dnatoli Posted March 11, 2013 Share Posted March 11, 2013 Im in the very slow process of getting an s2 rb25 into my 72 240. Very slow because of work and my BT audi slid into a pole and ive been recovering from that so I havent really been able to move in the ways required to work on cars. But anyway, I try and avoid posting threads because I usually just get some link to another page that only half answers my question or some attitude or being called a noob or something useless. When I do post these, I try and keep it really simple... My question for all of you OG rb swap goers, Would it be better to run my fuel return line into the surge tank or just simply create a spot on the factory gas tank to let the fuel run back into? I am running the baffle-less tank with an inline summit low pressure fuel pump into a surge tank which is then pulled by a walbro up to the engine. Thanks in advance, Daniel Quote Link to comment Share on other sites More sharing options...
mtnickel Posted March 11, 2013 Share Posted March 11, 2013 (edited) run return back to surge tank. Reason being, if the high pressure walbro out-flows the low pressure pump, it could drain the surge tank defeating the purpose. Though there also needs to be a return from the surge tank to the fuel tank as well...make sure this a decent size so the surge tank doesn't become pressurized. Mark Edited March 11, 2013 by mtnickel Quote Link to comment Share on other sites More sharing options...
ZT-R Posted March 20, 2013 Share Posted March 20, 2013 Only bad thing is that this heats the fuel more, with that being said, mine goes back to my surge tank and then a 8an return to the tank. Quote Link to comment Share on other sites More sharing options...
dnatoli Posted March 20, 2013 Author Share Posted March 20, 2013 thanks all, I didnt think of running a second return back to the tank. Where on the tank would it be good to route that return line from the surge tank? should I put that line into the highest point of the tank? Quote Link to comment Share on other sites More sharing options...
ZT-R Posted March 20, 2013 Share Posted March 20, 2013 Yes Quote Link to comment Share on other sites More sharing options...
wrcbonk Posted March 21, 2013 Share Posted March 21, 2013 I used the smaller of the two vent lines located on top of the tall portion of the tank for my return. This works, BUT you must make sure the larger vent line has NO kinks or you will build up pressure in the tank and in my case have a fuel volcano out the the filler. Es no bueno:( Quote Link to comment Share on other sites More sharing options...
UG-S30 Posted April 3, 2013 Share Posted April 3, 2013 does this apply to a late 260z or 280z???? Quote Link to comment Share on other sites More sharing options...
pat1 Posted April 3, 2013 Share Posted April 3, 2013 does this apply to a late 260z or 280z???? No the 280z was fuel injected to start with. The tank will have a feed and a return. The 280z tanks also have baffles. Quote Link to comment Share on other sites More sharing options...
ZT-R Posted April 3, 2013 Share Posted April 3, 2013 I think i have some stuff about mine in my build thread. Quote Link to comment Share on other sites More sharing options...
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