P0452 Error Code

[Spellino]

Getting this error and other pending on my 07 Yaris Sedan. The error goes off usually after the first bar drops on the fuel guage. Also, when I'm buying fuel, the last 5 litres are painfully slow.

I would be glad if anyone could assist with how to correct this? Or at least an idea of what is happening?

[dogsridewith]

"painfully slow"
The filler handle keeps clicking off?
You have to squeeze handle just a tiny bit or fuel spills down the side of the car?

(not supposed to fill after the pump clicks off. Needs to be vapor space in top of tank for vent lines and evap system to work. Read owner's manual.)

[06YarisRS]

(not supposed to fill after the pump clicks off. Needs to be vapor space in top of tank for vent lines and evap system to work. Read owner's manual.)

Not that this is necessarily what the OP is doing, but I can confirm this is a no no. Before I was aware of this, I ruined a charcoal canister on the evap system of my Dodge grand Caravan; saturating it in gas. I cringe when I see people - a lot of them - doing this at gas stations, especially since replacing a canister can be so expensive and sometimes a lot of shop hours to pinpoint the actual evap issue.

[dogsridewith]

Getting this error and other pending on my 07 Yaris Sedan. The error goes off usually after the first bar drops on the fuel guage. Also, when I'm buying fuel, the last 5 litres are painfully slow.

I would be glad if anyone could assist with how to correct this? Or at least an idea of what is happening?
Spellino: Favor to ask:

If overfilling has been the problem and all error codes go away simply w/ first click-off fills, kindly let us know here on YarisWorld. (Or what it does take to resolve the problem) Among other things, it would be good to know how robust our evap systems are.

Good luck and many thanks.

[Spellino]

"painfully slow"
The filler handle keeps clicking off?
You have to squeeze handle just a tiny bit or fuel spills down the side of the car?

(not supposed to fill after the pump clicks off. Needs to be vapor space in top of tank for vent lines and evap system to work. Read owner's manual.)

Sorry but I have been away from internet for the past 5 days. While filling at the station, it keeps clicking off. So the guys at the station call mine a slow tank. So they always have to do exactly as you described. What happens is that at the very last 5 litres, it takes an even longer period to fill the tank.

What do you suggest I do?

[dogsridewith]

Don't put in those last 5 litres.
(When were you finally stopping? When gasoline became visible in the filler neck?)

(Before the last 5 litres, the always "slow tank" could have something to do with something wrong with the vent pipe--skinny pipe next to the fill pipe. I think more likely something w/ the station pump's shutoff system.)

[06YarisRS]

This may be helpful, though maybe you've already seen it:

http://www.yarisworld.com/forums/showthread.php?t=40581

[Spellino]

This may be helpful, though maybe you've already seen it:

http://www.yarisworld.com/forums/showthread.php?t=40581

Thank you. I think some of the suggestions there will help. I will have to look at it then and get back to you.

[dogsridewith]

A lot of bad/wrong explanations in that thread, but some good. I never heard of the rollover valve and am really glad to know now!
My own feeling at this point is that problems with the roll over valve or the vent pipe along the filler pipe are what can cause "slow fill." That tank fill-ups don't vent through the EVAP system. And overfilling will hurt the EVAP system. And having to dribble-fill a "slow tank" leads people to overfilling.

[Spellino]

A lot of bad/wrong explanations in that thread, but some good. I never heard of the rollover valve and am really glad to know now!
My own feeling at this point is that problems with the roll over valve or the vent pipe along the filler pipe are what can cause "slow fill." That tank fill-ups don't vent through the EVAP system. And overfilling will hurt the EVAP system. And having to dribble-fill a "slow tank" leads people to overfilling.

Wait. So where can I locate those two valves?

[Spellino]

Don't put in those last 5 litres.
(When were you finally stopping? When gasoline became visible in the filler neck?)

(Before the last 5 litres, the always "slow tank" could have something to do with something wrong with the vent pipe--skinny pipe next to the fill pipe. I think more likely something w/ the station pump's shutoff system.)

It's always in the filler neck immediately they start dispensing fuel. So they have be doing it patiently to not spill out fuel.

[dogsridewith]

Wait. So where can I locate those two valves?
What two valves? The only valve I've mentioned here is the rollover valve, which I didn't even know existed until this thread. Sounds like it is in the vicinity of where the filler pipe meets the fuel tank. If it was stuck closed, or near so, fuel would obviously back up in the filler pipe during fills.

[dogsridewith]

It's always in the filler neck immediately they start dispensing fuel. So they have be doing it patiently to not spill out fuel.
Have you stopped putting in the last 5 liters? Did any of the error codes turn off?

[Spellino]

Have you stopped putting in the last 5 liters? Did any of the error codes turn off?

