Fuel return
03-13-2009, 05:46 PM
#1
Fuel return
I decided to build my own fuel return system and have a few questions. Through searching I found this page: http://liljerk.morpheus.net/350Z/fuel_pump_install/
It is informative and it is what I had in mind.
Now to the qestion. I found this picture:
http://zchickz.com/fuel16.jpg
Where does the line go to from the bulk head? Back to the fuel pump? This is the only thing that I can't figure out, everything else is very simple. I will have a full DIY thread on a fuel return, so look for it in the future.
Also, what is the best place to get the fuel rail adapters?
EDIT: After looking at some FRS pics in the AAM manual, it looks like the return line goes straight back to the fuel pump. Is this correct?
It is informative and it is what I had in mind.
Now to the qestion. I found this picture:
http://zchickz.com/fuel16.jpg
Where does the line go to from the bulk head? Back to the fuel pump? This is the only thing that I can't figure out, everything else is very simple. I will have a full DIY thread on a fuel return, so look for it in the future.
Also, what is the best place to get the fuel rail adapters?
EDIT: After looking at some FRS pics in the AAM manual, it looks like the return line goes straight back to the fuel pump. Is this correct?
Last edited by BoostedProbe; 03-13-2009 at 07:57 PM.
03-14-2009, 04:37 AM
#5
the return line should most likely be used to operate your siphon jet when the fuel returns to the tank.
this is where you are going to run into problems on a DIY setup. most of the companies who make these fuel return kits include a machined adapter to connect the fuel return line to the siphon jet so that you can still pull fuel from the driver side saddle
this is where you are going to run into problems on a DIY setup. most of the companies who make these fuel return kits include a machined adapter to connect the fuel return line to the siphon jet so that you can still pull fuel from the driver side saddle
03-14-2009, 07:30 AM
#7
interesting. that how-to link you posted has the fuel returning to the non-fuel pump side. completely different than that 2nd pic you posted where the fuel is returning to the fuel pump side.
2 different setups, thats why they pics dont match up.
ya running the fuel line from the tank to under the car is a HUGE hassle.
2 different setups, thats why they pics dont match up.
ya running the fuel line from the tank to under the car is a HUGE hassle.
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03-14-2009, 07:49 AM
#8
Yes this: http://liljerk.morpheus.net/350Z/fuel_pump_install/ link doesn make much sense. The stck FPR is taken out and replaced with a plug?
I am going to the garage to take the pump basket out, and hopefully things make more sense.
As far as installing goes, I am not worried about it. If I can build a complete turbo kit, a FRS should not give me much trouble.
I am going to the garage to take the pump basket out, and hopefully things make more sense.
As far as installing goes, I am not worried about it. If I can build a complete turbo kit, a FRS should not give me much trouble.
03-14-2009, 08:07 AM
#9
that link makes sense. its returning fuel to the other side of the tank. prolly doesnt matter which side it returns to. You would use that solid regulator/ or the holllowed out one included in like the CJ kit, since fuel pressure is controlled by the aeromotive FPR in the engine bay.
fabbing a RFS is simple, running a 1" diameter braided line thru a 3/4" wide slot is the fun part.
fabbing a RFS is simple, running a 1" diameter braided line thru a 3/4" wide slot is the fun part.
03-14-2009, 09:16 AM
#10
Your fuel rail adapters: http://www.cj-motorsports.com/catflaf.htm
that will bolt to the back of each rail.
the long how to you posted is super old school and out dated, that is before there were fully functional return systems available.
reference this for all the modification you make to the fuel pump housing:
http://www.cj-motorsports.com/342install.htm
and also reference this: http://www.cj-motorsports.com/s1install.htm
part 2: fuel pump modification and installation - this will show you how to properly convert the assembly for return fuel. now its based on using the CJM return fuel correction kit, which is included in all the fuel systems... but if you have the ability to lathe your own part, then from looking at this you should be able to tell what is going on and contruct it yourself.
http://www.cj-motorsports.com/catrck.htm
between all those links, all the info you need should be there!
good luck.
that will bolt to the back of each rail.
the long how to you posted is super old school and out dated, that is before there were fully functional return systems available.
reference this for all the modification you make to the fuel pump housing:
http://www.cj-motorsports.com/342install.htm
and also reference this: http://www.cj-motorsports.com/s1install.htm
part 2: fuel pump modification and installation - this will show you how to properly convert the assembly for return fuel. now its based on using the CJM return fuel correction kit, which is included in all the fuel systems... but if you have the ability to lathe your own part, then from looking at this you should be able to tell what is going on and contruct it yourself.
http://www.cj-motorsports.com/catrck.htm
between all those links, all the info you need should be there!
good luck.
