Lachlan Posted June 18, 2011 Share Posted June 18, 2011 I am working on putting in my 32/36 DGV. I've been able to find most hook-up info via the search button, but there's one thing I can't figure out. On the 81 Brat's EA81 there is no fuel return line to the carb, so no problem there. There is, however, a vapor recovery line that goes to the canister. On the weber, there is one (obvious) fuel-in line, but there are two plugged orifices nearby; one directly opposite fuel-in, and one around the corner. Which one of these ought to be used for vapor recovery, or does it matter? Link to comment Share on other sites More sharing options...
Suba_GL_87 Posted June 18, 2011 Share Posted June 18, 2011 http://www.ultimatesubaru.org/forum/showthread.php?t=104128&highlight=weber+carb+brat thats would might help you. 8-) Link to comment Share on other sites More sharing options...
Lachlan Posted June 18, 2011 Author Share Posted June 18, 2011 http://www.ultimatesubaru.org/forum/showthread.php?t=104128&highlight=weber+carb+brat thats would might help you. 8-) I've read that thread a few times now, and I can't pinpoint where they talk about the vapor recovery line. Could you please point it out? Link to comment Share on other sites More sharing options...
Suba_GL_87 Posted June 18, 2011 Share Posted June 18, 2011 sorry i dont have a brat. hopefully if u got a luck. I've read that thread a few times now, and I can't pinpoint where they talk about the vapor recovery line. Could you please point it out? Link to comment Share on other sites More sharing options...
Lachlan Posted June 18, 2011 Author Share Posted June 18, 2011 Anyone? Where did you hook up your vapor recovery? Link to comment Share on other sites More sharing options...
Lachlan Posted June 19, 2011 Author Share Posted June 19, 2011 I decided to try the one around the corner. So far, no ill effects. Link to comment Share on other sites More sharing options...
El Presidente Posted June 19, 2011 Share Posted June 19, 2011 Can you just plug the return and vapor line to the fuel tank? Then you can just ditch the whole vapor recovery/carbon canister system. Thats what I did on my GL. You'll need to run a vented gas cap though($3 at autozone), so the tank doesn't hold vacuum or pressure. If you don't have $3, just tear off a peice of the rubber seal on the cap so it can breath. I also yanked my EGR system to prevent idle issues and improve top-end performance. Link to comment Share on other sites More sharing options...
Lachlan Posted June 19, 2011 Author Share Posted June 19, 2011 I could, but I'm trying to minimize gas smell/maximize vapor recovery/prevent vapor lock. I don't know much about the egr system, but I hear that it helps reduce cylinder temps, which is good. When I pulled mine there was a block plate already in place, and the valve was completely clogged; but I managed to clean it up with a soak in simple green and a lot of elbow grease. Maybe later on I'll try blocking it withthe weber on and see if I can tell a difference. Link to comment Share on other sites More sharing options...
El Presidente Posted June 20, 2011 Share Posted June 20, 2011 I could, but I'm trying to minimize gas smell/maximize vapor recovery/prevent vapor lock. I don't know much about the egr system, but I hear that it helps reduce cylinder temps, which is good. When I pulled mine there was a block plate already in place, and the valve was completely clogged; but I managed to clean it up with a soak in simple green and a lot of elbow grease. Maybe later on I'll try blocking it withthe weber on and see if I can tell a difference. If you seal the vapor return line there is no gas smell, period. For years and years cars didn't have vapor return lines or carbon canisters and if you smelled gas, something was wrong. Having a carbon canister means you have a greater chance of a gas smell because of all the vapor lines that can leak. No vapor recovery=no vapors. I've never had problems with vapor lock and I don't see why you would, all the fuel lines are a ways away from any serious heat...On my GL anyway. The EGR system does slightly cool combustion temps, but not by alot and certainly not enough to be concerned about. What it does do is reduce the effective displacement of the motor by running inert gas through it at cruise. It does this for emmisions reasons. Making the motor pump inert gas reduces its efficiency/MPG's and power. Its not a huge difference, but every little bit helps. I pull the EGR systems on all my rigs because all they do is cause idle problems and reduce power and efficiency. The idle problems they cause is from when they get full of crap and don't shut at idle, if you let it go they eventually completely clog and stop working smoothing your idle back out. Just cut the EGR tube and weld a bolt in the remaining pipe fitting and put a plate on each head to block off the EGR ports. You can leave the valve off, because once those 3 holes are sealed, your good By removing both, all your doing is simplifying the motor and making it more like what a Weber is designed for, efficiency and power. Link to comment Share on other sites More sharing options...
Lachlan Posted June 20, 2011 Author Share Posted June 20, 2011 Thanks for the detailed explanation about the EGR. I would have thought that vapor recovery helps mpg by using the gas vapors for combustion rather than simply letting them vent to the atmosphere? Link to comment Share on other sites More sharing options...
El Presidente Posted June 20, 2011 Share Posted June 20, 2011 Thanks for the detailed explanation about the EGR. I would have thought that vapor recovery helps mpg by using the gas vapors for combustion rather than simply letting them vent to the atmosphere? Nope, the vapor recovery system is purely for emmisions reasons also and has no positive affect on MPG's. IIRC the EPA found out gasoline vapors contribute to smog, that's also why you see the springy seals around nozzles at gas pumps..to recover gas fumes. Ironically a lot of these emmision devices(and additives, like ethanol in gasoline) cause lower MPG's and can be the reason for many running issues, thus also lowering MPG's even more. The amount of vapors that do escape from the tank fill are very, very small and they are vented outside were fumes are almost never noticed. On a vapor recovery system the fumes are burned, but just to get rid of them. Running a vapor recovery system on a car no longer designed for it(..weberized anything) could lead to intermittent lean or rich air fuel mix problems. If you get rid of both, you'll have less problems, more MPG's and a better running motor thats easier to tune. Link to comment Share on other sites More sharing options...
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