I have ,on the last three fill ups, the codes are still showing up though. They do go off after driving for some time though

[Spellino]

What two valves? The only valve I've mentioned here is the rollover valve, which I didn't even know existed until this thread. Sounds like it is in the vicinity of where the filler pipe meets the fuel tank. If it was stuck closed, or near so, fuel would obviously back up in the filler pipe during fills.

Okay, thank you

[dogsridewith]

Some cars had flaps near the top of the filler pipe that the spout of the station pump filler handle opened when inserted. This flap was a sort of check valve, which may have been mentioned somewhere in another linked thread.

Something is amiss and causing the slow fill.

If the codes go off after "driving some time," how about noting how many bars are showing on the fuel gauge and just filling to there on the next fill? There needs to be space in the top of the tank w/o fuel. Maybe more space than 5L.

[Spellino]

Some cars had flaps near the top of the filler pipe that the spout of the station pump filler handle opened when inserted. This flap was a sort of check valve, which may have been mentioned somewhere in another linked thread.

Something is amiss and causing the slow fill.

If the codes go off after "driving some time," how about noting how many bars are showing on the fuel gauge and just filling to there on the next fill? There needs to be space in the top of the tank w/o fuel. Maybe more space than 5L.

I don't see a flap there. There is a tiny hole I see that seem to be the mouth of a thin pipe that runs along the filler hose to the tank.

[Spellino]

Yesterday I took off the filler tube at the tank. I inspected the tube and it didn't appear to have any thin in there blocking the fuel. I put my finger inside the tank k through where the tube meets the tank. I felt some resistance, like a plastic with a spring. I couldn't fully push it so I tried to do that with a long screw driver. However it wouldn't change its position. It would appear to be pushing in and came right back to the initial position. There was a gap under it though so I suspect there's nothing wrong there. I'm so confused and don't know what else to do.

[Spellino]

Spellino: Favor to ask:

If overfilling has been the problem and all error codes go away simply w/ first click-off fills, kindly let us know here on YarisWorld. (Or what it does take to resolve the problem) Among other things, it would be good to know how robust our evap systems are.

Good luck and many thanks.

So I think it might it be fixed.

1st I checked the filler tube, it was clean. Then I checked the thin tube that runs from the tank, by the filler tube and ends with an opening near the filler tube opening. I could blow air into that as well.

Then I took off the tube that connect to the cannister from the top of the fuel pump at the end leading to the canister, closed the filler with the cap. Then after a while I opened the cap but there was no gush of pressurised air coming out. Before I took the tube that connects to the cannister, it would come out through the filler tube.

Finally, I took out the tube that end just below the filler tube the medium sized one of the three pipes or tubes. It had a lot of clay that had turned solid in it. I cleaned it up and put it back.

I haven't tested the slow nature of the gas fill up, but the check light hasn't come up again. I'm going to wait a few more days and check on that as well.

[dogsridewith]

Wow. Good to hear. I got distracted talking taillights, but was going to mention the various little insects that build mud nests and cocoons in the orifices of metal machines.
Anything partially disassembled, or used parts, could get plugged...some running things w/ vents to atmosphere too.

[Spellino]

Wow. Good to hear. I got distracted talking taillights, but was going to mention the various little insects that build mud nests and cocoons in the orifices of metal machines.
Anything partially disassembled, or used parts, could get plugged...some running things w/ vents to atmosphere too.

A little update. I went to the fuel station yesterday. Attendant was hesitant to lock the nozzle in since he knew my car's problems. However, the fuel went in pretty quickly to his surprise. My fuel gauge was just on the 4th bar when I refuelled and after about 19 litres, the fuel gushed out. Was it at the point the nozzle would have clicked if the attendant had locked in the nozzle? How does refueling work? This is my first year with my first car so forgive my ignorance

[dogsridewith]

Did it click off in the attendant's hand when it gushed out? If not, there's something really wrong with the filling station pump.

(I find too much variability in pump behavior. Some click off at obvious short fills. Some have clogged filters or something and take minutes to fill. Some are obviously super pumpers and click off w/ a spritz of fuel out the filler neck. Some correctly click off w/ no drama and no gas burp when the tank is full.)

[Spellino]

Did it click off in the attendant's hand when it gushed out? If not, there's something really wrong with the filling station pump.

(I find too much variability in pump behavior. Some click off at obvious short fills. Some have clogged filters or something and take minutes to fill. Some are obviously super pumpers and click of w/ a spritz out the filler neck. Some correctly click off w/ no drama and no gas burp when the tank is full.)

Yeah I think it did but he was still pumping manually

[WeeYari]

If attendant ignored first click shutoff, then he was an idiot.

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