where is all my gas going?

[XXX4life]

i have a 90 240 with a 91 ka24de that i just put in a few weeks ago, i put in 7.5 gallons of gas the other day and i've driven 65 miles and it's almost on empty? why am i only getting like 10mpg? it's got new plugs, cap, roto, wires, new fuel filter, new airfilter, what could it be?
thanks

[Shin_Kudo]

Never mind

[Flybert]

Leaky injectors, bad O2, fuel line leak, etc. Check your plugs and see what they look like.

[mistaanime]

put the KA24E engine back in there..lol...nah..i dunno..my guess would be bad o2..like flybert said..

[XXX4life]

Originally Posted by mistaanime

put the KA24E engine back in there..lol...nah..i dunno..my guess would be bad o2..like flybert said..

it was bad with the ka24e in too

[andrave]

fuel leak. der.

[XXX4life]

it's not a fuel leak, i would know if my fuel was leaking

[mbmbmb23]

Originally Posted by XXX4life

i have a 90 240 with a 91 ka24de that i just put in a few weeks ago, i put in 7.5 gallons of gas the other day and i've driven 65 miles and it's almost on empty? why am i only getting like 10mpg? it's got new plugs, cap, roto, wires, new fuel filter, new airfilter, what could it be?
thanks

Bad float sensor?

[weirdstyles.net]

stop beating it?

[idlafie]

You might want to check these threads....
http://www.zilvia.net/f/showthread.php?t=63587
http://www.zilvia.net/f/showthread.php?t=54065

If your going thru gasoline like there is no tomorrow then you might want to check your ECU first before you attempt any repairs. Put your ECU into Diagnostic Mode...see www.240sx.org FAQ page for instructions. Once you put your ECU into Diagnostic Mode, then check to see what type of Diagnostic Trouble Codes your car is kicking out.

Once you pull the Diagnostic Trouble Codes, then pop the hood of your car & try to figure out what may be causing your problem. Areas to check are.
1). Fuel Regulator....sufficient / not enough / too much vacuum going to the Fuel Regulator??
2). Fuel Injectors...is one or more leaking??
3). Engine Cooltant Temperature Sensor - a faulty ECTS or bad wire leading to your ECTS may have your ECU thinking your engine is still cold & causing the extra fuel to be dumped in your intake manifold.
4). Idle & Timing...check your Idle & Timing - make sure they are set properly
5). Oxygen sensor - test it thru the ECU..The Check Engine Light .should flash 5 times or more in a 10 second period when the ECU/O2 Sensors are placed into Diagnostic mode.
Check these items out & let us know what your results are..
Anyhow, hope this helps..
ID

[Blues13]

If the car is running fine and no signs of irregular conditions, then prob a fuel leak as suggested before. Did you check the ALL of the lines?? Sometimes its not so obvious, mine was a slow leak by the fuel tank under the car.. and ended up getting bout 14mpg.

[XXX4life]

we replaced all the fuel lines in the engine bay when we did the swap, but i will check the bad of the car, the full thing is i swapped a DOHC into my car b/c my SOHC was getting such bad milage and now i'm getting worse with the DOHC

[andrave]

yeah my infiniti was leaking at the injectors and it was getting horrible gas mileage and I didn't even realize it. glad I caught it and had the recall done before my car burned down.

[XXX4life]

is there a way to tell if my injectors are leaking?

[89s132b]

Originally Posted by XXX4life

is there a way to tell if my injectors are leaking?

Yes, unbolt the fuel rail and lift it out of the manifold. Keep all the fuel lines and injectors intact. Turn your key to the "on" position so that the fuel pump will prime. If you have leaky injectors, you will see fuel dribble out of the rail. If they DO leak, just change out the lower o-rings. I can send you some or you can buy some from your local nissan dealer for about $1 each. If they are leaky, I'd suggest replacing all the o-rings.