Fuel lines/fuel return line
Fuel lines/fuel return line
I'm half way through my logistics plan for the 1uzfe swap. I'll probably replace the fuel pump in the is200 for something better. I understand I'll need a fuel return line, though I haven't got the foggiest idea why or how I go about fitting one. Apparently the 1gfe doesn't need one.
Either way... I know a few people on here have messed about with fuel systems so any help would be appreciated. Preferably with pictures if anyone has them
Cheers guys!
el_bandido
11-12-2018, 03:33 PM #1Not sure if this is in the right section... but as it feeds the engine
I'm half way through my logistics plan for the 1uzfe swap. I'll probably replace the fuel pump in the is200 for something better. I understand I'll need a fuel return line, though I haven't got the foggiest idea why or how I go about fitting one. Apparently the 1gfe doesn't need one.
Either way... I know a few people on here have messed about with fuel systems so any help would be appreciated. Preferably with pictures if anyone has them
Cheers guys!
Tells you everything you need with pics mate, that's what I'm copying anyway.
![[Image: LexuS-Copy.jpg]](http://i65.photobucket.com/albums/h204/Sparkystav/LexuS-Copy.jpg)
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.
Sparkystav
11-12-2018, 04:00 PM #2Search on my.is for 'fuel return line shopping list'
Tells you everything you need with pics mate, that's what I'm copying anyway.
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.
el_bandido
11-12-2018, 11:00 PM #4Just had a scan through that, looks like a ball ache. Am I actually going to need a fuel return line for a non boosted 1uz? Couldn't I just upgrade the pump to match the ls400 system?
if your doing all the work, its not a lot to fit a return fuel line and then its done no need to mess about.
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.
Sparkystav
12-12-2018, 04:08 AM #5My question is, why not do it.
if your doing all the work, its not a lot to fit a return fuel line and then its done no need to mess about.
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.
http://my.is/forums/f114/fuel-return-sho...st-298869/
i can copy the rest across later
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.
Sparkystav
12-12-2018, 04:10 AM #6Heres the link:
http://my.is/forums/f114/fuel-return-sho...st-298869/
i can copy the rest across later
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.
el_bandido
12-12-2018, 04:23 AM #7I read most of it this morning, thanks Stav! What advantage do I actually get from having a fuel return line, if I'm not going to boost it to huge HP. I just want about 340-350 at the crank, which the stock injectors should manage?
the stock fuel pressure regulator in the tank is set at one pressure, whereas with an adjustable one tyhe pressure can rise with the inlet pressure (although it obviously doesnt go into positive pressure)
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.
Sparkystav
12-12-2018, 04:48 AM #8They may manage the flow but only if you keep the pressure up.
the stock fuel pressure regulator in the tank is set at one pressure, whereas with an adjustable one tyhe pressure can rise with the inlet pressure (although it obviously doesnt go into positive pressure)
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.
el_bandido
12-12-2018, 05:19 AM #9Fair enough. Guess I'll put one in then! Might make the retune easier as well. I'm planning on running a link ecu, as long as it deals with vvti I shouldn't have a problem making a bit extra with some breathing/exhaust mods and a remap.
Like most modern Toyotas the VVTi 1UZ (as you know) doesn't run a return-type system. It has what Toyota refer to as 'fuel pressure pulsoides' on each fuel rail at the point where the fuel enters the rail, and the other end of the rail is capped off. The incoming fuel line is split between both pulsoides. If you're not using the stock engine management then you can whack a return line straight in (the end of the fuel rail literally unbolts). You can connect both fuel lines together around the front with 30cm of braided hose, to connect the 2 banks to each other, and then feed fuel into bank 1 and out of bank 2 to your return. Whack an FPR on the end of bank 2's fuel rail and Bob's your uncle. However if you do that on the stock management it will get mighty annoyed.
The VVTi 1UZ from the MKIV LS400 doesn't have a separate fuel pump ECU - it has the oldschool Toyota system of a fuel pump resistor and a dual output relay to either route the fuel pump voltage through the resistor (9V) or direct to the pump (12V). 3UZ uses a separate fuel pump ECU to control pump speed which becomes way more complicated if you want to swap the fuel pump for a higher speed one.
Of course all that is a bit irrelevant if you're running a Link ECU but it's all handy info!
Ahh the joys of Toyota fuel systems.
Like most modern Toyotas the VVTi 1UZ (as you know) doesn't run a return-type system. It has what Toyota refer to as 'fuel pressure pulsoides' on each fuel rail at the point where the fuel enters the rail, and the other end of the rail is capped off. The incoming fuel line is split between both pulsoides. If you're not using the stock engine management then you can whack a return line straight in (the end of the fuel rail literally unbolts). You can connect both fuel lines together around the front with 30cm of braided hose, to connect the 2 banks to each other, and then feed fuel into bank 1 and out of bank 2 to your return. Whack an FPR on the end of bank 2's fuel rail and Bob's your uncle. However if you do that on the stock management it will get mighty annoyed.
The VVTi 1UZ from the MKIV LS400 doesn't have a separate fuel pump ECU - it has the oldschool Toyota system of a fuel pump resistor and a dual output relay to either route the fuel pump voltage through the resistor (9V) or direct to the pump (12V). 3UZ uses a separate fuel pump ECU to control pump speed which becomes way more complicated if you want to swap the fuel pump for a higher speed one.
Of course all that is a bit irrelevant if you're running a Link ECU but it's all handy info!
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