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11-29-2023, 03:54 PM | #1 |
Drives: VERSO S Join Date: Jul 2021
Location: Bromsgrove
Posts: 44
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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 |
11-30-2023, 09:39 AM | #2 |
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. |
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12-01-2023, 01:09 AM | #3 | |
Drives: NCP90 TRD Yaris Manual Join Date: Oct 2022
Location: Auckland, NZ
Posts: 267
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Quote:
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12-07-2023, 02:31 AM | #4 |
Drives: Yaris 06 - 5dr hatchback Join Date: Aug 2015
Location: Birmingham, UK
Posts: 390
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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.
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- Yaris 2006, 1.0, 5 door hatchback "Betty" - 240,000 miles UK to Nordkapp in a Yaris
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