Rep Power: 281

If you use a fuel pressure regulator do you have to convert to a return fuel system?

 
Rep Power: 306

I've looked for a returnless adjustable FPR but I couldn't find any. I heard that Aeromotive or some other company was going to make one but haven't heard anything else about it.

oh to answer your question, yeah you do use a return line. the regulator "pinches" the flow of fuel to increase/decrease the pressure.

 
Rep Power: 281

dang, oh well. let mek now if you find one though lol.

 
Rep Power: 0

I think you do, that's the purpose of the regulator to hold back as much fuel after the Fuel Bar so the injectors get enough fuel, yet alowing fuel to head back to the tank so the pump doesn't over heat. That's if you have an aftermarket pump and are running large injectors.

 
Rep Power: 298

also note:

u can still use a universal FPR on our cars if you wanted to... all you basically do is open it up all the way so you let all the fuel go through it... but you gotta remember you do lose a function of the FPR... the function to adjust.. but if you do connect it you can still use it to monitor the pressure of the fuel..

 
Rep Power: 362

if you were going to get one why not do a return? Its tried and proven so why not just do the work and do it right? j/w.

 
Rep Power: 306

agreed. its not alot of work to get it done. being that you have a k series, i'm sure fuel rails with a return fitting on it are readily available, unlike the d17 where at one time SLP was the ONLY one available (proud owner)

 
Rep Power: 311

yes.

 
Rep Power: 281

Dang i posted this like 2 weeks ago, and now people decide to respond? wtf over? Its all good, got me a new fuel pressure reg, and some piping pluming it up tomorrow or thursday.

 
Rep Power: 298

lol..... in my case i have run both setups.. and in both instances it didnt make sense to tune with the FPR cause my walboro was supplying more than sufficient enough of a pressure... even when i did run the return system fuel delivery was still the same in my system even during dyno runs.... everything from injector duty to pressure... like my tuner was saying.. i aint pushing enough hp to where i need to use FPR tuning... so in conclusion all i gotta say is that in my opinion it all depends on your setup... if your going mild just basic bolt-ons and so forth.. just use it to monitor ur pressure.. if you go built k20 or d17 boost then i highly recommend it... this is just my opinion and may differ from others

 
Rep Power: 281

Lol where have you been? lol. I have a SC K20! lol. do you see that little thing in my sig "Project Super 7"? lol. yeah well my walbro aint pushing nearly enough cause i maxed out my 650cc injectorrs and they are pushing a whapping 100% duty cycle on a cool 20psi of fuel. Tell me thats right? Should be 45 static. Pretty sure the intank is gone. So rather than deal with that and still not get enough for my 650's im doing this.

 
Rep Power: 298

opps.. lol.. i dont rreally look at sigs anymore.. i just tend to read the posts and reply.. haha.. my bad... anyways in ur case then of course hell yea.. anytime u add a power adder i think u should automatically convert to a return system...

 
Rep Power: 281

Yeah its killing me.. 20psi at the injectors? For the love of god. it sucks. But ill get it all worked out. today i was playing with the regulator to see how it works. Any one have some pics of theirs installed? Just currious?

 
Rep Power: 298

what i am curious is how everyone tapped there gas tank to do the return line... someone came into the shop a few weeks ago and had some rubber lines he bought from home depot and used caulking to seal it?? wtf... lol.. i went and bought some steel braided lines and put a tap in there... shesh

 
Rep Power: 306

i just drilled a hole a tad bit smaller then my 90 degree fitting, the pretty much screwed it in place.. used hondabond around the outside to prevent leaks.. works beautifly.. as for pics.. here are a few that i just took.. sorry none of the tank assembly.. tnaaf has good pics of that.

explanation of setup...
Fuel is sent to the rail through the stock line.
Fuel goes out the rail into the first braided line leading to the port on the FPR.
This is where the pressure is adjusted (duh) the rest is dumped in the bottom port to the second hose that is routed to the gas tank, recirculating the fuel and allowing you to adjust pressure however you feel.

