fuel charcoal canister
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fuel charcoal canister Q&A Review
What causes a charcoal canister to fill with fuel?
A faulty purge valve, sensor, or servo. The purge valve is what opens to draw out gasoline fumes from the gas tank. It is controlled by a series of sensors, servos, and the ECM. The EVAP system only operates under certain conditions. These conditions are generally when the fuel level is between 1/4–3/4 full, the engine is at operating temperature, and the vehicle is moving. Therefore, it is impossible for gasoline to enter the canister by filling the fuel tank all the way up. Some vehicles even ...
Is it true that the new Royal Enfield EFI owners are asked to fill only half their tanks by the service station personnel?
Haha.. A bit of misunderstanding there. That is not the problem of EFI engine brother. For EFI engine, it is advisable other way around. In EFI engine, the fuel PUMP sensor needs to be submerged always for the ECU to function properly. So you always need to have 3 ltrs of fuel in your tank always for EFI engine. Now the issue you’ve mentioned is not because of the EFI or EFI tube. This issue is because of the BS4 norm that have been implemented. So as per one of the criteria of BS4 norm, the vehicle needs to have a charcoal canister attached to the fuel tank which actually helps in minimizing fuel vapors emission by absorbing them in warm/hot environment and again releasing the condensed fuel back to the tank after cooling down. In RE’s, the tube for this charcoal canister is placed slightly below in level. And if the tank is filled completely than that chokes up the tube for canister and fuel flows directly to canister in liquid form. so to avoid this, service station people ask us not to fill the fuel up to the brim in your tank. Hope this answers your concern. Please upvote if this helps. Happy Thumping.. EDIT: ,Over 1.8k views.. this is the highest on any of my answers. Thanks for the upvotes and views guys. Happy Reading!
What is the difference between royal Enfield BS4 engine and BS3 engine?
There are a few changes which differentiates BS3 from BS4. AHO - Auto/Always/Automatic Headlight On. The absense of a headlight switch. There is a charcoal canister added alongside with the carburettor which takes the gas present in the fuel tank and sends it to the carburettor, this enhances effective usage of fuel and increasing mileage. Find the pictures below Two additional tubes visible in the carburettor Additional tube found below the fuel tank taking the gas from tank to the charcoal canister. The new charcoal canister Finally, additional catalytic converter in the silencer. The older BS3 models had only one catalytic converter, but the new own dons two. So, better pollution control. I guess these are some major visible changes in BS3 and BS4. Information Source: ,Monu Sagar,, , RE expert. Like my answer? Don't forget to share. Edit 1: ,The “charcoal unit” has been renamed to it’s correct term as “charcoal canister”.
How much gas is wasted when people keep trying to top off their already full tank? Don't they know once the automatic shutoff stops, any more fuel that is pumped in goes into a charcoal EVAP canister hidden inside the vehicle's body?
I do not think that is true (about the extra gas going into the evap. canister). And even if it was (true, that is), the system would be designed such that the gas would NOT evaporate to the outside world. The whole idea of the fuel system is to keep the gas IN the car, and not let it evaporate away. Anyway, I detest stopping for gas, so I tend to overfill. In fact, I have on occasion put 62 litres into a 50 litre tank (OK, I was very, VERY low on gas at the time). The important point, I think, is that when I do overfill, I get an extra 200 kilometers of range out of my full tank versus just filling to the first or second click stop. That is a lot less stopping for gas, which is the point, for me. And anyone who suggests I am damaging the system or somethingorother, I just threw out my car (scrap yard got it) after almost 300,000 kilometres. There was nothing wrong with the fuel system (lots of other things, but not fuel). So all that overfilling damaged not a thing, so make of that what you will. In closing, I know I shouldn’t, really, but filling up is yucky for me (so the fewer the better), and I got a lot of extra range per tank, AND there was never any gas smell indicating venting to the environment. The car was a crappy (but extremely reliable) Toyota Corolla S 5-Speed manual. No gas was wasted in the writing of this message (or in the over-pumping into the car, IMHO (yes, I was paying attention…)).
What are the errors in the Royal Enfield Classic 350, in the BS4 version?
There could be a handful of minor glitches with the new engine, but one huge error/faulty design which I have seen is related to the main feature as part of the BS4. Hope you know that there is a new, “charcoal canisters” ,added which takes the fumes/gas from the petrol tank and sends back to the carburettor. This helps in efficient usage of fuel. If you need detailed info on the charcoal canister part, read ,Aashiesh Bohraa's answer to What is the difference between royal Enfield BS4 engine and BS3 engine? Now, coming back to the error with it. The tube which takes the fumes/gas from the tank to the charcoal canister is placed in such a way that, if you fill your tank to it neck (tank full as generally described), it would make the tube immersed in petrol leading to the petrol findig its way to the charcoal canister end up clogging it, creating ‘missing’ issue. Remember, the canister is designed to work only with fumes/gas, so when liquid enters, the canister goes berserk and throws up. This has been brought to notice with the service center folks and their smart fix is “don’t fill up your tank to it maximum capacity”. I find this absolutely absurd. Hope they get some real fix to it. So, RE BS4 owners, aware yourself! Like my answer? Don't forget to share.
Is ethanol bad for carbureted engines?
