT the fault indicator lights don't work. test/reset button does nothing. I suspect it needs a new fault indicator part # 29390. It is a brown box that has a wiring plug in the rear with all the fault indicator lights on the front. Any input on where I can find this unit?? I'm very happy with the MEP unit but the fault indicator is needed. Any help appreciated.

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