I have a boost referencing regulator. for every 1 psi of boost the regulator adds 1 psi of fuel. it's pretty handy, I NEVER run lean. Tuning still needs to be done and will be soon after I get my 3" exhaust finally finished and welded up.

 
Rep Power: 281

Nice.. but 1 question.. is there a way to do it without a new fuel rail?

 
Rep Power: 306

No not really since K series comes stock with returnless setups you would need to either get your stock fuel rail tapped/welded with a return fitting or get an aftermarket one with a return fitting already on it. Either way, you have to have an exit port on the fuel rail for this to work. really thats the hardest part.. you have the pump in the rest is easy peasy.

 
Rep Power: 298

well you can do it with a stock rail just gotta have a machine shop weld on an adapter/nipple so you can attach the exit side to go to the fuel tank.. thats the cheap way to do it... other than that you have to get an aftermarket fuel rail

 
Rep Power: 281

So whats the difference with putting a exit port on the fuel rail, and adding a "T" between the fuel rail and the return? Bassically all your doing is regulating the fuel rail by only allowing that 43.5 psi on the fuel rail and the rest is returning to tank. So im giving it a worle see what happens, if all else fails looks like ill be ordering an new fuel rail.

 
Rep Power: 0

I planning on replacing my entire fuel once i get my new kBlock... i just bough the Aeromotive A-1000 pump. can't wait till my entire car is done! i'm gonna paint it next month in my garage (BMW Metallic Gray)

 
Rep Power: 298

well.. here is a real easy concept to understand... let take a look back at cars that already have a rturn lines... 2000 and older civics...

in othose cars you could add a FPR which would regulate the flow of fuel contained within the the fuel rail

now lets add some bolt-ons to the car and tune.. so now we find out the injectors are not big enough cause car is running lean up top even when we increase FPR...

so now lets upgrade the injectors...

okay so we tune car again... add more power-adders to th4e car and guess what.. we run lean still... next logical thing is to increase the flow from the fuel pump hence walboro etc....

so tune again and still running lean... now the last step (although there are more things u can do lets not go that much into detail) upgrade the fuel rail... they call it a high volume fuel rail for a reason... it holds almost double amount of fuel in the rail ready to be either injected or returned into the gas tank....


so in the hence if you have in your case injectors upgraded fuel pump and a return system it MIGHT be sufficient enough for your application... welding on a return is a cheap alternative to what you want to do... after you do this and you arent maxing out your injectors then you have just saved yourslef a few hundred

 
Rep Power: 281

yeah i get the basic concept of what im doing. Im just wondering, since an RSX fuel rail stock is good for about 500hp, i can weld the return up. ture. However, i was thinking that currently at the rail i have 25 psi. *Found out my hose in my gas tank on the fuel pump was loose.* but ive already started to creat my return system. if on a fuel rail you have an in and an out, you are theoritcally controlling the pressure at the rail as to not add excess pressure on the injectors.. so the excess pressure goes to the regulator and depending on what the regulator is set at *and the vaccume/boost lvl* the regulator with then add back pressure, or allow the excess fuel to return to the tank... So based on that princaple, then i should be able to add a "T" between the Fuel rail, *ie the pressure to the fuel rail* then the remaining parts should go to the intake fuel, and the return fuel lines, and i use the regulator to send fuel back to the fuel tank.

So my question is, will this work?

*ive kind of already started experimenting with it, however i cant get my fuel pump in my tank right now. haveing some plumbing issues lol*

IE something like this:

 
Rep Power: 298

well putting a T before the fuel rail kinda defeats the purpose of running a return... think about it this way... lets say at the rail it holds 25 psi.. then at the T you set it to 40... the pressure will release before it even reaches the fuel rail "theoretically speaking" of course... now welding on a bunk on the other end of the fuel rail however is different.... putting the regulator after the fuel rail it will hold the fuel WITHIN the rail until the selected pressure is reached "theoretically speaking" of course... lol

 
Rep Power: 306

^^ I concur.. I was trying to put my thoughts into words, it would have never come out that clear lol so yea listen to this guy.