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Help my truck failed the new Fuel Evap Smog Test
- Thread starter overseaz
- Start date
rickcdewitt
Well-Known Member
funny how people single out CA when there are many places with stringent smog laws from overpollution in the past.
and there are counties in CA where you only smog once during your ownership
and there are counties in CA where you only smog once during your ownership
xplodezeus
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Back in 2001 I had mine replaced it was leaking fuel when I was filling up.
In 2015 I just failed the evap test here in Cali. All the other smog tests it passed fine.
I'll be doing this repair over the weekend. Getting a new fuel filler neck off amazon for $45. Removing the bed myself trying to save that money.
• question: does the fuel tank gets pressurized normally? I'm thinking that's why when we unscrew the fuel cap you hear The pressure released. When I get the bed off I wanted to do a soapy water test and see if any bubbles delvelope. Just checking to see if this logic should work?
In 2015 I just failed the evap test here in Cali. All the other smog tests it passed fine.
I'll be doing this repair over the weekend. Getting a new fuel filler neck off amazon for $45. Removing the bed myself trying to save that money.
• question: does the fuel tank gets pressurized normally? I'm thinking that's why when we unscrew the fuel cap you hear The pressure released. When I get the bed off I wanted to do a soapy water test and see if any bubbles delvelope. Just checking to see if this logic should work?
- Joined
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- 1,621
- Vehicle Year
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- 2.3 (4 Cylinder)
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- vertical and above ground
The tank will build pressure when the temperature of the fuel increases. The tank is more or less sealed to prevent outflow of vapor, but will allow ambient to flow in to replace the fuel as it is used up. The vapor recovery system is connected to the tank, and has a chunk of charcoal(i think) that will absorb fuel vapors and limit the vapor pressure in the tank to some degree, thus preventing unburned hydrocarbons from wafting into the atmosphere.
There are a few components to the system. Charcoal canister, control valve, lines, and connection to the tank. More or less. The control valve lets vapor out of the canister and connects it to the intake manifold so the vapors can be pulled out of the carbon and fed to the engine in normal operation. The valve is computer controlled.
The vapor pressure in the tank will sometimes be more than normal depending on the actual mix in the fuel, and how the vehicle has been operated.
I am very surprised that the pressure used is 35psi. That is some serious pressure. More than recommended for some car & truck tires! (all of mine.)
tom
There are a few components to the system. Charcoal canister, control valve, lines, and connection to the tank. More or less. The control valve lets vapor out of the canister and connects it to the intake manifold so the vapors can be pulled out of the carbon and fed to the engine in normal operation. The valve is computer controlled.
The vapor pressure in the tank will sometimes be more than normal depending on the actual mix in the fuel, and how the vehicle has been operated.
I am very surprised that the pressure used is 35psi. That is some serious pressure. More than recommended for some car & truck tires! (all of mine.)
tom
Mazda
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- Aug 8, 2007
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- Temecula, CA
- Vehicle Year
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- 2.3 (4 Cylinder)
- Transmission
- Manual
Back in 2001 I had mine replaced it was leaking fuel when I was filling up.
In 2015 I just failed the evap test here in Cali. All the other smog tests it passed fine.
I'll be doing this repair over the weekend. Getting a new fuel filler neck off amazon for $45. Removing the bed myself trying to save that money.
• question: does the fuel tank gets pressurized normally? I'm thinking that's why when we unscrew the fuel cap you hear The pressure released. When I get the bed off I wanted to do a soapy water test and see if any bubbles delvelope. Just checking to see if this logic should work?
Also check the evap hoses going up to the canister. Especially the one that has a 90 degree bend in it. It's on the top of the canister. If that is cracked or broken then just remove it and place a 6inch replacement hose in it's place. Are you located anywhere close to me in Temecula. I know of a really good smog place to go.
Mazda
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Yeah some things are just crazy but hell a lot of it makes sense. If you lived here and saw all the pollution and crap when I was growing up as a kid you would understand why. Back then you couldn't even see the skyline. Now 25 years later or so. Probably 50% more cars on the road and the air quality is a lot better since we started the smog checks. So I really don't mind it at all.
If you keep up on your maintenance $45.00 bucks every 2 years is nothing. I have only once failed a smog check and later they found the sniffer to be faulty.
Bryan
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Mazda sed:Back then you couldn't even see the skyline. Now 25 years later or so. Probably 50% more cars on the road and the air quality is a lot better since we started the smog checks.
Back then started about 1967 when the 1st add-on bits were required. Many cars had A.I.R. pumps that forced air into the exhaust manifold. Plumbing and vacuum lines and thermostatic vacuum switches and so on were connected as a band-aid.
More was added at C.A.R.B.'s mandate in the 1970's, even to older vehicles that had been manufactured without smog controls. The STP kit delayed vacuum advance to the distributor, and bled air into the intake on deceleration, and others used temperature sensors to regulate timing. If the timing delay caused overheating, the timing was allowed to go back to original design. The 'add-ons' were over-priced gadgets that made some cars run poorly, and made their objective to reduce emissions questionable.
In the mid-70's, lead-free gasoline was mandated, and catalytic converters became pretty much a standard. Evaporative controls were added in the mid-70's also.
The C.A.R.B. has become what all bureaucracies become, something interested in keeping itself useful, rather than declaring success and folding shop.
