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no hiss opening gas cap

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TheGrinder(ofgears)
User

Jun 3, 2021, 6:46 PM

Post #1 of 5 (856 views)
no hiss opening gas cap Sign In
did a prepurchase inspection on the same vehicle twice. three times opening the gas cap, and no hiss sound, i.e. no gas tank vacuum or positive pressure. is this a red flag?



2016 Honda Odyssey EX-L


(This post was edited by TheGrinder(ofgears) on Jun 3, 2021, 6:47 PM)


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 4, 2021, 12:29 AM

Post #2 of 5 (834 views)
Re: no hiss opening gas cap Sign In
No. If that was a problem or you somehow think so get codes pre-purchase and see if there is something wrong,
T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 4, 2021, 3:42 AM

Post #3 of 5 (825 views)
Re: no hiss opening gas cap Sign In
No, there is not supposed to be pressure. The system is vented. You wouldn't be able to fill the tank otherwise.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



TheGrinder(ofgears)
User

Jun 4, 2021, 6:27 AM

Post #4 of 5 (814 views)
Re: no hiss opening gas cap Sign In
is that model specific? i thought fuel pumps generally pull a slight vacuum on the tank.

yes the system is vented, but it looks like there are 3 different pressure sensitive valves it has to get through to get to the vent:




Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 4, 2021, 7:07 AM

Post #5 of 5 (810 views)
Re: no hiss opening gas cap Sign In
The system has to be normally vent into a charcoal canister. It has pressure sensors and shut off solenoids that are used for self testing to assure the system is sealed tight. as I stated before, you wouldn't be able to fill the tank if it was not vented.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.






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