Where is my gas going?!?!?!?

[stanger]

Ok, amoung other problems my current issue is my car is only getting about 220 miles to a tank of fuel!!! It was much better before I installed the o/r h pipe. I do not have MIL eliminators as the used h pipe that I bought had the holes in it for the O2 sensors so they were installed. It has a new fuel filter, spark plugs, CAI, EGR. I also cleaned the IAC and it just seems to be getting worse with every fill up. I am running sea foam through it right now so would that make it use more fuel? Any suggestions are appreciated guys. $40 a week in fuel is killing me right now. Thanks to everyone. :BangHead:

 

[bryand]

wow, my stangs get 160 out of a tank, id be happy with 220, now i feel bad

 

[duff daddy]

I get about 300 to mine. Is there any leaks? Check engine light on??

 

[bryand]

^^^DAMN, im going to have to look at my stuff

 

[MustangChris]

I get about 300 to mine. Is there any leaks? Check engine light on??

me too... roughly 315 mixed.

I honestly think it might be due to the lack of cats, but thats an expensive fix if im wrong. lol.

 

[Javi]

geez, i used to fill up every other day, about $48

 

[bryand]

id be so happy with 300, i might accually drive the things if i could get that

 

[BII302]

Check the rubber piece that connects the fill neck to the gas tank. Mine dry rotted once and was leaking a decent amount of fuel everytime i turned. Couldn't figure out wtf was going on till i noticed fuel leaking onto the ground when i was filling up one day.

 

[bryand]

i will do^^

 

[MustangChris]

ha, good point... mine did that too... very common problem on SN95s... good idea bro.

 

[98GTnSC]

yeh i get about 290-300 if i drive right

 

[98GTnSC]

but what would having an O/R midpipe have 2 do with that?

 

[MustangChris]

but what would having an O/R midpipe have 2 do with that?

nothing... hes jsut saying that it could be a different cause to the same problem.

 

[Mean98GT]

+1 on the dry rotted rubber piece. Left turns would cause me to dump a decent amount of fuel. And if I filled up all the way it would leak all the time.

 

[MustangChris]

be aware that you have to drop the tank to replace the rubber seal on the fill tube, so avoid fill-ups until you can rule that out, or fix it.

 

[96redgt]

^^^ Not exactly true. Its a pain in the ***, but you can replace it with the tank still on the car. I did. Took a while, but I did. I did have to loosen the straps a little, but not completely drop it.

 

[stanger]

Thanks guys and for the outside correspondence Chris. I will definitely check the fill tube seal as soon as this rain stops. 4" in two days doesn't do a leaking convertible top that needs to be replaced any good! Thanks again.

 

[GDTrumbo]

I get about 300 to mine. Is there any leaks? Check engine light on??

OP. If you are getting a CEL, which by all account you should be, the PCM is always "open" loop. This alone will drop your fuel mileage as all
of the pertinent sensors are turned off.

GT

 

[stanger]

My CEL comes on every night and usually goes off sometime during the day. I am currently getting the code P1443 and will be cleaning the valve this weekend as well as checking for the dryrotted fuel fill seal. I am currently running sea foam through the fuel tank, will that make it burn fuel faster?

 

[Javi]

canister purge sensor?
purge flow sensor?