YARIS 1.3 Vaccum from EVAP line - Toyota Yaris Forums

mik36 · 11-29-2023, 03:54 PM

Gents

I had this strange issue in 1.3 petrol engine the evap line I can feel have a high pressure vacuum
When I open the tank cap I feel hissing noise feel pressure released
Is this normal
I was looking at the evap purge valve which has one line from fuel tank evap this line has got vaccum in it and when I removed the finder the rpm increases this line connected to black pipe in the valve there is grey one from this valve which i believe goes into engine

No codes.
When I remove my finger from evap line the rpm increases and LTFT jumped to 9
Any help to test cross check would be highly appreciated

komichal · 11-30-2023, 09:39 AM

Whenever I remove the tank cap I actually do not hear hissing. I hear clapping as there is negative pressure in the tank that sucks air from outside and I guess there is some protective shutter that that makes the clapping.

Driving Yaris 2007 hatchback with 2SZFE 1.3 engine. Bought it in 2012, always behaves like that, never threw a code, never had any problem with this.

Compeer · 12-01-2023, 01:09 AM

Quote:

Originally Posted by mik36

Gents

I had this strange issue in 1.3 petrol engine the evap line I can feel have a high pressure vacuum
When I open the tank cap I feel hissing noise feel pressure released
Is this normal
I was looking at the evap purge valve which has one line from fuel tank evap this line has got vaccum in it and when I removed the finder the rpm increases this line connected to black pipe in the valve there is grey one from this valve which i believe goes into engine

No codes.
When I remove my finger from evap line the rpm increases and LTFT jumped to 9
Any help to test cross check would be highly appreciated

Normal, all my toyotas hissed like theirs vacume in fuel tank when i get gas, current yaris does it too. never ran it without cap on to notice any change,

zoidberg444 · 12-07-2023, 02:31 AM

Whenever I take the fuel cap off mine it always hisses as air rushes into the tank. I always assumed the EVAP system kept the tank under vacuum in order to draw petrol vapours from the tank into the intake to prevent them off gassing to atmosphere.

11-29-2023, 03:54 PM	#1
mik36 Drives: VERSO S Join Date: Jul 2021 Location: Bromsgrove Posts: 39	YARIS 1.3 Vaccum from EVAP line Gents I had this strange issue in 1.3 petrol engine the evap line I can feel have a high pressure vacuum When I open the tank cap I feel hissing noise feel pressure released Is this normal I was looking at the evap purge valve which has one line from fuel tank evap this line has got vaccum in it and when I removed the finder the rpm increases this line connected to black pipe in the valve there is grey one from this valve which i believe goes into engine No codes. When I remove my finger from evap line the rpm increases and LTFT jumped to 9 Any help to test cross check would be highly appreciated

12-07-2023, 02:31 AM	#4
zoidberg444 Drives: Yaris 06 - 5dr hatchback Join Date: Aug 2015 Location: Birmingham, UK Posts: 390	Whenever I take the fuel cap off mine it always hisses as air rushes into the tank. I always assumed the EVAP system kept the tank under vacuum in order to draw petrol vapours from the tank into the intake to prevent them off gassing to atmosphere. __________________ - Yaris 2006, 1.0, 5 door hatchback "Betty" - 240,000 miles UK to Nordkapp in a Yaris

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11-30-2023, 09:39 AM	#2
komichal View User's Garage Drives: Yaris 2007 1.3 2SZFE 64kW Join Date: May 2012 Location: CZ Posts: 297	Whenever I remove the tank cap I actually do not hear hissing. I hear clapping as there is negative pressure in the tank that sucks air from outside and I guess there is some protective shutter that that makes the clapping. Driving Yaris 2007 hatchback with 2SZFE 1.3 engine. Bought it in 2012, always behaves like that, never threw a code, never had any problem with this.