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By Kierobi
Have a MSU 500 that we got from my wife's uncle a while back. We've had it running and hauling around the property but it stopped a few months ago after what I thought was running out of gas and I'm just getting to looking into it.
Had fuel to the injector but nothing coming out the injector so swapped with new injector and installed inline filter in the supply hose from fuel pump. Tried again and still nothing but noticed this time that I can't hear the fuel pump priming.
Pulled off the electrical connection and I'm getting 12V to the fuel pump but it won't run. Put it on a test bench and got it to run so put test lamp between +ve and -ve terminals on the connector and nothing. Checked against the passenger seat securing post and get a light.
Tried chasing the wire back and think that the ground is through the ECU but not 100% sure. Can someone confirm for me? And if it is through the ECU, is the ECU just grounded against the frame or is it wired through to the battery?
Thanks in advance and hope this all make sense!
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By Jeff freeman
I have a Coleman 550. Was having problems to start with where it would start and then shut off after a couple tries. It would take off and be good. It then got to a point where it would not start at all. I replaced the fuel injection twice the second time I replaced it I noticed a mouse or something had chewed one of the wires that connect the electrical to the fuel injector. . So two-part question first does anybody have a part number for that wire harness? Second, any other ideas after I fix the wire harness permanently on what could keep it from starting I have gas flow up to the fuel injector.
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By Big Dave11
2025 hisun ntx 550 intermittent clunking sound every 5 to 10 seconds coming from engine compartment when going gown hill in high gear two wheel drive with foot off the accelerator. Any suggestions would be helpful.
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By riggy400
Bought a Coleman 400 UTV (pretty much a Hisun), the previous owner tried to replace the timing chain, couldn't time it properly and sold it to me. After some hours I figured out how the timing all is supposed to be set (I think/hope) and as I am reassembling, I noticed that the water pump gear was awfully hard to spin. I held the gear with my hand and spun off the impeller. I checked the bearing, spins great no obvious issues noticed other than this o-ring which seems to be out of place? When I remove this o-ring and reassemble the WP, it seems to spin nice and easy without a drag. I looked up the service manual (although very inaccurate info there often) and don't see this o-ring present. Am I missing something here or what? Any input?
This is not easy to access once the engine is back in the machine so would like to avoid having to deal with this if it becomes a problem.
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