View Full Version : Fuel Tank Capacity Question

07-16-2003, 10:54 PM
I filled up the '89 SC today with 19.5 gallons. The tank was very low, but I was sure that it had a little more in the reservoir. My question, is the 19.0 gallons listed in the manual accurate, or should I go back to the station and ask for some of my money back since the pump is off?


James Kanteraki
07-17-2003, 02:51 AM
i don't know,

i've got a 92 which is supposed to have an 18 gallon capacity. the longer i own the car the more gas it holds.

last week the light wasn't on, nor was the guage way over in the red and i put like 18.2 gallons in. i had gone about 340 miles on the tank which is about normal for me before the light comes on, but for the guage which i never trust and for the light be wrong just seems odd.

i think the gas companies are screwing us again. and the prices are still high. damn it


07-17-2003, 08:38 AM
fluid density changes with temperature, so the fluid may retract or expand as it enters your gas tank, I dont know if it expains this situation, but something to think about

07-18-2003, 03:17 PM
I remember that on the fox-body tbirds you could put on a "shorter neck" which increased the capacity of the fuel tank. Perhaps their is 1/2 gallon in the neck that doesn't count as 'fuel-tank' capacity?


07-18-2003, 04:37 PM
340 miles on a tank of gas! Is that normal. I usually drive reasonably, but I get about 250 miles on a tank of gas in my 90 SC. I drive about a 60/40 highway and city.

07-18-2003, 05:44 PM
OK I just did a search on the topic and found that some people get poor gas mileage just like me :(. Ifm going to check my O2 sensors! Since my SC is stock, I would like to get at least 300-320 on a tank of gas. Unless Ifm having fun :)

07-19-2003, 02:29 AM
I'm pretty sure I was running on fumes at the time. :p

As far as mileage; I did a 'round trip to Vegas (478 miles @ 80mph) and the check gauge light (less than 2 Gal left) hadn't come on yet. ;)


07-19-2003, 04:24 PM
That is not what I wanted to hear! :eek: It makes the problem seem worse, not better. I need to run the codes on my car and see what comes up. I will fix the problen AND get better mpg!

07-19-2003, 08:42 PM
I feel better knowing that someone else got at 19.2 in their tank.

As far as the gas range, I think some of it is related to which rear end you've got. I've owned my stock 89 5spd. SC since new and the 2.73 rear end still gets me around 26-27 driving 80 mph on freeway trips.


07-19-2003, 09:06 PM
My car is BONE STOCK! It should get better mpg!

Theoretically, a car should be more efficient with a different intake, camshaft, and exhaust, but I should still get more than 250 on a tank. I always felt that was a little short. I just thought it was because of my massive horsepower.:D