Re: Car stalls when I take off the gas cap

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Old 16 Aug 2003, 08:08 pm   #1 (permalink)
Philip®
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Default Re: Car stalls when I take off the gas cap

A wrote:
> After a lot of stop and go driving today, I began smelling a
> slight whiff of gas inside my 1989 Camry. Seeing as it is so hot
> outside I thought maybe it was caused by too much vapor pressure
> in the gas tank. Leaving the car running I opened the gas tank
> cap. A lot of vapor whooshed out of the gas tank (which I
> understand might be normal) and then the car stalled.... which
> seems wierd.
>
> I replaced the gas cap, started the car - then again removed the
> gas cap - another whoosh of vapor escaped - and the car stalled
> again.
>
> Is this normal?


The condition you described is indicative of a malfunctioning purge
valve on the charcoal canister and/or the BVSV valve is
closed/plugged. (BPSV is a coolant temperature controlled path for
canister vapors to enter the intake manifold.) If you remove the
fuel cap to vent all pressure, replace the cap for a few minutes, and
then find more pressure upon cap re-removal then you have fuel that
is being heated excessively. Ported vacuum is supposed to prevent
pressure build up in the fuel tank while driving ... but only if the
canister valves and BPSV valve are not clogged or otherwise
inoperative. A little puff of pressure is one thing ... a BIG WHOOSH
is quite different.
--

~~Philip

cantankerous | kan-TANG-kruss
- adjective: difficult or irritating to deal with.

Example: Philip was always cantankerous in the
morning, given to snapping and snarling until he'd
had his first cup of coffee and a soothing hot shower.





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Old 18 Aug 2003, 06:25 pm   #2 (permalink)
A
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Default Re: Car stalls when I take off the gas cap

I had my garage check these today & they found both working fine. They put
the BVSV valve in a freezer then took it out & found it was opening &
closing correctly.

Just now I tried removing the gas cap - and there is no Whoosh - and the car
keeps on running!! So maybe there was some kind of temporary heat-related
problem that caused the gas smell and the whoosh/stall on Saturday - or -
maybe when the garage removed & checked the parts then put them back on that
this made a better connection & that fixed it.

I dunno!!!


"Philip®" <chipstate@earthlink.net> wrote in message
newsAA%a.5812$Nf3.996@newsread4.news.pas.earthli nk.net...
> A wrote:
> > After a lot of stop and go driving today, I began smelling a
> > slight whiff of gas inside my 1989 Camry. Seeing as it is so hot
> > outside I thought maybe it was caused by too much vapor pressure
> > in the gas tank. Leaving the car running I opened the gas tank
> > cap. A lot of vapor whooshed out of the gas tank (which I
> > understand might be normal) and then the car stalled.... which
> > seems wierd.
> >
> > I replaced the gas cap, started the car - then again removed the
> > gas cap - another whoosh of vapor escaped - and the car stalled
> > again.
> >
> > Is this normal?

>
> The condition you described is indicative of a malfunctioning purge
> valve on the charcoal canister and/or the BVSV valve is
> closed/plugged. (BPSV is a coolant temperature controlled path for
> canister vapors to enter the intake manifold.) If you remove the
> fuel cap to vent all pressure, replace the cap for a few minutes, and
> then find more pressure upon cap re-removal then you have fuel that
> is being heated excessively. Ported vacuum is supposed to prevent
> pressure build up in the fuel tank while driving ... but only if the
> canister valves and BPSV valve are not clogged or otherwise
> inoperative. A little puff of pressure is one thing ... a BIG WHOOSH
> is quite different.
> --
>
> ~~Philip
>
> cantankerous | kan-TANG-kruss
> - adjective: difficult or irritating to deal with.
>
> Example: Philip was always cantankerous in the
> morning, given to snapping and snarling until he'd
> had his first cup of coffee and a soothing hot shower.
>
>
>
>
>



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Old 18 Aug 2003, 08:39 pm   #3 (permalink)
Philip®
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Default Re: Car stalls when I take off the gas cap

A wrote:
> I had my garage check these today & they found both working fine.
> They put the BVSV valve in a freezer then took it out & found it
> was opening & closing correctly.


The BVSV should be closed below about 110 degree F.

>snip>

- or - maybe when the garage removed &
> checked the parts then put them back on that this made a better
> connection & that fixed it.


Forcing air or some carb cleaner thru the ports on the charcoal
cannister can remove accumulated goo from the two check valve balls.
Ego... fixed venting problem.
--

~~Philip

cantankerous | kan-TANG-kruss
- adjective: difficult or irritating to deal with.

Example: Philip was always cantankerous in the
morning, given to snapping and snarling until he'd
had his first cup of coffee and a soothing hot shower.