They have some baroque rules about smog checks and vehicle repair, some non-intelligible rules for older vehicles, and buy-backs of old vehicles to get them off the road, no matter their historical value. Private sales have become restricted more than before, and if you cannot find the part for your 1973 Ranger, you won't get a current registration.
Some of their regulations are seemingly contradictory, but the larger problem, if you want to call it that, is that vehicles on the road last longer due to the clement weather and lack of road salt. Older vehicles had different emissions standards, so the improvement has slowed. C.A.R.B. is looking for things to do, even though you can see the snow on the mountains from 40 miles away.
My SIL a Temecula resident, is proprietor of a paint & body shop in San Jacinto, and had to replace his paint dispensing system, from the bare concrete floor up, due to changes in how much VOC he could 'emit'. He has to account for every ounce of paint & primer, and monthly reports are demanded by C.A.R.B.(California Air Resources Board).
CA imports some of its electricity and exports the resulting emissions, while patting itself on the back. CA has oil offshore that oozes from the seafloor, causing tar balls on the beaches, and won't tap into those resources, instead expecting other states to suffer the wells and rigs. CA has/had 'special' gasoline formulas, had 'special' smog requirements above the 49-state rules, which resulted in poorer fuel economy for the most part.
In my opinion, worth exactly what you pay, I think they have gotten the 99.9% of attainable results, and are picking the bones of the carcass, looking for tid-bits where they can tweak their regulations, or create new ones from whole cloth, at more cost to the consumer, and decreasing returns in emission controls. They have gone overboard, IMO.
There is a statistic about a pre-emissions, mid-60's?, Ford parked in the drive putting out more hydrocarbons sitting still for 24 hours, than a then-new Ford did driving 50 miles, or similar. They have won the war, and are looking for more enemy where there is none to be conquered. Wish they'd stop.
C.A.R.B. has decided they have to certify non-OEM exhaust system parts, and requires a stamped label of approval or the parts are deemed ineffective and illegal. If you need to replace your catalytic converter-manifold on an Escape 3.0, the OEM parts will cost somewhere in the $1,000 range. After-market, legal in the 49 other states, are in the $500 range. Just can't use them in CA. How many usable late-model vehicles are discarded and destroyed because of those regulations? What older models are left on the road because late models have been junked? Some things don't make a lot of sense to me.
tom
Back then started about 1967 when the 1st add-on bits were required. Many cars had A.I.R. pumps that forced air into the exhaust manifold. Plumbing and vacuum lines and thermostatic vacuum switches and so on were connected as a band-aid.
More was added at C.A.R.B.'s mandate in the 1970's, even to older vehicles that had been manufactured without smog controls. The STP kit delayed vacuum advance to the distributor, and bled air into the intake on deceleration, and others used temperature sensors to regulate timing. If the timing delay caused overheating, the timing was allowed to go back to original design. The 'add-ons' were over-priced gadgets that made some cars run poorly, and made their objective to reduce emissions questionable.
In the mid-70's, lead-free gasoline was mandated, and catalytic converters became pretty much a standard. Evaporative controls were added in the mid-70's also.
The C.A.R.B. has become what all bureaucracies become, something interested in keeping itself useful, rather than declaring success and folding shop.
They have some baroque rules about smog checks and vehicle repair, some non-intelligible rules for older vehicles, and buy-backs of old vehicles to get them off the road, no matter their historical value. Private sales have become restricted more than before, and if you cannot find the part for your 1973 Ranger, you won't get a current registration.
Some of their regulations are seemingly contradictory, but the larger problem, if you want to call it that, is that vehicles on the road last longer due to the clement weather and lack of road salt. Older vehicles had different emissions standards, so the improvement has slowed. C.A.R.B. is looking for things to do, even though you can see the snow on the mountains from 40 miles away.
My SIL a Temecula resident, is proprietor of a paint & body shop in San Jacinto, and had to replace his paint dispensing system, from the bare concrete floor up, due to changes in how much VOC he could 'emit'. He has to account for every ounce of paint & primer, and monthly reports are demanded by C.A.R.B.(California Air Resources Board).
CA imports some of its electricity and exports the resulting emissions, while patting itself on the back. CA has oil offshore that oozes from the seafloor, causing tar balls on the beaches, and won't tap into those resources, instead expecting other states to suffer the wells and rigs. CA has/had 'special' gasoline formulas, had 'special' smog requirements above the 49-state rules, which resulted in poorer fuel economy for the most part.
In my opinion, worth exactly what you pay, I think they have gotten the 99.9% of attainable results, and are picking the bones of the carcass, looking for tid-bits where they can tweak their regulations, or create new ones from whole cloth, at more cost to the consumer, and decreasing returns in emission controls. They have gone overboard, IMO.
There is a statistic about a pre-emissions, mid-60's?, Ford parked in the drive putting out more hydrocarbons sitting still for 24 hours, than a then-new Ford did driving 50 miles, or similar. They have won the war, and are looking for more enemy where there is none to be conquered. Wish they'd stop.
C.A.R.B. has decided they have to certify non-OEM exhaust system parts, and requires a stamped label of approval or the parts are deemed ineffective and illegal. If you need to replace your catalytic converter-manifold on an Escape 3.0, the OEM parts will cost somewhere in the $1,000 range. After-market, legal in the 49 other states, are in the $500 range. Just can't use them in CA. How many usable late-model vehicles are discarded and destroyed because of those regulations? What older models are left on the road because late models have been junked? Some things don't make a lot of sense to me.
tom
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