dfoxengr

what is the point and technically how is it done?

do you need a FPR put somewhere else with this method?

dfoxengr

bump?

RenoRacing

I haven't heard much of any benefits from them, I know that the newer civics/rsx's have them but when swapped into other chassis(EG/EK) I believe they change that to a return setup. I did notice this setup the other day on HoustonSi's car, don't know any details, here's the link to a picture of it though.
looks odd!
https://honda-tech.com/zerothread?id=722708

dfoxengr

thats a link to log manifold post...?

Del_Slowest

thats the pic he wants you to look at .....

dfoxengr

oh so basically the FPR is moved upstream of the rail, and the other end of the rail is plugged.

do you have to use an inline pump?

baphomet

Are you sure that is return less?

hpfsi

There is still a return line, but if that setup works fine then why not just put the filter and regulator back by the tank right after the pump and all but do away with the return line? Sexy engine bay though

XSIintegra

By the looks of it, the return line may be right below the regulator that is attached to the firewall. As hpfsi mentioned, the system would be cleaner and just as effective if the line is regulated before it hits the rail.

baphomet

I see, but I thought we were speaking of return-less fuel systems. Admittingly I know nothing about the subject, but even if you put the fpr at the tank it would still 'return' the excess fuel. Is that all it is?

I thought on the newer cars the pump works less/more depending on pressure needs.

RenoRacing

I'm not sure, that system just looks unusual to me, it does have a return line on the bottom of the regulator but the feed is a straight through design which is unusual. I believe returnless systems have a rpm dependent voltage supplied to the pump and raises pressure/amount as needed.

XSIintegra

Well, I know this doesn't count, but my Suzuki Samurai has a returnless fuel system (I do believe). It has a mechanical fuel pump w/ a single inlet and outlet. Inlet is from the tank and outlet is to the carb, although the carb is internally regulated.

leadfoot78

I used to own a 2001 civic and I know that had a returnless fuel system. The only thing I remember about it is that it made putting a turbo on the car alot more difficult. Some people converted to a system with a return line and some waited for the turbo kits from Greedy and others. The companies making the kits took a long time to come out with the turbo kit's cuz of the fuel system.

dfoxengr

weird, but are there advantages disadvantages of returnless? and is it technically just plugging up the return line?

leadfoot78

Only fuel economy and emissions would benefit from some thing like that. It's just a pain in the ***, that 2001 Civic was a pain in the *** to work on, from turbo to putting in speakers and stereo it was a pain in the ***. Thats why I drive an EG now and I would never go back.

dfoxengr

ok thanks.

dfoxengr