Skip the auto shop - Our mechanics make house calls

Q: About the governor in engine

asked by on

Hi....this is Shareef. I am studying engineering. Generally,governor is used to regulate the fuel supply of fuel to the engine.if speed increases the fuel supply is less.If speed reduces then supply may be high.actually,in automobiles have KMPL system, in kmpl system there should be rated economic speed,if speed more than that of economy reduces due to over speed.so from above we know that IF SPEED INCREASES THEN FUEL SUPPLY IS LESS. so how it is possible???

Hi there. Governors in a fuel system are basically a three-way valve. There is a supply port, exit port, and a dump port. As the fuel pressure regulator is set the fuel pressure will remain the same as when the fuel pressure regulator dumps fuel back into the return line to the fuel tank. If you were to close the gap to the dump port, then the fuel pressure will increase. If you were to open the fuel dump port, then the fuel pressure will be low.

When there is a demand of fuel, meaning the throttle is at wide open throttle (WOT), then the fuel pump will produce more flow and the regulator will adjust automatically either electronic or vacuum to decrease fuel pressure but increase the flow. It is like operating a water hose, crimp the end and have a slow spray to a distance away, but when you turn the valve on more, the pressure increases and the water sprays farther. You would have to let off some of the crimp to keep the water spraying in the same location where it was before.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car started making loud noise, oil changed prior to this

Hey there, thanks for writing in about your 2000 Saturn LS2. This can happen at times when the car has been sitting for a period of time. Hydraulic lifters help to operate the camshaft, which opens and closes the valves...

Q: My 2002 sliverrodo won't start turns over could the cold have gotten it

The fuel pump may not be turning over and providing pressure or enough pressure to the engine to get it started. The cold if extreme may be causing the pump to seize or freeze any water moisture that may be...

Q: Fuel Pump Malfunction

In October 2016, BMW announced a recall covering fuel pumps for certain models produced during model years 2007-2012. Your vehicle appears to be outside the scope of this recall but nevertheless it would be a good due diligence to contact...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.