5.0stang123

I used to get 320-380 km to a tank and now I have used almost half a tank and went only 61km! Thats sooo bad. Car seems to run strong and I havent made any changes. I just bough a k and n filter 2 months ago. O2 sensors and cap n rotor are new too. I also did pcv valve and the original owner did fuel filter, sparkplugs, and wires before he sold it to me which was not even 2 years ago.

Mustang Boy

ok idk if this is the cause or not but the fuel filter should be replace about ever 15-30K miles(dont know the kilometers conversion sorry) so im betting if you take that fuel filter off you will see some nasty dirty fuel coming out of the inlet side of the fuel filter

5.0stang123

Ya but it hasnt even been 10k km since it was done, maybe ill do it anyway, how do you replace it?

67mustang302

How do you know it's using that much fuel? Did you refill the tank and figure based on the gallons/liters it took to fill it up, or are you just looking at the stock gauge?

5.0stang123

Ya I havent gone through the whole tank yet but usually at the point it is now its usually way higher. I always fill it right fuill then run it to empty for a while, I dont have a low fuel light so Its kinda sketchy.

67mustang302

Have you filled it up all the way, driven it a known distance, then filled it upp all the way again, to see how much fuel it's actually using?

Mustang Boy

oh i had assumed that you had been driving it pretty regularly in the 2yrs since the PO put the fuel filter in with only 10k you should be fine for another year with the way you drive it lol

rmodel65

i get 300-350miles from a tank normally

Styg

Fuel filter is very easy to replace. It is right behind the fuel tank assembly under the car. It is held in place with one band clamp. Takes about 10 minutes to replace.

5.0stang123

Ya I am stumped though, what are things that cause poor milage, I know fuel fiilter and 02 sensors have a good impact but those are both replaced recently. Do spark plugs have an impact on milage? How long do they last for usually, mine were done about 2 years ago.