5thgenluder Posted July 11, 2010 Share Posted July 11, 2010 Hey guys Im building my fuel setup for my 1971 240z for my rb25det swap in progress. So far this is my plan. I plan to use a 3/8th right angle to -6an fitting. Connect that fitting to my high flow in-line fuel filter. From the filter im going to my bosch 044 pump. From pump to another high flow in-line fuel filter. From there im gonna connect to my 3/8th hardline to the engine bay. I plan to put the return line into the factory fuel outlet. How does this sound? Do I need the factory expansion tank? Im not quite sure what its for. If I do need the expansion tank what do I do with the Breather tube that went to the carbon canister? If I dont need it can I just weld up all the other bungs? My tank also has a lot of rust on the inside. Heres a pic of what I havent shaken out yet. I plan to clean it out I bough Eastwoods fuel tank clean kit. Quote Link to comment Share on other sites More sharing options...
5thgenluder Posted July 11, 2010 Author Share Posted July 11, 2010 So upon about 2 hours of forum reading I figured out I need a vent tube. I don't have my factory carbon canister. What should I do to vent the fuel tank? What are the rest of you rb guys doing? Quote Link to comment Share on other sites More sharing options...
motoman Posted July 11, 2010 Share Posted July 11, 2010 I'm doig the same swap as you and i'm just useing the vapor tank for venting. I'm running the hose the comes of the filler neck and the two from the main tank. I'm getting the other two welded up. The one from the carbon canister and the small one that is coming of the top of the main tank Quote Link to comment Share on other sites More sharing options...
5thgenluder Posted July 11, 2010 Author Share Posted July 11, 2010 I'm not sure I'm following you. Where does the pressure release. Without the charcoal canister the vapor tank will not be able to vent the pressure. Are u saying the little bit of volume that the expansion tank provides is enough to overcome the pressure of a full tank on a hot day? Quote Link to comment Share on other sites More sharing options...
goodoldjam Posted July 11, 2010 Share Posted July 11, 2010 (edited) Throw all of it away and vent from the cap. Are you using the stock 240 tank? You know it's not baffled right, you may want to add in a surge tank or pick up a 280z tank Edited July 11, 2010 by goodoldjam Quote Link to comment Share on other sites More sharing options...
5thgenluder Posted July 11, 2010 Author Share Posted July 11, 2010 Yes I am using the stock 240 tank. I want to do basic right now. I do plan to add a surge tank next year when I upgrade the motor. My concern is that I park the car in a small shared garage and don't want any gas smell. Does the vented cap cause any bad odor? I might just pick up a small charcoal canister and tuck it up near the tank. Quote Link to comment Share on other sites More sharing options...
goodoldjam Posted July 12, 2010 Share Posted July 12, 2010 (edited) Yes I am using the stock 240 tank. I want to do basic right now. I do plan to add a surge tank next year when I upgrade the motor. My concern is that I park the car in a small shared garage and don't want any gas smell. Does the vented cap cause any bad odor? I might just pick up a small charcoal canister and tuck it up near the tank. I have a couple trucks that are vented and I don't really notice a odor. Thing that maybe a concern is that the charcoal canister is a temporary stop for the fuel vapor and the vapors are sucked out when the engine is running. I don't know if the canister will work as a odor controller. http://www.familycar.com/classroom/emission.htm This is a good link for the function of the canister under EVAPORATIVE CONTROLS. Edited July 12, 2010 by goodoldjam Quote Link to comment Share on other sites More sharing options...
5thgenluder Posted July 12, 2010 Author Share Posted July 12, 2010 Well a vented cap seems to be the easiest way to do it. I can t all te hoses that to to the expansion tank and run them to the hose that goes into the filler neck and get a vented cap. 1 more question both of the filters are high flow 40 micron filters will that be ok? Quote Link to comment Share on other sites More sharing options...
goodoldjam Posted July 12, 2010 Share Posted July 12, 2010 Well a vented cap seems to be the easiest way to do it. I can t all te hoses that to to the expansion tank and run them to the hose that goes into the filler neck and get a vented cap. 1 more question both of the filters are high flow 40 micron filters will that be ok? I'm not a expert I can only tell you what I've read. 30 micron and under before the injectors and 40 micron is fine before the pump. Quote Link to comment Share on other sites More sharing options...