Mostly yes. Ethanol isn’t really bad for the engine if the fuel is fresh. It will burn fine, and aside from worse gas mileage due to lower energy density of ethanol versus gasoline there are no ill effects. What ethanol is really bad for is carburetors themselves. Older carburetors that haven’t been rebuilt in the last 10–20 years can suffer deterioration in rubber parts. Newer polymers are able to deal with ethanol no problem. The real trouble is the carburetor bowl. It really is pretty much what it says - it’s a bowl of fuel just sitting there. It’s open to the air. This causes the fuel to evaporate. Ethanol makes this worse because it evaporates quicker than gasoline. This leads to fuel blend separation and formation of “varnish”, which is more or less congealed petroleum fractions. This stuff clogs carburetor passages and, if sucked into the engine, can leave behind carbon deposits, which is basically charcoal left when it burns. Some “California emissions” vehicles vented carburetor bowls into a charcoal canister, but that only collects the vapors and does nothing to stop the evaporation. The other problem with ethanol is that it is hygroscopic. That means it absorbs moisture from the air. Water and gasoline don’t mix, and the water precipitates out because it’s heavier. You wind up with standing water in the fuel system. A lawnmower left with fuel in the carburetor over the winter will not start until you drain the bowl because of this - it will be sucking water from the bottom, and water doesn’t burn. Water causes corrosion in the carburetor, and, weirdly enough, can develop algae in it. I have seen motorcycle carburetors that were literally green from this. Algae, obviously, don’t improve the function of the system any. Ethanol-free gasoline is not entirely problem-free. It will evaporate eventually and some varnish will form, but this will happen much more slowly. It will not collect water at all, though. Personally, I try to run anything I have that is carbureted on ethanol-free.
Why do so many people recommend you check the OBD codes before you take a car to the mechanic?
I am a mechanic. I own my own shop. I have thousands of dollars tied up in various scanners. I have to charge you whenever I hook those things to your car. When your “check engine light “ comes on it is always because of something affecting emissions. Always ! Even a transmission code can affect what comes out of the tailpipe. transmission codes also trigger the “check engine light”. I would venture an educated guess that maybe 75% of codes today are flagged by the EVAP system. The EVAP system is designed to contain gas fumes, store them in the charcoal canister and reintroduce them into the combustion cycle when the engine is ready to take them. If you do not tighten your fuel cap for example you will get something like a P0455, gross leak detected. Any code in the EVAP system will not cause further damage to the engine or leave you stranded. One code that can be a pain in the ass is the one for a stuck closed vent valve. When the vent valve sticks in the closed position you will have a very hard time putting gas in the car as the air displaced by the fuel has no way to escape other than through the filler neck and so the car will burb and it will take forever to fill the tank. A lot of customers that come to the shop with an EVAP code decide to live with the light when I tell them that I can fix it but it won’t do squat for the performance or safety of the vehicle if they decide to leave it alone. It’s not good for the environment however and the car will not pass an emissions test . Get yourself a cheap code reader and check what the light is on for every now and again. OBD 2 codes are standardised for all makes and models . Some codes however can be a real nightmare to diagnose and fix, even for seasoned mechanics. Also, when the check engine light flashes it is time to shut down the engine and take the car to your favourite mechanic as a flashing light means a severe enough misfire that could fuck up the catalytic converter. Cats are not cheap !
Why is there no canister in a diesel engine?
Charcoal canister is used to reduce the evaporative emission in vehicle. During the soak time of the vehicle the fuel in fuel tank and in carburettor bowl is evaporated.This evaporated fuel is mixed to atmosphere and causes pollution. To avoid this evaporative emission control device uses charcoal canister it consists of activated charcoal which absorbs the evaporated fuel and supplies the fuel to the cylinder during running condition. So why this canister not used in diesel engine is simple is due to the fact that the diesel evaporative temperature is somewhat higher than the gasoline is because diesel is heavier than gasoline.Diesel having 10 to 20 carbon atoms per molecule but gasoline having only 5 to 10 carbon atoms per molecule . So the diesel in fuel tank not easily evaporated at operating temperature so that no need of canister in diesel engine.
Why is it absolutely impossible to siphon gas out of a mid-nineties Mercury Villager minivan?
It’s not just a Mercury Villager, but a lot of modern automobiles. Inside the filler neck of many modern cars, usually near the bottom, a small anti-splash device is usually installed. These can be in the form of a hollow, plastic ball in a cage or a one way flap. The purpose of these is to prevent fuel in the tank from sloshing up into the filler tube when the car is being driven. Sloshing in the filler tube can cause excess fuel to be drawn into the evaporative emission system, including into the charcoal canister. The way many of these one-way valves work, fluid can flow into the tank freely, but inserting something like a hose into the opening, will not work. It will strike the floating ball or flap and be stopped.
What's wrong with my car if I can smell gas while I am driving?
Anytime you can smell gas it can conceivably be a dangerous situation, so this answer does not take the place of professional advice. If you most often notice this after fueling, it is most likely that the filter in your Onboard Refueling Vapor Recovery (ORVR) system, also called the EVAP system and commonly known as the "charcoal canister", has been flooded with gas and needs to be replaced. If you are in the habit of "topping off" your tank (that is, filling up that last extra bit after the fuel pump switches off automatically) this is bound to happen. The ORVR is a filter system that keeps evaporated gasoline fumes from being vented into the atmosphere. If a tank is overfilled or if the purge valve that opens and closes the system goes bad, liquid gas gets into the canister and ruins it, resulting in the gasoline smell you describe.
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