luvmy280zxt Posted August 24, 2009 Share Posted August 24, 2009 Im in the process of getting rid of my emissions stuff. I pulled out the carbon filter canister and was wondering, what should i do with the vent line? Capp it off? remove it. Oh this is on my 81 zxt. Quote Link to comment Share on other sites More sharing options...
zxtman Posted August 24, 2009 Share Posted August 24, 2009 Don't cap the fuel vent line. Remove the rubber hose that connects the fuel vent hard line to the carbon canister. Place a small filter/breather on the end of that hard line. Quote Link to comment Share on other sites More sharing options...
lumberjackj Posted August 25, 2009 Share Posted August 25, 2009 Wont venting this into the engine bay potentially lead to fuel vapors in the compartment? Quote Link to comment Share on other sites More sharing options...
zxtman Posted August 25, 2009 Share Posted August 25, 2009 Wont venting this into the engine bay potentially lead to fuel vapors in the compartment? Yes, but if your so concerned about fuel vapors, why are you "getting rid of my emissions stuff"??? Quote Link to comment Share on other sites More sharing options...
Daniel13brx7 Posted August 25, 2009 Share Posted August 25, 2009 exactly what zxtman is saying, if its a concern dont remove it. Or you can possibly go through the hassle of just removing the line further back. Are you just cleaning up the engine bay luvmy280zxt? Quote Link to comment Share on other sites More sharing options...
RUZN Posted August 26, 2009 Share Posted August 26, 2009 I just did the same thing and left line pointing downward no issues with Fuel smell to small a hole to really ramp up the smells I guess Quote Link to comment Share on other sites More sharing options...
stravi757 Posted August 26, 2009 Share Posted August 26, 2009 could you run a line directly from the hard line to the intake manifold to just lose the canister? Quote Link to comment Share on other sites More sharing options...
RUZN Posted August 26, 2009 Share Posted August 26, 2009 I was thinking that but then I thought well wouldnt the vacuum suck fuel through that hose or worse create to much Vac pressure in Tank and crush it? no idea... but I just left it with the rubber line kinda beside the coolant bottle pointing downwards so no crap gets in Quote Link to comment Share on other sites More sharing options...
luvmy280zxt Posted September 1, 2009 Author Share Posted September 1, 2009 Well Im just cleaning up the bay a little by little. I finally received all of my I/C set up stuff and i want as much room as possible so the install will not be a pain in the a$$. Plus Since I've gotten rid of most of my emission stuff it feels like I freed up some hp. The car seems to run a little stronger. I also just installed my manual boost control. Amazing how much of a difference the car pulls at 10 psi of boost. I'm very impressed!! As for the fuel vent line, I bought a gun cleaning kit and took the metal reamer out of it and cut it down and inserted it into a 1 inch long piece of rubber tubeing to make a small filter to put over the line. It seems to be working quiet well. Ill just pull it out once a month to clean it up. Quote Link to comment Share on other sites More sharing options...
danriem Posted November 29, 2009 Share Posted November 29, 2009 yea don't run the vent line back into the intake... I did this, started my car and in like 3 min. i heard crunching sounds and my fuel tank became partially imploded.. not good Quote Link to comment Share on other sites More sharing options...
luvmy280zxt Posted December 4, 2009 Author Share Posted December 4, 2009 Wow, not good. Did you have to replace the tank? Quote Link to comment Share on other sites More sharing options...
KnightoftheRound Posted December 4, 2009 Share Posted December 4, 2009 I deleted my CC, and ran the vent line originally going to the canister, to a 240Z fuel filter, and then from the filter, straight down. Seems to work fine, haven't had any fuel smells that I recall. Quote Link to comment Share on other sites More sharing options...
danriem Posted December 6, 2009 Share Posted December 6, 2009 no i didn't replace the tank i just ran a blowgun off my compressor to a rubber tube back into the vent line and popped it back out. worked ok. Quote Link to comment Share on other sites More sharing options...
oldschool2 Posted December 6, 2009 Share Posted December 6, 2009 There is a Fuel Vent/Vapor Check Valve between the Fuel Tank and the Carbon Canister. Yours may have been removed. This check valve controls the Fuel Tank Pressure (pressure in the tank). If you have a check valve it may be a two or three prone configuration. Later 280ZX cars seem to have the two prong (in out only). Quote Link to comment Share on other sites More sharing options...
jeffp Posted January 6, 2010 Share Posted January 6, 2010 I realize that there are a few people who advocate removal od the air purge setup on the cars. The 280zx car really should have the system in place and working. The purge canister not only removes the raw fuel smell, but more importantly it pressurizes the fuel tank. Not such a big deal, except for the fact that the zx system has a gravity feed to the inlet of the fuel pump. The positive pressure helps to force the fuel into the fuel line and puts a slight pressure on the pump inlet. The system aides the pump fuel delivery along with the emissions stuff. My recommendation is to keep the system and work around its location with your intercooler setup. The delivery may work good or it may not, but you will never know unless you have the ability to monitor the pump output, not just the fuel pressure, but also the air that could be pumped along with the fuel, that is bad, you will never be able to tune the car and it will not run consistantly if that happens. I am all for pressurizing the fuel tank, removing the slight emissions the system provides. Run -4 steel braided lines to and from the tank and it will look really good. I did this upgrade on my car and have never had to mess with it again. Quote Link to comment Share on other sites More sharing options...
oldschool2 Posted January 8, 2010 Share Posted January 8, 2010 While searching for the cause of excessive fuel tank pressure, I was able to get rid of "all" pressure in my 1982 280zx non-turbo. One hot Vegas day I was at wide-open-throttle (WOT), and had a total "flame-out." The car apparently lost fuel to the injectors and died. Eventually, I found that the problem with excessive fuel pressure was an in-line non-functional fuel-check-valve. I replaced the fuel check valve, put everything back to stock configuration, and had no more flame-outs. Quote Link to comment Share on other sites More sharing options...
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