jazzsax Posted October 7, 2008 Share Posted October 7, 2008 Whenever I fill up at a gas station I get raw gas fumes inside the car ('71 240). If I drive for about 20 miles the fumes seem to disappear. If I don't fill past about 3/4 of a tank there are no fumes. I know up in the rear quarter panel there is some kind of an overflow tank so I am thinking the hose connecting the fuel tank to the overflow may be at fault. OR might there be something else I could check to correct the problem. Maybe the filler hose? Do I need to lower the gas tank to check these out???? Any help appdreciated. Quote Link to comment Share on other sites More sharing options...
jerryb Posted October 7, 2008 Share Posted October 7, 2008 Gas fumes in in a 240! Cant imagine.........:lmao: Go behind the rear passenger side interior panel and check all the hoses going to that plastic container you mention. Incluing the filler hose to the tank. You answered your own question and are on track to fixing the problem.... Quote Link to comment Share on other sites More sharing options...
1 tuff z Posted October 7, 2008 Share Posted October 7, 2008 there are a few hoses on your tank [go to the vapor tank and filler neck]. best move is to run the tank close to empty, jack up car, pull drain plug and donate remaining gas to your lawn mower. carefuly drop the tank, taking note of what hoses go where [assuming you don't have a factory service manual or fuel / vapor line diagram]. then measure and replace all the vapor lines from tank to vapor tank and filler neck. don't use anything but fuel rated hose [like i did the first time] otherwise you wind up doing it again in a few years. also be careful when installing the tank so you don't pinch any of the new hoses. this will fix your raw fuel vapor problem. Quote Link to comment Share on other sites More sharing options...
janaka Posted October 7, 2008 Share Posted October 7, 2008 Gas fumes in in a 240! Cant imagine.........:lmao: that was my first reaction too... I thought that was part of the cars attraction when I got mine. Good luck tracking down your source of leakage Quote Link to comment Share on other sites More sharing options...
atomflatz Posted October 7, 2008 Share Posted October 7, 2008 This guy removed the vapor tank and most of the lines associated with it. Is this a good idea or could it create problems? http://www.sonic.net/~kyle/cars.html Quote Link to comment Share on other sites More sharing options...
jerryb Posted October 7, 2008 Share Posted October 7, 2008 You can do but make sure the tank is vented in some fashion. Otherwise its like sucking on an empty plastic bottle. This guy removed the vapor tank and most of the lines associated with it. Is this a good idea or could it create problems? http://www.sonic.net/~kyle/cars.html Quote Link to comment Share on other sites More sharing options...
EvilC Posted October 7, 2008 Share Posted October 7, 2008 At the convention I realized that my vent tube was filling with gas when I was over filling the tank. The tube was broken and gas was spilling right into the car. Nothing like finding out about that after auto-crossing and seeing smoke starting inside the back of the car Carefully check your lines from the e vap tank and also make sure your emblems on your pillar are turned the right way and venting is taking place. Clive Quote Link to comment Share on other sites More sharing options...
jazzsax Posted October 8, 2008 Author Share Posted October 8, 2008 Holy C**p I took the right rear plastic panel off to access the overflow tank. What a maze of tubes! That being said, all of the hoses look to be OK with the exception of the grommets that seal the hoses that go from the rear deck to under the deck. Could these grommets allow gas vapor into the interior? thanks Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted October 8, 2008 Share Posted October 8, 2008 No. The vapor should all be contained in the tank and hoses. Those grommets are "weather seals". They will allow EXHAUST GAS into the car and FUEL VAPOR into the car only IF the fuel vapor is escaping from the tank somehow. Quote Link to comment Share on other sites More sharing options...
atomflatz Posted October 8, 2008 Share Posted October 8, 2008 It is a mess isn't it. Kind of why I was tempted to remove it before a problem develops. Quote Link to comment Share on other sites More sharing options...
jerryb Posted October 8, 2008 Share Posted October 8, 2008 Double check the T coming off the filler hose to one of the vapour hoses. Its low enough that gas will splash up and run into the car if the tank is full. It happened to me. Also, with the panel off go fill right up and go for a drive. if there is a leak of any size you should be able to see it, It has to be there some where if the fumes are that strong. Quote Link to comment Share on other sites More sharing options...
Nigel Posted October 9, 2008 Share Posted October 9, 2008 Holy C**p I took the right rear plastic panel off to access the overflow tank. What a maze of tubes! That being said, all of the hoses look tobe OK with the exception of the grommets that seal the hoses that go from the rear deck to under the deck. Could these grommets allow gas vapor into the interior? thanks Just because the hoses "look" ok, and the clamps may be tight, the rubber can be so old and dried out that it no longer seals on the hose nipple... Nigel '73 240ZT Quote Link to comment Share on other sites More sharing options...
visatrade240z Posted October 11, 2008 Share Posted October 11, 2008 Umm, Im kinda a newbie when it comes to this kind of stuff... I'm assuming a 1972 240z tank can't be autofilled by the pump, correct? also, where are these hoses located, do I have to remove the interior pannel or do I have to somehow remove the exterior rear quarterpannel? Quote Link to comment Share on other sites More sharing options...
Guest Ruthlessz Posted October 11, 2008 Share Posted October 11, 2008 I'd go with the interior panel, and yes the tank can be auto filled even with the CA, vapor recovery nozzles On the original subject I had the same problem with mine, and had the fuel pouring onto my deck. Now that I have that fixed I have found that I have a few rotten (or the lack of) seals in the firewall that allows vapors from my leaky SU carbs to seep in. Quote Link to comment Share on other sites More sharing options...
1 tuff z Posted October 11, 2008 Share Posted October 11, 2008 i would drop the tank and do the job right. you'll find that on the tank there are multiple vent hoses of varying diameters & lengths. once removed, find fuel rated hose, replace them all and you'll then be certain that it won't need to be done again for many years to come. also, most 'shade tree' mechanics, that replaced many of these hoses in the past used heater hose, which-would eventually become harder, brittle and then crack. this is most likely your source. Quote Link to comment Share on other sites More sharing options...
jazzsax Posted October 11, 2008 Author Share Posted October 11, 2008 The left rear panel is removed and early next week I will gas up and try to find the leak. Another symptom that I failed to mention is that if I drive after refueling the furms greatly decrease after about 20 miles. I hope that means the leak is higher up in the system. Also when overfilling there is raw fuel dripping on the ground below the filler but from in the fender area. All ideas still appreciated. Quote Link to comment Share on other sites More sharing options...
jerryb Posted October 12, 2008 Share Posted October 12, 2008 I go back to my previous sugestion...check the plastic fillertube...the tube that goes between the filler cap and the gas tank..is it cracked....is it clamped on?...etc Do the basics...if its leaking look for the spots its coming from. Try to help your self.... Quote Link to comment Share on other sites More sharing options...
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