BMW E46 318i Fuel consumption problem it is apparently using 1 mile of fuel every 100 meters. BMW E46 318i

fill your tank up, wright down how much, write down the milage, ride it until almost empty, fill it up again, figure up how much fuel was used, find out how many miles you have gone on that tank full and divide it into the amount of gas used. Mileage into fuel.

when you say it seems to be using too much, that is just a feeling
what you have to do is fill it right up and press the trip meter on the speedo
then you drive/use the vehicle normally until you are around 1/4 tank on the gauge
fill it right up again and record the reading on the trip meter
reset the trip meter and use normally again
repeat the process say for 4 tank fills recording each trip distance
then you will see what the fuel consumption is for example 40 liters for 400 klms is 10 liters per 100 klms or 20 galls for 200 miles is 10 gallons per 100 miles
the requirement to record distance and fuel put in will give you an accurate consumption over traffic, driving and atmospheric conditions from there you can ask --is this consumption figure around right for the car?

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There most likely isn't a problem. The fuel gauge works off of a reisistor board that's mounted on the fuel pump assembly. There is a arm with a float attached to one end. On the other end there are needles that touch the resistor board. The float level changes where the needles touch the risistor board and that changes your fuel gauge. Not all resistor boards read exactly the same, especially if an AC Delco pump wasn't used. The gauge is just reading off a little bit compared to your original one. Try filling up, resetting your trip meter and then driving a good bit. When you fill up the next time figure your gas mileage by dividing the miles you went by how many gallons you used. I bet your still getting around the same gas mileage.

theres two plugs on the fuel pump. one is for pump and one is for gauge if you take pump out of tank and put a volt meter on the two outer prongs in plug then the two inner two of them will read the same when yoou move the level up and down and when you put meter on other two it will change when you move level or the level part of pump isnt working correctly. my old tahoe did that and when it would get to a 1/4 of a tank i knew it was almost out of gas.

The sending unit in the tank is bad or is not positioned properly.

There is nothing else to replace ... presuming you did everything correctly and the replacement parts were not faulty, I suggest you live with it. Keep track of the miles you drive and fill up when you have driven about 1/2 the estimated miles per tank for best results. I.E.: you get 10 MPG - your tank is 20 gallons = 200 miles per tank ... fill up every 100 or so miles.

OR

You could take it to the BMW place and let them fix it.

Thanks for your question @ FixYa.com

it has gotta be the o2 sensor, map sensor, or the mass air flow meter.............. these are the main inputs to the computer that controls the fuel control....let me know how that works out please

change o2 sensors every 60,000 miles and use iridium plugs they will outlast engine.
check engine light will not come on until sensors are completely shot,this also goes for your mass air flow,had same issues with 99 beetle happened at 80,000 miles,changed all three items ended up with 35mpg after getting 24mpg before fix.parts are cheap on ebay.

Hi,
The meter works with the rpm and the angle the throttle opens. In simple language...the more you press on the gas pedal the more it uses fuel.
The point at which fuel is efficiently used is when you are in higher gears at low revs.
Let us know if this answer makes sense to you.
Cheers.