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How does the fuel vapor line work? (carb vs. efi)?
Hi. I swapped an EFI motor into my 1985 Toyota Corolla which had a carbed motor. Well, I've been driving it but per recommendation I'm switching to the EFI lines, which are larger. The stock carbed setup had 3 lines... fuel delivery, fuel return, and fuel vapor. Well, the person I bought the EFI lines from only had the fuel delivery and fuel return lines. Is the fuel vapor line the same?
Also, how does it work? I've heard of some people blocking them, although that doesn't seem like a smart idea.
Also, how I have my car setup now, if I tighten the gas cap all the way gasoline comes gushing out of the fuel vapor line (which I had open to the atmosphere).. any ideas why that's happening?
Anyway, I'm going to go ahead and switch the delivery and return lines but would like your input on what to do with the vapor line. It's sort of a race car and doesn't get driven much so emmissions aren't an issue at all. Thanks! -Stu
This is the EVAP system which you can get a better understanding of at www.howstuffworks.com The system is designed to maintain a certain pressure in the tank at all times. The gas cap has a pressure activated vent in it. This explains why your vapor line pushes fuel out if the cap is tightened. The fuel and tank heat up and expand causing pressure. The open line is the easiest path out. Now you need to have the actual vapor canister and valves installed and plugged in. The ECM is what controls when to vent the tank into the intake manifold. The carbed system I believe just used a vacuum operated switch/valve. i am not positive on your car. Although the computer will always be looking for that system and it may effect your air/fuel ratios not having it, you can get a open vented gas cap for it and plug that line. Either way you need to be VERY sure that it is sealed whether plugged or connected. Otherwise you are filling the engine compartment with fuel vapor which WILL explode with any ignition source. i.e. a leaking plug wire, shorting wire, rock kicked up from the road, you name it.
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