datsunlover Posted March 19, 2004 Share Posted March 19, 2004 Ok, sorry for being ignorant... I just don't know alot about carbs. I'm trying to figure out how to hook up the fuel lines to my twin SU's; Obviously the line coming from the pump goes to the outer-most inlet on the bowl. What do I do about the other inlet/outlet beside it?!? It's just a straight through line into the float bowl.. I was thinking I should run these back to the tank via the return line, but a friend of mine says NO they are just a vent and I should run a line out of the engine bay and just dump under the car somewhere.. if I return them to the tank, the tank could presurize back through the line and cause problems. What's the deal here? Can someone enlighten me? Quote Link to comment Share on other sites More sharing options...
Dayz Posted March 19, 2004 Share Posted March 19, 2004 I' ll Take a picture for you tomorow, my ontario friend !!!! Erik Quote Link to comment Share on other sites More sharing options...
datsunlover Posted March 19, 2004 Author Share Posted March 19, 2004 Hey, cool man! Seems like more and more ppl I see on here are from Ontario.. Good stuff! Just wondering.. is your setup factory/stock, or something you retrofited on? (in my case I'm converting a 75 FI to 72 carbs) Thanks. Quote Link to comment Share on other sites More sharing options...
Dayz Posted March 19, 2004 Share Posted March 19, 2004 Ok, there is a little diff between those carbs. for70-72 see this: http://hybridz.org/nuke/modules.php?op=modload&name=coppermine&file=displayimage&album=2&cat=0&pos=1 the others vents are all vaccuums and the engine won't run if you dont route them. If you need more just tell me, I'll give you a vacuum diagram. Dayz Quote Link to comment Share on other sites More sharing options...
datsunlover Posted March 20, 2004 Author Share Posted March 20, 2004 Thanks for the link to the pics man.. that helps me out, but Im still a little confused on the vacum line routing...What's that big line coming out of the middle of the intakes and going under them? If you could post a vacum diagram that would be great. Thanks Quote Link to comment Share on other sites More sharing options...
Dayz Posted March 22, 2004 Share Posted March 22, 2004 Just wondering what kind of carbs you have, the early ones or the late ones. The vaccuum line you are refering to is the crank case vent ( left in front of the block) If you need some manual shop tell me, I have an Haynes and another one with no name that I could sell to you for little. Dayz Quote Link to comment Share on other sites More sharing options...
datsunlover Posted March 24, 2004 Author Share Posted March 24, 2004 Well, I might take you up on that offer.. I have the FSM for my car, but seeing as it's for a 75 it says nothing about carbs. I think I'll get it together, but it'll be a little while before I can get to it. This stupid winter thing won't get lost, so I'm in 'hurry up and wait' mode for a little while. ANd Im off to school in two weeks for april and may, so time on the Z will be limited for the next little while Oh well. I'll get back from school, and it'll be summer. Then I can throw all these parts on (that I've been hiding away..) and DRIVE the stinkin thing! Quote Link to comment Share on other sites More sharing options...
datsunlover Posted March 31, 2004 Author Share Posted March 31, 2004 Bringing thos post back, because I have another question about these carbs; Here is what I am planing to do. Use the stock (75 280z) fuel line from the pump to the engine bay. (do I need that 'fuel damper' with carbs?) At the engine, this feed line splits into 3; one towards the firewall, one towards the rad, one out towards the intake. I was thinking of feeding the carbs with the first two, and using the last one (pointing towards the intake) unto a fuel presure guage, then to the stock return line back to the tank. I think this will work.. but what do you ppl think? Is this dangerous or not a good plan? Quote Link to comment Share on other sites More sharing options...
ZR8ED Posted April 1, 2004 Share Posted April 1, 2004 Uhh I think you need to look at those fuel lines again.. One is the fuel from the tank. the other is a fuel return, and the third?...uh maybe a vent line for the charcoal canister???...I can't remember off hand.. Quote Link to comment Share on other sites More sharing options...
datsunlover Posted April 1, 2004 Author Share Posted April 1, 2004 Ok I have to clarify this: I am talking about the fuel feed line that wraps around the front of the valve cover. (it's actually a feed and return line running together on a couple brackets) About half way down the other side of the valve cover, it becomes the stock FI line, and does all those crazy u-turns and twists (to get to the injectors, presure thingy, and then out to a return) BUT just as it splits all up, there is a piece that is like a "T" fitting, and it basicaly splits the fuel line into 3. (one goes towards the rear, one towards the front, and one outwards) It is all the SAME fuel line. I just figured I could use it to feed both carbs, and go through a presure guage before going to a return. Does this make more sence now? I just don't know if it's a 'safe' way to do things... Oh, I'm still wondering about that fuel 'damper'.. it's above the stock fuel pump, in line.. do I need it? Or can I take it out of the system? Quote Link to comment Share on other sites More sharing options...
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