Tapping stock fuel rail for return system

[m1tch]

Hi all,

Just wondered if anyone had drilled and tapped the OEM fuel rail to make the system returnless - this way you can then use an adjustable FPR as this needs to be fitted on the return line, thinking that you might be able to drill at tap the rail between injectors 3 and 4. I am aware that you can also simply crush the OEM FPR slightly to increase fueling but I will be wanting to run a 1:1 rising rate regulator when I do go for boost to ensure proper fueling, don't really need to go all out billet rails like those sold on MWR.

[shnazzle]

Check with Lee (leethesparky) on his build thread. He has a rising rate fpr on his.

Sent from my ONEPLUS A5000 using Tapatalk

[Essex2Visuvesi]

I was going to message Lee about the same thing, as I want to go RR FPR om my build

[m1tch]

FPRs should be added onto the return line as this is how is builds pressure - interested to see how it works on a returnless line as I think there is an FPR in the tank for those.

Part 1:

 m http://www.autospeed.com/cms/article.ht ... 1&A=113087 m

Part 2:

 m http://www.autospeed.com/cms/A_113088/article.html m

It would seem that you can run an external if you disable and plug the OEM reg in the tank and then run a return line.

[Essex2Visuvesi]

Just spotted this on spyderchat as well
 m http://www.spyderchat.com/forums/showth ... rket-FPR-s m

I've dropped Lee a PM with a link to this topic asking if he would mind commenting on his setup

[Leethesparky]

Mine has a RR reg, but it's tee'd into the fuel feed. It returns back to the tank and the pump cage has been modified to accept this.

I am completely changing it in a few weeks as I have modified a 1zz fuel rail, cut off the ends, welded on some tapped ends with an6 fittings and painted it a pretty colour (mwr one overpriced). So it will be a proper return rail setup.

Will do a video in it but not got any time spare to work on the car the next couple of weeks.

[m1tch]

Mine has a RR reg, but it's tee'd into the fuel feed. It returns back to the tank and the pump cage has been modified to accept this.

I am completely changing it in a few weeks as I have modified a 1zz fuel rail, cut off the ends, welded on some tapped ends with an6 fittings and painted it a pretty colour (mwr one overpriced). So it will be a proper return rail setup.

Will do a video in it but not got any time spare to work on the car the next couple of weeks.

That would be awesome, your videos are great and are always very informative, I do agree with the MWR one being overpriced, you don't really need a billet rail, a modded stock one would suffice, I will probably look to do the same as you at some point once I go boosted.

[Leethesparky]

Here's a pic of said rail.. it's fitted and video should be on YouTube soon

[m1tch]

Here's a pic of said rail.. it's fitted and video should be on YouTube soon

Awesome, I'm subscribed to your YouTube channel, top work!

[Essex2Visuvesi]

Wanting  s:) s:)

[shnazzle]

Lee, another epic video.. However... Why a fuel return rail? Pros/cons. Would be great in the vid

Loving the vids. Watch every episode  s:) s:)

[Leethesparky]

Lee, another epic video.. However... Why a fuel return rail? Pros/cons. Would be great in the vid

Loving the vids. Watch every episode  s:) s:)

Cheers Patrick. I should really mention the reason why I do things... doh

[m1tch]

A return fuel system will give you better control over the fuel pressure rather than the dead head setup like OEM.

[shnazzle]

I know this but others likely don't. What I don't know is, what is the process of setting the FPR? You mention without the vacuum line connected, but how do you know the correct pressure to set the FPR?

[Essex2Visuvesi]

I wonder if we can talk Carolyn & Dave or Weidemuller into running off a batch of these?

[m1tch]

I know this but others likely don't. What I don't know is, what is the process of setting the FPR? You mention without the vacuum line connected, but how do you know the correct pressure to set the FPR?

The manufacturers usually have the specs saying it flows 330cc @ 40psi for example, you can set the fuel pressure to that with the vacuum line off, with the line on it will then change the pressure up or down to always have 40psi between the rail and intake manifold - flowing less on vacuum but more on boost. You could however chose to run the injectors at a higher pressure and get extra flow out of them (to a point), eg running the system at 50psi might then flow 360cc.

[lamcote]

Any of the fuel injector size calculator websites should be all you need to calculate the pressure required.

[shnazzle]

Ah that makes sense. Cheers

[maybeturbo]

Does anyone know for certain what the pressure is standard? I've got all the bits together to do a return system and a walbro 255 with rising rate fpr. I'd like to know the standard pressure for comparison purposes once it's up and running. Also how are people modding the fuel pump cage to take the return line. I dont plan to mod the rail, just tee it in before the rail as others have done.

[m1tch]

Does anyone know for certain what the pressure is standard? I've got all the bits together to do a return system and a walbro 255 with rising rate fpr. I'd like to know the standard pressure for comparison purposes once it's up and running. Also how are people nodding the fuel pump cage to take the return line. I dont plan to mod the rail, just tee it in before the rail as others have done.

Stock pressure seems to be 44 to 50psi as per technical manuals  s:) s:)