>
> "Philip®" <chipstate@earthlink.net> wrote in message
> newsAA%a.5812$Nf3.996@newsread4.news.pas.earthli nk.net...
>> A wrote:
>>> After a lot of stop and go driving today, I began smelling a
>>> slight whiff of gas inside my 1989 Camry. Seeing as it is so hot
>>> outside I thought maybe it was caused by too much vapor pressure
>>> in the gas tank. Leaving the car running I opened the gas tank
>>> cap. A lot of vapor whooshed out of the gas tank (which I
>>> understand might be normal) and then the car stalled.... which
>>> seems wierd.
>>>
>>> I replaced the gas cap, started the car - then again removed the
>>> gas cap - another whoosh of vapor escaped - and the car stalled
>>> again.
>>>
>>> Is this normal?

>>
>> The condition you described is indicative of a malfunctioning
>> purge valve on the charcoal canister and/or the BVSV valve is
>> closed/plugged. (BPSV is a coolant temperature controlled path
>> for canister vapors to enter the intake manifold.) If you
>> remove the fuel cap to vent all pressure, replace the cap for a
>> few minutes, and then find more pressure upon cap re-removal then
>> you have fuel that is being heated excessively. Ported vacuum
>> is supposed to prevent pressure build up in the fuel tank while
>> driving ... but only if the canister valves and BPSV valve are
>> not clogged or otherwise inoperative. A little puff of pressure
>> is one thing ... a BIG WHOOSH is quite different.
>> --
>>
>> ~~Philip
>>
>> cantankerous | kan-TANG-kruss
>> - adjective: difficult or irritating to deal with.
>>
>> Example: Philip was always cantankerous in the
>> morning, given to snapping and snarling until he'd
>> had his first cup of coffee and a soothing hot shower.




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Old 18 Aug 2003, 11:15 pm   #4 (permalink)
A
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Default Re: Car stalls when I take off the gas cap

Hi Philip,

I just got back from a 1 hour highway run - the gas tank is now on empty -
with the car running I removed the gas cap - no whoosh and no stall. So
maybe as you say the garage got rid of an obstruction in the charcoal
cannister because I had noticed in the past what seemed like a vacuum when I
would remove the gas cap after coming off the highway with the tank on empty
(sort of the reverse of what I experienced on Sat with gas tank pressure).

Now if I could only get my intermittent starter problem fixed....


"Philip®" <chipstate@earthlink.net> wrote in message
news:idf0b.597$xD6.404@newsread3.news.pas.earthlin k.net...
> A wrote:
> > I had my garage check these today & they found both working fine.
> > They put the BVSV valve in a freezer then took it out & found it
> > was opening & closing correctly.

>
> The BVSV should be closed below about 110 degree F.
>
> >snip>

> - or - maybe when the garage removed &
> > checked the parts then put them back on that this made a better
> > connection & that fixed it.

>
> Forcing air or some carb cleaner thru the ports on the charcoal
> cannister can remove accumulated goo from the two check valve balls.
> Ego... fixed venting problem.
> --
>
> ~~Philip
>
> cantankerous | kan-TANG-kruss
> - adjective: difficult or irritating to deal with.
>
> Example: Philip was always cantankerous in the
> morning, given to snapping and snarling until he'd
> had his first cup of coffee and a soothing hot shower.
>
>
>
>
> >
> > "Philip®" <chipstate@earthlink.net> wrote in message
> > newsAA%a.5812$Nf3.996@newsread4.news.pas.earthli nk.net...
> >> A wrote:
> >>> After a lot of stop and go driving today, I began smelling a
> >>> slight whiff of gas inside my 1989 Camry. Seeing as it is so hot
> >>> outside I thought maybe it was caused by too much vapor pressure
> >>> in the gas tank. Leaving the car running I opened the gas tank
> >>> cap. A lot of vapor whooshed out of the gas tank (which I
> >>> understand might be normal) and then the car stalled.... which
> >>> seems wierd.
> >>>
> >>> I replaced the gas cap, started the car - then again removed the
> >>> gas cap - another whoosh of vapor escaped - and the car stalled
> >>> again.
> >>>
> >>> Is this normal?
> >>
> >> The condition you described is indicative of a malfunctioning
> >> purge valve on the charcoal canister and/or the BVSV valve is
> >> closed/plugged. (BPSV is a coolant temperature controlled path
> >> for canister vapors to enter the intake manifold.) If you
> >> remove the fuel cap to vent all pressure, replace the cap for a
> >> few minutes, and then find more pressure upon cap re-removal then
> >> you have fuel that is being heated excessively. Ported vacuum
> >> is supposed to prevent pressure build up in the fuel tank while
> >> driving ... but only if the canister valves and BPSV valve are
> >> not clogged or otherwise inoperative. A little puff of pressure
> >> is one thing ... a BIG WHOOSH is quite different.
> >> --
> >>
> >> ~~Philip
> >>
> >> cantankerous | kan-TANG-kruss
> >> - adjective: difficult or irritating to deal with.
> >>
> >> Example: Philip was always cantankerous in the
> >> morning, given to snapping and snarling until he'd
> >> had his first cup of coffee and a soothing hot shower.

