MEP-501 Conversion & Modified Fuel System

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rustystud

Well-known member
8,487
103
48
Location
Woodinville, Washington
Well I finally got tired of my MEP-501 and decided to convert it to 240 Volts AC, (2KW) . Making it a MEP-531 basically.
I also changed out the fuel system. I don't know about all you guys out there running the small Yanmar engines, but every time I replace the fuel filter it is a pain in the butt to get the machine to run again due to air in the lines.
So I installed a 24 volt Faucet pump along with new "PTFE stainless steel" lines.
Now I just hit the start button and BAM ! She's up and running. There is also only two rubber lines to worry about now. All the rest are PTFE stainless. I installed a switch valve so I can use either the small factory tank or get fuel from my large tank which will be mounted in my M105 trailer later for the "Great Alaskan Adventure" . The switch right now doesn't handle the return fuel, but a 6 port switch is on order.

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rustystud

Well-known member
8,487
103
48
Location
Woodinville, Washington
Well I found out why my MEP-501 was being such a little ass all the time I owned it. There was some loose wires from the engine side in the electrical panel. I just "assumed" it was a fuel problem all along. Turns out the crimps where not holding and the wires where coming out, even though they used heat shrink tube on them.
This is why I am such an out spoken advocate for "soldering" the connectors. After I finish converting the electrical panel, I will go and solder all the connections. I have never had a problem after soldering a connection on a vehicle or anything else.
Here was one of the worst offenders. I re-crimped it for now.
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What is so annoying is I would never had found this problem unless I had taken the wire loom apart. It was buried under the other wires and wire-tied together.
Remember this was a "factory" crimp too ! A crimp made with the "proper" tool, and it still failed.
 

CallMeColt

Member
305
15
18
Location
Wilson County, Texas
I like what you did with the fuel lines. Great idea.

When I did this, I had a problem with the generator not matching up quite like it should have on the crank shaft & had the machine a little bit off the mounting plate. What generator head did you use?
 
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