Discussion:
No start - vacuum issue

Let me start by saying I am in no way a mechanic but I know enough to get myself in trouble lol.

I have a 2000 Komatsu FG25ST-12 with a propane Nissan engine. I had issues with the machine starting but immediately shutting off. I had my mechanic come onsite for a brief look and he suggested a vacuum issue and to change the LPG converter. I changed the converter module as well as the lockoff module. Hooked everything back up and still same issue. If I disconnect the vacuum hose on the converter and suck on it while turning over it fires right up, then shuts off again as soon as I stop.

Obviously I have a vacuum issue but I'm not certain where to go from here and am trying to minimize my mechanic call out bills. :)

Thanks in advance for any feedback/help.
  • Posted 19 Jan 2022 09:03
  • By PETER
  • joined 19 Jan'22 - 1 message
  • Alberta, Canada
- PETER
Showing items 1 - 2 of 2 results.
Hello Peter, control the governor. It's mounted below the carburator and it's got a 3 screws cover, inside there's a spring witch controls the maximum RPM. I think the spring is broken and the valve stays closed.
Regards
Marcb
  • Posted 22 Jan 2022 01:00
  • By marcb
  • joined 10 Jun'14 - 221 messages
  • ANTWERP, Belgium
I would look at carb make sure plunger inside is moving when cranking if stuck will not allow any propane to converter hope this helps
  • Posted 21 Jan 2022 02:47
  • By Scott_
  • joined 16 May'21 - 308 messages
  • Pennsylvania, United States
Scott

Post your Reply

Forkliftaction accepts no responsibility for forum content and requires forum participants to adhere to our rules of conduct. Click here for more information.

If you are having trouble using the Discussion Forums, please contact us for help.

Toplift Ferrari TFC36-48
Stoney Creek, Ontario, Canada
Used - Sale
USD1
Crown CG33P5
Braeside, Melbourne, Victoria, Australia
Hire
Latest job alerts …
Cleveland Ohio, United States
Columbia, SC, United States
Wentzville, MO, United States
Movers & Shakers
Laura Ness Owens Laura Ness Owens
Chief marketing officer, Bobcat Company
Chief commercial officer, Teradyne Robotics
CEO, MHEDA
President, European Rental Association (ERA)
Global Industry News
edition #1238 - 10 July 2025
This week Forkliftaction News is celebrating its 25th anniversary! A wonderful achievement given we launched at a time when just 6% of the world’s population were internet users, according to Internet World Stats . Over the coming weeks, we will be sharing stories about our history and rolling out more celebrations, so keep an eye out... Continue reading
UN Forklift FGL18T
HANGZHOU, Zhejiang, China
New - Sale
Mobicon 2T
Coraopolis, Pennsylvania, United States
New - Sale

Showcased in the Virtual Expo

Movers & Shakers
Laura Ness Owens Laura Ness Owens
Chief marketing officer, Bobcat Company
Chief commercial officer, Teradyne Robotics
CEO, MHEDA
President, European Rental Association (ERA)
Toyota 8FD35U
Flesherton, Ontario, Canada
Used - Sale
Ncn 85TH
Ncn 85TH 2014
Balling, Denmark
Used - Sale
Latest job alerts …
Columbia, SC, United States
Wentzville, MO, United States
Cleveland Ohio, United States
Fact of the week
The dot-com bubble, a period of large and rapid investments in internet-based companies, peaked in 2000 and saw the Nasdaq Composite index rise by 579%. Then the bubble imploded. As the value of tech stocks plummeted, cash-strapped internet start-ups became worthless and collapsed.