Q: Fuel consumption is high

asked by on

I have replaced the plugs, airfilter, and done a carburettor tuneup with a new carburettor kit, but it still does between 8 to 8.5 km/l on an average. What do i do get a better fuel consumption. I hear this vehicle should do at least 12 km/l.

My car has 5 miles.
My car has a manual transmission.

Hi and thanks for your question. In order to have a good fuel consumption, the fuel to air mixture must be around 14.7 to 1. This is the formula for the air to fuel ratio. Look at the carburetor for any restrictions or leaking fuel. Check the adjustments for that the fuel is about half way and that the air is half way. This will allow the fuel to enter with the proper amount of air into the carburetor.

Also, check to see if there is a vacuum leak on the engine. Take a vacuum gauge and hook it up to the manifold and run the engine at idle. There should be 12 hg of vacuum or more on the gauge to make the engine run. 19 hg to 21 hg is a good vacuum reading that shows the right amount of air being entered into the engine. If you have low vacuum, there could be a vacuum leak or the carburetor may need adjustments.

If you need assistance in troubleshooting your engine, then seek out a professional, preferably a professional from YourMechanic to properly diagnose your car’s high fuel consumption.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Fuel consumption is high

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: Engine stutters

It is possible that your engine could have a fuel issue of some kind. Considering that it is a hybrid, I would not overlook they electric motor for issues during this diagnosis. I would first recommend having your vehicle scanned...

Q: Car jerking often, check engine light flashed and stayed on.

What you are describing sounds like a dirty or faulty mass air flow sensor. The mass air flow sensor monitors air intake as it is mixed with fuel prior to being injected into the motor. This sensor relays vital information...

Q: Can I put E85 in my gas tank?

If the previous owner specifically asked you not to, they may have known about an issues the vehicle has when using E85. It may be necessary to visit your local dealer to take a look at the truck to see...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...