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Komatsu FG25S-4:
Forklift Misfires When Warm and Shuts Off Under Heavy Load

I have a Komatsu FG25s-4, which misfires when it is warm. The misfire is slight. However, the forklift shuts off whenever I lower an object with it. It will lift perfectly fine. It used to only shut off when moving an object sideways. Could a bad fuel pressure regulator cause this? The forklift has an IMPCO Model J fuel pressure regulator. Is there a way I can find out if the fuel pressure regulator is bad?
  • Posted 6 Sep 2019 02:45
  • Discussion started by Michaellong
  • California, United States
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You can either open it up and check it out or run a pressure check. Pressure should be 2-4#. The test port is a 1/8" pipe hole in the rear of the regulator. Kits are cheap for the model J.
  • Posted 6 Sep 2019 23:58
  • Reply by BREWSKI
  • Nebraska, United States
BREWSKI
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