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Old 04-17-2014, 06:01 PM   #1
06AWD
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Default Gas gauge dropping very quickly

Forgive the poor description in the title of this thread. I'm perplexed.

2011 STI
Stock

I get gas at the same gas station every week. I generally get around 300 miles to a tank and 19.8 mpg. I drive the same route to work and back each day. Highway, 75 mph.

Got gas last night. 14 gallons went in. Drove to work this morning and had already burned 1/4 tank. Got home and I've used nearly half a tank on 46 miles. I'm can usually go 100 miles or so on a 1/4 tank.

I checked for gas leaks under the car. Nothing. MPG is still 19.8. Car runs fine. No lights on the dash. Gas cap is tight. No other issues.

Any ideas? I'm lost.

[IMG]2014-04-17 17.42.07 by nickchristoff, on Flickr[/IMG]
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Old 04-17-2014, 07:23 PM   #2
JonnyV2889
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Go top off to see what you're actually getting. Maybe you didn't top off last time?
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Old 04-17-2014, 10:13 PM   #3
Scoobiesdoobies
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Yea what he said. One time I sat there and filled suuuuuuuper slow and just feathered the pump nozzle til it wouldnt fill between clicks anymore.

My gas gauge never goes to the top and that made it fill all the way. Filled up again today and didnt top off and it was halfway between 3/4 and full.

Try filling up when its cooler too you get a tad more gas.
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Old 04-17-2014, 11:00 PM   #4
microsnook
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It could be the fuel sender
I'm having this issue as well. 06 STI
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Old 04-17-2014, 11:14 PM   #5
06AWD
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Thanks for the replies. What does the fuel sender do, besides the obvious?

Also, when I got gas, the had gauge registered as full. It just went down very very quickly. The level dropped consistently, too.
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Old 04-17-2014, 11:25 PM   #6
06AWD
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I guess my question is if I'm getting a false reading of how much gas is in the car, or if the car is using the gas at an exponential rate. As I said, I'm still getting the same mpg as before.
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Old 04-17-2014, 11:29 PM   #7
Amazing Asian
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Do a true MPG calculation on your next fill up, not the one the car tells you.
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Old 04-17-2014, 11:39 PM   #8
Scoobiesdoobies
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Quote:
Originally Posted by Amazing Asian View Post
Do a true MPG calculation on your next fill up, not the one the car tells you.
Ohhhhhhh. Now I get it. The mpg you are giving us is your computers calculation.

Yea dude best to do it by hand.

Fill up all the way, zero trip meter and drive until you are ready to fill up again.

After you fill all the way back up to the top, take the amount of miles on the trip counter and divide that by how many gallons you just put in the tank.

Then zero again and compare the next reading.

Mine can be all the way from 15-16 to 22mpg depending on if im commuting to work or driving around town like an *******.

Should give you an average mpg on 1 tank of gas pending driving habits.
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Old 04-18-2014, 09:06 AM   #9
06AWD
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Watched my gas gauge drop another 1/12th on the way to work today after driving only 20 miles.

I'll fill up when this tank is empty (or at least registers as empty) and then calculate the actual average mpg. I wish I would look inside the tank to see if there's actual gas in there or just a bunch of air. I did notice that when filling up last, all 14 gallons went in in under a minute. That's super quick compared to other gas stations in my area. Usually it takes several minutes to fill up from empty. Could the force of gas flying into the tank screw anything up?
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Old 04-18-2014, 11:01 AM   #10
Scoobiesdoobies
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Quote:
Originally Posted by 06AWD View Post
Watched my gas gauge drop another 1/12th on the way to work today after driving only 20 miles.

I'll fill up when this tank is empty (or at least registers as empty) and then calculate the actual average mpg. I wish I would look inside the tank to see if there's actual gas in there or just a bunch of air. I did notice that when filling up last, all 14 gallons went in in under a minute. That's super quick compared to other gas stations in my area. Usually it takes several minutes to fill up from empty. Could the force of gas flying into the tank screw anything up?
Could have been a bad pump last time too. 14 gallons takes several minutes even on a high speed pump. Sounds like the gas station jipped you. I usually dont freak out about something like that unless its doing it from now on......instead of just a one time occurance.
One time I turned down a street and started to drive 5mph the car started sputtering and shaking violently....I startes getting scared then it stopped......never happened again......

Cars are weird man lol
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