Charcoal Canister Delete?

[cody at 5000tq.com]

Quoting Mike Arman <Armanmik at earthlink.net>:

>> <cody at 5000tq.com>
> <quattro at audifans.com>
>> Subject: Re: Charcoal Canister Delete?
>
> <snip>
>
>  This is why P-ZEV emission standard
>> vehicles (primarily seen in California) have a sealed fuel tank with the
>> pump and the fuel filter locked inside forever - the fuel vapors released
>> during a fuel filter or fuel pump change pollute more than what's coming out
>> of the exhaust pipe.
>>
>> -Cody
>
>
> Cody,
>
>
> Does this mean if the pump goes bad or the filter gets clogged, you  
> have to buy the *whole* sealed gas tank assembly with new  
> pump/filter/etc.? And pay for R&R the tank (which is tucked and  
> armored way up above the exhaust system and rear suspension) instead  
> of just the pump or filter? and probably treat the removed parts as  
> toxic waste to be hauled off by guys in moon suits (for $$$$$$ per  
> gas tank) to be disposed of in some "environmentally benign" (more  
> $$$$$$$$$$$) approved way?
>
>
> Am I reading this wrong or are those guys in CA nuts?
>
>
> Best Regards,
>
> Mike Arman
> 90V8Q


No, Mike, you've got it all wrong. The fuel pump will simply not ever  
fail! :rolleyes:. The filter is supposed to be rated for 100k miles  
IIRC, it's huge.


I've got numbers here for you guys from the last evaporative emissions  
training class I attended (about 2 years ago). This is hand copied  
quickly so excuse typos and abbreviation please ;-)

"Testing indicates that an evaporative emission leak of 0.5mm (0.020")  
can cause hydrocarbon emissions of about 1.35 grams HC per mile. This  
is more than 30 times the allowable standard.

A dime weighs 2.268 grams. Imagine the equivalent mass of HC released  
every two miles due to an evap emissions leak.

Looking at leaks in a different way, raw gasoline constitutes about  
24,000ppm of HC. Typical tailpie exhaust gas levels for a good running  
OBDII vehicle will be about 0-12ppm HC. In practice, small evap leaks  
identified with an exhaust gas analyzer will produce levels exceeding  
7000ppm.

It's easy to see that even a small evap leak can dwarf hydrocarbon  
emission levels produced at the tailpipe.

Now if I just had that dime for every gram of HC released..."


 From the page on P-ZEV emissions:
"How is a PZEV different from a standard vehicle?
- Must meet SULEV standards
-Zero evaporative emissions are allowed, requiring:
--Impermeable gas tanks including steel tanks, tanks with bladders,  
and specially compounded plastic tanks
--Carbon canisters with twice the activated charcoal
--More robust fuel lines with better connections, metal valve covers  
and metal breather pipes
-Cats with twice the precious metals
-More precise fuel and combustion controls with completely sealed  
metal fuel systems

Vehicles are required to maintain SULEV standards for 150,000 miles.  
They must minimilise catalyst degradation and contamination to meet  
this. Burning engine oil can contaminate cats with phosphorus and  
degrade performance. One OE specifies that PZEV's must burn less than  
3.5 quarts of oil over 150,000 miles. PZEVs will even require a  
150,000 emissions warrenty in most states."



I can take pictures of some pages for those interested in learning more.

-Cody