Third Line for AFPR?

[Elie_Kaze]

Hey guys.

Shopping around for an AFPR kit and was looking to do it myself. How come in some AFPR kits I see some with two lines and some with three? I know one runs from regulator to front rail and one to the jTube return. Where does the third line I see in kits go?

Thanks!

 

[planemos]

Uhm. The fuel tank?

 

[Poodles]

Vacuum line for rising rate (like factory)

 

[Elie_Kaze]

I'm referring to the third line in Post #3 of this link.

http://www.supramania.com/forums/showthread.php?97699-Guide-Installing-Lexus-AFM-550s-and-AFPR

 

[Suprapowaz!(2)]

Some kits have fuel dampner delete line.

 

[BrandonW]

the j tube bypass?

 

[Suprapowaz!(2)]

What is your current set up?
Turbo:
Injectors:
Fuel pump:

Are you running out of fuel?

 

[Elie_Kaze]

My build will consist of a 61mm T4 setup, 550cc's and Walbro 255.

So the lines go FPR to Rail, FPR to Jtube and FPR to FPD? Is that right?

 

[Suprapowaz!(2)]

Lines go from fuel rail to AFPR, AFPR to return line by-passing j-tube, vacuum source to AFPR, and fuel feed line to fuel rail by-passing FPD. That's if you by-pass the FPD. Somebody correct me if I'm wrong.

 

[te72]

I was thinking that a third line could be for cars with V-engines. Never really looked too closely at them, do they usually have their own regulator for each rail?

 

[veedubin]

I was thinking that a third line could be for cars with V-engines. Never really looked too closely at them, do they usually have their own regulator for each rail?

The aeromotive AFPR has 4 ports total...
1 vacuum
1 from regulator to factory return line
2 inlets from fuel rail(s)

These are universal regulators not supra specific. When using on a supra only one of the inlet ports is used. If you have a dual rail setup with dual feeds(V engines, or staged injectors on seperate rails) then each rail would have its own line to the regulator.

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[Elie_Kaze]

Alright. That makes sense guys. So, the third line it seems I was referring to was indeed the tank line to the FPD.

As a side note, whats the best way to clean out the fuel rail?

 

[te72]

As a side note, whats the best way to clean out the fuel rail?

Err... what would you think to use that cleans better than the gasoline constantly running through it? If you use anything more caustic than gasoline, I would suggest replacing anything rubber on the fuel rail...

 

[veedubin]

Err... what would you think to use that cleans better than the gasoline constantly running through it? If you use anything more caustic than gasoline, I would suggest replacing anything rubber on the fuel rail...

If you have the rail off the car, you can clean it out with some brake parts cleaner. Works great at removing fuel varnish and other dirt. Note, brake parts cleaner is (depending on brand) a bit rough on rubber. Most is OK tho. Also as a maintenance item for your fuel system, look into a product called Sea Foam - follow directions on the can.

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[Poodles]

Sea Foam is crap...

 

[Elie_Kaze]

Yes, the rail is off the car. I will try brake cleaner to clean the rail. Appreciate the input guys.

 

[Mr Bojangles]

I was thinking that a third line could be for cars with V-engines. Never really looked too closely at them, do they usually have their own regulator for each rail?

Correct! Mine has:
One inlet from the rail
One inlet I plugged that would be from the second rail on a 2 rail motor
One outlet to the return line
One opening for the vacuum line
One opening for the adjustment bolt
One opening for Pressure gauge

 

[veedubin]

Sea Foam is crap...

"I reject your reality, and substitute my own"

Some are for it, and some against. I've had nothing but great results on my cars as well as customer cars.

One good case of its effectiveness:
Honda pilot (GM/HONDA/ISUZU dog piles) 3.2 V6 had the notorious lifter noise. To replace all lifters with labor was close to $1800. Told the Guy I would try sea foam treatment first. Used the whole can in the oil, idled 15 minutes, did oil change and Viola! Saved him $1700 and me the hassle of doing lifters.... many more stories like that as well. BTW when a jaguar V12 wont idle right.... sea foam!

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[Poodles]

"I reject your reality, and substitute my own"

Some are for it, and some against. I've had nothing but great results on my cars as well as customer cars.

One good case of its effectiveness:
Honda pilot (GM/HONDA/ISUZU dog piles) 3.2 V6 had the notorious lifter noise. To replace all lifters with labor was close to $1800. Told the Guy I would try sea foam treatment first. Used the whole can in the oil, idled 15 minutes, did oil change and Viola! Saved him $1700 and me the hassle of doing lifters.... many more stories like that as well. BTW when a jaguar V12 wont idle right.... sea foam!

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You effectively thin the oil, which will cause damage (i.e. rod knock). Using it through the intake is no different than using water through a needle valve to clean the cylinders.

It's snake oil.

 

[hvyman]

3rd lines next to the 2 attached to the fpr is dampner bypass. Doesn't go to fpr. Goes from feed line to the rear of the fuel rail.