MEP 531a surging/hunting

[djdalfaro]

Hi guys, new to the forum. I just picked up this MEP 531a and I'm trying to get it running smoothly. I've gotten to the point where it stays running after starting, but it's surging an hunting and not smoothing out. I have read what I've found on the forum concerning ensuring the oil is not too full, and I drained the old oil, and have added about 600mL of fresh oil which brought up the level to the full mark with the dipstick screwed in. Any advice or suggestions to point me in the right direction would be greatly appreciated.

MEP-531a rough running

 

[LuckeyD]

Good Day: Open TM 9-6115-673-13&P to page 0013-1 and 2. Follow the steps. this will either resolve the issue or narrow it down to a couple possibilities. It is usually a fuel issue, or something related to it. Let us know what you find! Cool!

 

[djdalfaro]

Good Day: Open TM 9-6115-673-13&P to page 0013-1 and 2. Follow the steps. this will either resolve the issue or narrow it down to a couple possibilities. It is usually a fuel issue, or something related to it. Let us know what you find! Cool!

Thank you. I've got new filters and fuel line coming in so I will replace those, flush the fuel, and start with the troubleshooting list.

 

[FarmingSmallKubota]

do yourself a favor and make sure the fuel line between the filter and fuel pump is clear so that you can see air in the line and bleed accordingly.

 

[djdalfaro]

do yourself a favor and make sure the fuel line between the filter and fuel pump is clear so that you can see air in the line and bleed accordingly.

Thank you. Yes, I had seen the recommendation and new Tygon line should arrive tomorrow along with new fuel and air filters. One thing I know is contributing to my issue which will get fixed is the port elbow for the fuel pump supply is missing an o-ring, and so I know I'm getting air in the fuel system at that point. I noticed some sputtering at that point and when I hold the elbow down the running characteristics do change. I'll replace it when I do the rest of the fuel system in the next couple days.

 

[2Pbfeet]

Thank you. Yes, I had seen the recommendation and new Tygon line should arrive tomorrow along with new fuel and air filters. One thing I know is contributing to my issue which will get fixed is the port elbow for the fuel pump supply is missing an o-ring, and so I know I'm getting air in the fuel system at that point. I noticed some sputtering at that point and when I hold the elbow down the running characteristics do change. I'll replace it when I do the rest of the fuel system in the next couple days.

Good catch. These engines are quiet intolerant of air in the fuel.

All the best, 2PbFeet