NO fix for Prius Gas Tank Filling Up Issues

Data would be helpful. On how many trips to a gas station has this happened? Have you tried different pumps at the same station? Is the pump set to fast or slow?

Granted, Toyota's response is infuriating BS but there are solutions if one looks for them here.

 

I think this is vastly over-stated. I've had the problem exactly once in 47 fill-ups. And yes I have the records to prove it.

 

Might be over-stated from your perspective and experience. But I know just what the OP is going through. My first ten fillups were hell. I was standing on my head, turning the nozzle upside-down (my best tip for a fix) and all sorts of gyrations. The craziest thing is that in the past year, I've simply had no issues, where previously I had nothing BUT issue. Maybe it has something to do with the fact that I don't buy gas anymore?

 

Even if you know the exact amount of fuel in the tank, how do you propose to know the number of miles till empty? With my Prius, the mileage normally varies between 46 and 57 mpg, with occasional excursions higher and lower. Let's say I know that I have 10 gallons of gas. With the normal variation in mileage, that could mean 460 miles until empty, or 570 miles until empty, or something in between. You will never know; there is just too much uncertainty. If it bothers you a lot, assume the lower number and you will never be disappointed.

Tom

 

The best answer seems to be:
1. Keep track of how much fuel you put in at the last fill-up
2. Reset the MFD MPG or l/100km calculator at each fillup (I've a 2005, so this is done for me)
3. Use (1) and (2) to calculate minimum range.

It takes a bit of attention, but it's really not that hard. Keep track of whether your driving style changes towards the end of the tank, and consider filling up every time you hit two pips. (2004-5 might get away with waiting until one pip, but they seem to have tightened that up on the 2006-2008 models.)

If that's not sufficient, then please do post more info. When you say you can't fill it up, how much *can* you add in? How many pips were lit on the guage when you tried to put that in?

My fills are typically between 8-9 gallons:
Gas Tank History

 

I wish I could help the OP, but perhaps the car does have a problem?

My 2008 doesn't seem to have this problem though.

In my truck and every other vehicle I've ever owned, I simply don't know how much actual gas is in the tank, as long as I fill up according to my preset decision which is not less than 1/8th tank according to the gas gauge and 2 pips (2/10ths) on the Prius.

I don't know maybe I'm missing the problem?

ZC1

 

The OP hasn't stated what they think a full tank holds. All they say is that they have a filling problem and " It is nearly impossible to get anywhere near a full tank..."

So here is a question for the OP: how much usable fuel do you think the Prius holds? I hope your answer isn't 11.9 gallons, because if it is, that's your problem. The gross capacity of the Prius is 11.9 gallons. With the North American models, which have the fuel bladder, the usable capacity is closer to 10 gallons. My typical fill up is about 8.5 gallons, when the gauge is down to one pip.

Tom

 

Heh... the only fix is to install a gas tank that doesn't have a bladder... perhaps import an European Prius?

 

I don't understand your problem at all. Maybe you can go back and try to describe what you are actually seeing.

You always know at a minimum how much fuel is in the tank, because you just put it there. You always know when the tank is getting low, because the last pip blinks and the MFD says add fuel. When the pip blinks, I fill it up. Due to the bladder this can be ~8-9.5 gallons depending on temperature, fill speed, pump sensitivity etc. I assume that there was no fuel left in the tank (even though I know there is some) and just calculate my range based on how much I actually put in at a reasonable mileage (~50mpg usually for me, maybe 48 on a road trip). Normally I just don't worry about it and just fill up when the pip starts blinking. If I need to estimate a partial tank, I calculate using 11 pips, as the Prius gauge seems to peg off the top for a pip or so (like most gas gauges). The variability is a minor nuisance but IMHO its a small price to pay for the vast improvement in evaporative emissions.

I'm not really sure what you are trying to accomplish by filling up at 1/2 tank or 200 miles. Has your car ever run out of gas with the gauge showing something more than empty? If so you either need you inclination sensors reset or your tank float replaced. If not, I'm not sure why you are so uncertain about how much gas you have.

