Ok, so I have been looking into return fuel lines and higher hp users that are needing them. Question, why wouldnt there be a return fuel line on every car produced? Is there a downside to such? I mean, the return fuel line is just pushing back fuel that wasnt burned right? Or maybe im missing something.

 

Cheap. Keeps the fuel in the tank cooler since its not seeing the heat from engine bay and going back into tank.

Plus again its cheap and less things prone to failure!

 

I've heard theres an emissions side to it.

 

well how much fuel is actually being pushed back? i was expecting a very little - guess im wrong

 

It just helps to regulate the fuel pressure within the rail itself.

 

^ now we are talking - that makes sense why the ptuning has a pressure gauge - nows things are making more sense - ha

 

well on my system alot of fuel makes it back when im at idle i still have two pumps pushing fluid at a solid rate as i use more fuel less makes it back to the tank i have enough fuel to support 800 hp on meth in theory i run 60 psi of fuel mounted my fuel lines away from such heat and used highly insulated fuel line -10

 

^do you have any pics of your two fuel pumps and/or the return fuel line? This topic is something not highly touched on on the forum and more and more people will need to know this info as the time passes. I remember yearsss ago when 320whp was the higher number with the tC - now people are building their engines and getting 400whp+ - Evolution is crazy.

 

its a little different on a tc but i offer full builds on fuel pump assymblies from single to twin intanks walbro or bosch with -an fittings all ready for you to run your lines if your interested let me know but here is the first one i have done on a xb Mine of course we cant simply use a intank walbro we have to custom do it. dont mind the wirenuts it was cold and didnt want to go to my work truck for crimps. They are crimp connected now.







here is the stocker



lines in the bay and regulator

 

Its hard to tell from the pic but how exactly are you holding both pumps? I did my pump upgrade two weeks ago so in my head I know what it looks like and how tight the fit was....and im trying to picture where you have the other one. You make a bracket and then zip tie it?

 

nice setup cory!

 

lol no you cant put aa bracket in on the xb2 the tank holds in the pumps very tight took me about an hour to finaglle the whole thing into place in the tank we have a veird shaped tank and there is a spring and its weird but zip ties hold them in

 

Id say -10 is overkill But a -8 or -6 like your using would work just fine!

 

cory how much did it cost u to build that return system ?

 

I like that you are using a dual pump setup in the xB. A little overkill for your needs at this point but I like over kill. Can I make a suggestion. If you are going to link the two pumps why not use adapter fittings and a larger tee section? If you are going to feed one line with two of the exact same size lines you are defeating the purpose of having two pumps.

Also running larger gauge wiring to the pumps would help since you are now running two pumps off the same circuit. Walbros and Bosch pumps draw alot of amps when the fuel delivery is needed and if you have small gauge wires going to two pumps you will cut the flow as they will struggle without proper voltage and amperage getting to them. I have watched fuel pressure drop off at high rpms, re wire the pumps with larger wire that can handle the additional amperage needs and they stay solid.

Based off what I can see you would be better off with a single walbro and a single -6 line at this current time.

 

a single walbro won't pump enough I'm at 400 hp on eth I checked the amp draw its high on start but small rla and the fittings on there flow enoug I'm maxing out 900 cc injectors with 60psi on the ethonal so not overkill neede

 

Correct but what would your duty cycles be on a less restrictive feed setup? Your fuel system is only as large as your smallest part. I think you would experience lower duty cycles with a feed setup capable of flowing more fuel. Just my two sense other wise it's a great idea.

I also didn't read your sig, didn't realize you were on e85 but I stand by my statements that you could improve this design.

 

Cory,

I was thinking the same thing as don but i didint wanna break your *****!

your feeding two pumps into one line not large enough to carry what there flowing.

its like hooking up two spickets to one hose! Your volume is only as good as the hose is letting it. You may get more fuel pressure but not more FUEL. Either changing the line size or running indivual lines is what you need!
Hope it helps either way you need bigger injectors.


On my twin pump setup, i was only looking for additional fuel pressure hence i ran a secondary inline.

Good luck! either way your ahead of game! Also i ran 10 gauge to my fuel pumps. Now on circuit breakers.

 

you got pics elevation ?

 

i think i will be needing that return line set up with fuel psi regulator....