03-14-2009, 09:23 AM
#11
to simply convert to a RFS with stock rails, there is really nothing to it. You can just use the adapter i linked on the back of the driver side rail, run a small -6 line to a regulator, run a -6 line to the fuel pump assembly, and then into the return correction kit that you can either purchase or make. very simple!
03-14-2009, 09:42 AM
#12
phunk: Thank you very much, you have saved my day. The link I posted is indeed old, I think it dates to early 2004.
Rally apreciate the links to cj.motorsports, I was acutally looking to buy that part/hose/adapter that goes in the tank, but thought if need be I can make it. For $75 I won't bother making it, I just hope you ship to Canada.
PM me with a price for 2 shipped.
Thanks again.
Rally apreciate the links to cj.motorsports, I was acutally looking to buy that part/hose/adapter that goes in the tank, but thought if need be I can make it. For $75 I won't bother making it, I just hope you ship to Canada.
PM me with a price for 2 shipped.
Thanks again.
Last edited by BoostedProbe; 03-14-2009 at 09:53 AM.
03-14-2009, 09:59 AM
#13
we are actually machining the regulator replacement plugs as i type this! we had ran out of them this week. they will be at the anodizer on monday and ready to go a couple days after that. unanodized could ship immediately if you were in a rush.
canada is no problem, i would probably use USPS for that, or whatever it is you requested/works best should you decide to purchase something.
feel free to contact me any time for parts or DIY assistence.
canada is no problem, i would probably use USPS for that, or whatever it is you requested/works best should you decide to purchase something.
feel free to contact me any time for parts or DIY assistence.
03-14-2009, 11:01 AM
#15
Charles sent several things to South Korea to save my @$$, so Canada shouldn't be a problem! 
Why bother hassling with fuel return system when there are several very good products on the market for a great price?? Just order everything from CJM. Less headache...
Why bother hassling with fuel return system when there are several very good products on the market for a great price?? Just order everything from CJM. Less headache...
03-14-2009, 11:05 AM
#16
Why not? People said the same thing when I set out to build my own turbo kit. On the turbo kit I saved about $3000, maybe that money could be put towards a short block..same thing with the fuel return. If I can build it myself for about $250, I save $250.
03-15-2009, 03:17 PM
#18
Something else that has been bugging me with regards to the stock fuel dampers. After some research I now know what they are and what the purpose is.
When they (fuel dampers) are removed while installing a FRS, I am assuming that the FPR takes care of the the "shock absobing" in the fuel system, retaining smooth flow.
When they (fuel dampers) are removed while installing a FRS, I am assuming that the FPR takes care of the the "shock absobing" in the fuel system, retaining smooth flow.
03-15-2009, 07:14 PM
#20
dampers are typically prevalent in returnless cars... i have seen some dampers in oem return systems... but in years and years of application after application running without dampers, it doesnt seem to cause any noticable disadvantage.
if you for some reason encounter pressure chatter, you can easily add some aftermarket dampers that are available with AN style fittings on it... but you would be in a very small club, and probably the founder around these parts.
i am not sure if the regulators we use are considered to to be a damper also.. but i do have several hundred customers and no one has reported issues with chattering pressure, so perhaps they do!
if you for some reason encounter pressure chatter, you can easily add some aftermarket dampers that are available with AN style fittings on it... but you would be in a very small club, and probably the founder around these parts.
i am not sure if the regulators we use are considered to to be a damper also.. but i do have several hundred customers and no one has reported issues with chattering pressure, so perhaps they do!