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A malfunctioning oxygen sensor: The oxygen sensor measures the amount of oxygen in the exhaust and sends this information to the engine control module. If the oxygen sensor is faulty, the engine may run too rich or too lean, which can result in excessive fuel consumption.
A clogged air filter: A clogged air filter can restrict airflow to the engine, causing it to work harder and use more fuel.
A faulty fuel pump: If the fuel pump is not working properly, it may not be delivering an adequate supply of fuel to the engine, causing it to consume more fuel in order to compensate.
A leaking fuel injector: A leaking fuel injector can allow fuel to escape from the engine, leading to an increase in fuel consumption.
To determine the cause of the excessive fuel consumption in your Mazda Demio, it is best to have it diagnosed by a mechanic. They will be able to perform tests and inspections to identify the problem and suggest the appropriate repairs.
Change spark plugs, run fuel injector cleaner {(concentrated) in every tank of fuel until engine run more efficiently, change air filter.
Inflate tires 2 pounds more than recommended.
Remove all extra material and items stored in car.
I am not familiar with this car, but most newer cars have it located in the fuel tank. However, I hear that some Mazdas have it located under the back seat and then remove a small panel. That would be where I'd start looking. I hope this helps you.
The fuel pump is in the fuel tank. You may be able to access the fuel tank by removing your bottom rear seat cushion. If no access there you must remove the fuel tank. If you have to remove the tank and it is mostly full you should siphon out as much fuel as you can into appropriate containers.
fuel pump located inside petrol tank,
you have to remove the fuel tank, only 4 bolts, and a few pipes.
befor doing so, check fuel pump relay located in the middle of dashboard on the floor(horse shoe type plastic cover)
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