5thgenluder Posted July 12, 2010 Author Share Posted July 12, 2010 ok so you have me concerned about the stock tank not having any baffles. Heres what Im thinking will be the best/cheapest solution for me. I already have the stock tank off and cant weld so I have to have someone plug the stock return and all the vent tubes. I might as well take it to a radiator shop and have them boil it seal it and weld this guy on there. What do you guys think? is this a good permanent solution? I might as well do something I wont be changing next year. If any of you guys have experience with this setup how low will it hang and is it a huge eyesore? Is there any issues with legality having this thing hanging down from the stock tank? Quote Link to comment Share on other sites More sharing options...
rossman Posted July 12, 2010 Share Posted July 12, 2010 You might want to try Moyer Fuel Tank Renu. I got the idea from this thread. It isn't cheap but the work is high quality. Quote Link to comment Share on other sites More sharing options...
5thgenluder Posted July 13, 2010 Author Share Posted July 13, 2010 ok Im not loving the look of a sump. I think ill just do a surge tank. I found this online. Im ordering this tomorrow and just curious what is a good/ cheap low pressure pump. I have read about a few carter pumps but no model #s. I am running a bosch 044 for my high pressure pump. Thanks again James Quote Link to comment Share on other sites More sharing options...
motoman Posted July 13, 2010 Share Posted July 13, 2010 Yah just put a vented cap for when the pressure gets to great. And when its not it will just go to the vapor tank when it is cooler and not in use. Also if your out on a hot summer day you will most likly have to car out side. Here is a link of what i'm planning on doing to my tank http://picasaweb.google.com/rb240z/20070407FuelTankMod# Quote Link to comment Share on other sites More sharing options...
5thgenluder Posted July 13, 2010 Author Share Posted July 13, 2010 Ok. I'll keep the vapor tank and get a vented cap. Thanks for the advice. Ordered the surge tank. Still no luck on the low pressure pump. Found a Carter 4070 but it only has 1/4" not fitting on it. I'd prefer something with -6an. And I still have the hardest challenge. Finding a place for all this stuff. Quote Link to comment Share on other sites More sharing options...
goodoldjam Posted July 13, 2010 Share Posted July 13, 2010 Ok. I'll keep the vapor tank and get a vented cap. Thanks for the advice. Ordered the surge tank. Still no luck on the low pressure pump. Found a Carter 4070 but it only has 1/4" not fitting on it. I'd prefer something with -6an. And I still have the hardest challenge. Finding a place for all this stuff. 1/4" NPT is -6 isn't it? Quote Link to comment Share on other sites More sharing options...
5thgenluder Posted July 13, 2010 Author Share Posted July 13, 2010 1/4 is 4/16th. -6 is 6/16th. Or 3/8 npt. Is what I thought. Quote Link to comment Share on other sites More sharing options...
goodoldjam Posted July 13, 2010 Share Posted July 13, 2010 (edited) 1/4 is 4/16th. -6 is 6/16th. Or 3/8 npt. Is what I thought. I think were getting confused with OD and ID. 1/4" NPT is .54" OD and -6 is 3/8 id hose. I have a fuel rail that is -6 and uses 1/4" NPT fittings. It confuses the hell out of me. The barbed fittings I have connect to 5/16 id hose. You can have a 1/4" NPT to 3/8" barbed fitting. http://www.westmarine.com/1/1/7368-1-4-npt-x-3-8-brass-hose-barb.html I had to look up NPT, but you can see how large a 3/8" NPT is. http://en.wikipedia.org/wiki/National_pipe_thread Edited July 13, 2010 by goodoldjam Quote Link to comment Share on other sites More sharing options...
rossman Posted July 13, 2010 Share Posted July 13, 2010 (edited) AN fitting sizes correspond to the OD of the tube/hose. The thinner the wall thickness the larger the ID and vice versa. Edited July 13, 2010 by rossman Quote Link to comment Share on other sites More sharing options...
goodoldjam Posted July 13, 2010 Share Posted July 13, 2010 (edited) I think I have the same Carter pump your looking at. It has 1/4" NPT to 3/8" barbed, feeding triple Webers. I think it's the pump your looking for given it flows enough for whatever your trying to do. Edited July 13, 2010 by goodoldjam Quote Link to comment Share on other sites More sharing options...
5thgenluder Posted July 13, 2010 Author Share Posted July 13, 2010 Thanks guys. I am/was very confused. I was definately Mixed up About diameters. I'm ordering the pump now. Quick question if this is a 1/4 npt which is the same as -6 can I just attach my stainless steel braided cable to the fitting and hose clamp it on? Quote Link to comment Share on other sites More sharing options...
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