Discussion:
Aisan regulators

I am wanting to learn more about Aisan regulators, particularly the area at the top that has either an electrical solenoid, OR in my case, a vacuum line that seems to want a source of vacuum immediately on start up. I believe Toyota refers to this as the "Slow Solenoid" and Hyster manuals refer to this as the "Idle Bypass Solenoid".

What is the purpose of this solenoid? Is it supposed to give more LPG during cranking?
  • Posted 6 Jun 2025 13:17
  • By Rocky_Slater
  • joined 12 Jun'23 - 11 messages
  • Virginia, United States
Showing items 1 - 2 of 2 results.
Im not sure of the age of it. Though it does have an LPG lock off solenoid down at the bottom that looks like a black cylinder. I had a truck that would start and run but would slowly decrease idle and die. Found that a vacuum needs to be drawn on this hose at start up to run.
  • Posted 7 Jun 2025 16:01
  • By Rocky_Slater
  • joined 12 Jun'23 - 11 messages
  • Virginia, United States
if it's a real old one it's a vacuum lock off valve. The newer ones have the solenoid and the slow path hose that supply's fuel to the injector.
  • Posted 6 Jun 2025 20:22
  • By Fritzthecat
  • joined 20 Oct'23 - 20 messages
  • Connecticut, United States
Be nice to forky

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.

UN Forklift FD50T-NJB3
HANGZHOU, Zhejiang, China
New - Sale
UN Forklift FBR25NQC3
HANGZHOU, Zhejiang, China
New - Sale
Upcoming industry events …
October 29-31, 2025 - Marina Bay Sands, Singapore
November 26-27, 2025 - Budapest, Hungary
April 8-10, 2026 - Jiangsu Province, China
Latest job alerts …
Atlanta Savannah Orlando Tampa Jacksonville West Palm, United States
Ottumwa, IA, United States
St. Louis, MO, United States
Movers & Shakers
Dwight Klappich Dwight Klappich
Strategic advisor, Roboteon
CEO Americas, Hai Robotics
Executive director, NT WorkSafe
Chief executive, Logistics UK
UN Forklift FD50T-NJB3
HANGZHOU, Zhejiang, China
New - Sale
UN Forklift FBR25NQC3
HANGZHOU, Zhejiang, China
New - Sale

PREMIUM business

RAEDER-VOGEL
Innovative high-quality wheels and castors for the forklift industry.
Movers & Shakers
Dwight Klappich Dwight Klappich
Strategic advisor, Roboteon
CEO Americas, Hai Robotics
Executive director, NT WorkSafe
Chief executive, Logistics UK