I'm also not sure why everyone seems to think just because the Prius has a 10 bar gas gauge that its actually any more accurate than a traditional needle gauge. Last week on my subaru the fuel light came on even though I thought I still had 1/4 tank. My wife had run out of gas just after the light came on a year or so ago, so I went right in and filled it up. It only took ~10 gallons into a 16 gallon tank, so I tried to top it up and barfed gas all over the place. Starting the car up it read completely full. Thats the equivalent of a 7-10.75 gallon uncertainty in a Prius. On my Land Rover I used to see as much as an 1/8 tank change in the needle from parking it at night to starting it up the next morning. On the Land Rover I've had the tank range be anything from 250 to 330 miles (on 23 gallons of Premium, ouch!). Thats the equivalent of an 8-10.5 gallon variability in a Prius, and those vehicles don't have the added complexity of the bladder to deal with.

Rob

 

What the OP describes happened to me several times (maybe 4-5 times out of 137 fill-ups), but I know, more or less, how much should go in, so I just manually fill very slowly until the nozzle clicks off. I've never spilled gas doing this and the car has never barfed gas.

I'm not sure the criticality of the numbers for the OP unless gas will be unavailable and fill-ups must be planned. The tank's either full or it's not.

 

I don't have any issues with the tank so far, I have owned the car for almost 2 months now and I think the most I ever put in was 8 gallons when it was down to 2 pips.

I don't know if you can ever really know how much a gas tank holds. I just recently found out that my traded in SUV, the Saturn VUE is supposed to hold 16 gallons of gas. Well, in the 3 years that I owned that SUV, the most I was ever able to put into that tank was 12 gallons, and that was when the gas gauge was down to empty and the light was blinking. I don't think the SUV holds 4 gallon reserve when your light start blinking telling you you are almost empty.... So, I don't know how much my VUE tank ever really held. I know for certain I was never able to put more than 12 gallons in.

But why should this issue with the Prius tank be such an issue?, I just don't get it, I fill my tank when the gas gauge tells me the tank is low, I know to fill it around 2 pips, so are there people that only fill their tank according to their mileage??, I don't, I watch the gas gauge and when it gets low, I fill it up.. I have never heard of anyone running out of gas at 2 or 3 pips. So just fill it up when it reaches that point. What does it matter really if the tank holds 11.9 gallons or only 7 gallons of gas, as long as the gas gauge appears to be working properly and goes down from 10 pips to 2 pips or 1 pip, that should be enough warning to fill the tank when the pips get too low.

I'm just not understanding why some have such a problem with this? Just fill up when the pips get low,, it is not like there is no gas gauge or are people just trying to say that they don't have to fill up for a month? I don't think too many of us live in such a rural area that it would be over 50 miles or so to a gas station and I don't think that the gas gauge works that badly that you would have to worry about registering a half tank and then no gas within a 50 mile radius.

 

Just learn to live with it and enjoy the other 200 good features of the car. Nothing is perfect. It is a good thing that many are making Toyota aware of their dissatisfaction with this problem. They have known about it before the 04 model hit the streets. Maybe they will make a major change in the 2010 model.

 

A good estimate of partial filling is to compare the computer mpg since the last fillup with the calculated mpg based on the trip odometer and gallons filled. My first fillup on the car at 150 miles, the computer read 48 mpg vs the calculated 65 mpg. Assuming the computer was correct, the tank was .8 gallons short of fillup due to the bladder? Maybe. But maybe the dealer filled the tank more than I did using the auto-stop on gas pump. We'll see what happens next fillup.

 

Sorry to hear you've had so much trouble. That happened to me once at a Sam's Club gas station. I could only add 7 gallons, so I checked another pump. Same story. So I drove down the street and added the final two gallons from another station. I chalked it up to wierd pumps, but the last time I went to Sam's for gas, it didn't happen... I'll open an X-File on that one, I guess...

 

One might not live in such a rural area, but I (for one) often drive through them. Knowing whether I've got 50 more miles in the tank, or 200, can make a difference in how often I stop -- and every stop does take extra time and MPG hit. (Not as much time as running out of gas in the middle of nowhere, granted, but there have been more than a few times I've wanted a reliable "miles remaining" calculation on the Prius.)

 

I have a new 08 and have had this issue a couple of times. From what I can tell, for me, it has to do with the filling station and the speed at which the tank is filled.