>
>
>



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Old 19 Aug 2003, 12:11 am   #5 (permalink)
Philip®
Guest
  • Posts: n/a
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Default Re: Car stalls when I take off the gas cap

Hey... I gotta get it right once in a while. ;-) A small vacuum in
evidence when the cap is removed is "normal."
--

~~Philip

cantankerous | kan-TANG-kruss
- adjective: difficult or irritating to deal with.

Example: Philip was always cantankerous in the
morning, given to snapping and snarling until he'd
had his first cup of coffee and a soothing hot shower.


>A wrote:
> Hi Philip,
>
> I just got back from a 1 hour highway run - the gas tank is now on
> empty - with the car running I removed the gas cap - no whoosh and
> no stall. So maybe as you say the garage got rid of an
> obstruction in the charcoal cannister because I had noticed in the
> past what seemed like a vacuum when I would remove the gas cap
> after coming off the highway with the tank on empty (sort of the
> reverse of what I experienced on Sat with gas tank pressure).
>
> Now if I could only get my intermittent starter problem fixed....
>
>
> "Philip®" <chipstate@earthlink.net> wrote in message
> news:idf0b.597$xD6.404@newsread3.news.pas.earthlin k.net...
>> A wrote:
>>> I had my garage check these today & they found both working fine.
>>> They put the BVSV valve in a freezer then took it out & found it
>>> was opening & closing correctly.

>>
>> The BVSV should be closed below about 110 degree F.
>>
>>> snip>

>> - or - maybe when the garage removed &
>>> checked the parts then put them back on that this made a better
>>> connection & that fixed it.

>>
>> Forcing air or some carb cleaner thru the ports on the charcoal
>> cannister can remove accumulated goo from the two check valve
>> balls. Ego... fixed venting problem.
>> --
>>
>> ~~Philip
>>
>> cantankerous | kan-TANG-kruss
>> - adjective: difficult or irritating to deal with.
>>
>> Example: Philip was always cantankerous in the
>> morning, given to snapping and snarling until he'd
>> had his first cup of coffee and a soothing hot shower.
>>
>>
>>
>>
>>>
>>> "Philip®" <chipstate@earthlink.net> wrote in message
>>> newsAA%a.5812$Nf3.996@newsread4.news.pas.earthli nk.net...
>>>> A wrote:
>>>>> After a lot of stop and go driving today, I began smelling a
>>>>> slight whiff of gas inside my 1989 Camry. Seeing as it is so
>>>>> hot outside I thought maybe it was caused by too much vapor
>>>>> pressure in the gas tank. Leaving the car running I opened
>>>>> the gas tank cap. A lot of vapor whooshed out of the gas
>>>>> tank (which I understand might be normal) and then the car
>>>>> stalled.... which seems wierd.
>>>>>
>>>>> I replaced the gas cap, started the car - then again removed
>>>>> the gas cap - another whoosh of vapor escaped - and the car
>>>>> stalled again.
>>>>>
>>>>> Is this normal?
>>>>
>>>> The condition you described is indicative of a malfunctioning
>>>> purge valve on the charcoal canister and/or the BVSV valve is
>>>> closed/plugged. (BPSV is a coolant temperature controlled path
>>>> for canister vapors to enter the intake manifold.) If you
>>>> remove the fuel cap to vent all pressure, replace the cap for a
>>>> few minutes, and then find more pressure upon cap re-removal
>>>> then you have fuel that is being heated excessively. Ported
>>>> vacuum is supposed to prevent pressure build up in the fuel
>>>> tank while driving ... but only if the canister valves and BPSV
>>>> valve are not clogged or otherwise inoperative. A little puff
>>>> of pressure is one thing ... a BIG WHOOSH is quite different.
>>>> --
>>>>
>>>> ~~Philip
>>>>
>>>> cantankerous | kan-TANG-kruss
>>>> - adjective: difficult or irritating to deal with.
>>>>
>>>> Example: Philip was always cantankerous in the
>>>> morning, given to snapping and snarling until he'd
>>>> had his first cup of coffee and a soothing hot shower.




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