I've been looking at running a parallel fuel setup. The current regulator that I have is a single inlet, single outlet Sard Standard Regulator. My question being once I split the fuel line to enter the rails with a Y block, can I join the 2 lines after the rails again thru another Y block, just reversing the flow, into the single entry port on my regulator? Does anyone see any negative side effects to this? I figured you would know in this section better than anyone. Thanks

Chris

 

Sounds fine your just y in y out .

 

Anyone else have any thoughts about this?

 

If your running a true parallel system you should run two seperate lines each line from tank to each own rail then Y them after the rails or at the regulator.

Anytime you Y your 2 feed lines you will drop the flow of two pumps to at least 1.65% of the combined flow rate.

If you do Y your lines they should always go up one size ( example two -6 lines to one -8 ).

If you are running two pumps run each pump to its own rail then Y them or T them at regulator

 

Sard is dual inlet. There is a plug on the 2nd port. They did a bad job of threading it though. You will have to tap it as far as possible. Then make sure there are no shavings left inside. I looked in to the same thing but no replies. Is it better to Y in to both rails and exit in to dual inputs on the FPR, rather then the fuel lines going in series. Which is more efficient? Would the secondarys get more fuel with less pressure by feeding the rails seprately?

http://fc3spro.com/TECH/MODS/FUEL/pararail.jpg

 

Series would be one feed from tank to primary rail then exiting and feeding into secondary and exiting to regulator. This is how stock should be.

If you are running each pump to its own rail they should have no problem keeping up with two 1600 injectors equaling 3200 because one stock pump normaly feeds two 550 & two 850 totaling 2800

If you have two pumps flowing say 255 each that are Yd anywhere before the rails they will not flow 510 but drop to say about 385 wich would be less efficient.

 

I'm not running 2 pumps. Yes a true parallel setup would require 2 pumps unless you Yd it right after the outlet of the pump, meaning that you would have twice as much line and twice the pressure drop on the way there. That second hole on the sard is a gauge port not an inlet. I'm really wondering will the Y block thats catching the 2 tank return lines be causing more pressure in the rails then I'm actually seeing at the regulator which I have my gauge on?

Chris

 

Not positive on that but more pressure would be safer than less.
If you wanted to test it you can use a AN fitting (with a port for your gauge) at the rails end to check pressure at the rail to see if its the same.You can also use a port to AN fitting to make your port hole into another inlet. If using one pump it will be a lot less money in fittings if you just run it in full series like stock with one continuous line ending into sard then returning to tank. ( I know because i have spent a lot of $ on fittings)

I had this delema also and ended up buying an areomotive regulator, two nippon denso pumps. One pump runs through the stock feed to primary rail the second pump runs the return line as another feed to the secondary rail then both T using the areomotive regulator as a T and then returning to tank.

 

Thats how I have it now...

 

Anyone else have any input or knowledge with Y blocks?

 

I never got an answer either and left mine in series. Bump for an acurate (not a guess) answer.

 

If you have an upgraded fuel pump, you should go parallel that is split before the injector rails. In my opinion, dual pumps that serve each rail is not good from a reliability standpoint. If one fails you are still feeding the other rail, your engine will run leaner, etc...

With a good pump, split lines and come into an FPR that handles two incoming lines, you will have more consistent flow across each injector rail. In a series, the secondary injectors will see the fluctuations of the primary rail more than if they were split off, especially with larger primary injectors.

Here's a fuel distribution block that connects to the stock line from the tank:





Each injector rail goes into the FPR and then a line from the FPR back to the stock return line.

The stock hard lines to and from the tank are not the limiting factor until you get into some high horsepower applications. Those lines are equivalent to a -6 AN.

The only problem with the above is that you need more space for the hoses.

 

Here is what I made for my car.

You guys and your spendy AN fittings...

 

Survey says: (ding, ding) Sounds logical to me.

Is that a Earls or Moroso splitter and is that a fuel pressure gauge fiiting on the top of it? So Atilla, what ya gunna do when you engine gets dirty "lol".

 

That's a beautiful job!

Those are some tight bends though; when I tried to bend aluminum tubing that much it closed up the inner diameter significantly. How did you get 'around' that?

 

thanks

Can't use those cheep 3 in 1 autoparts store benders. Need a good quality bender.

 

^ Props to your creative diy fabrication skills.

 

You're right that is a very nice job. I'm pretty sure everyone is missing the actual question. I know how a parallel setup works and how it should be run.

Question- Can I Y the lines back into 1 after it leaves the rails before it hits the regulator using a Y block?

Instead of running each line into the FPR which usually have dual ports, Mine has one inlet and one outlet.

Chris

 

I don't see any problem in running them back to 1 before the reg. You're still getting the bennefit of a parallel setup.

 

I don't see why the gauge port can't be used as a 2nd inlet (anybody object)? Areomotive has two inlets + a gauge port. So most likey the setup would be a "Y" before and to each rail then dual hoses to two inputs on the FPR (assuming you have a gauge port also, D'oh).

NOS makes Y's with triple -AN 6 male ends if you don't want to screw it down like the Earls/Moroso block

 

The gauge port on most FPR's is 1/8" pipe. That's pretty small. You might be able to open it up to a bigger port if you take the reg apart. To be honest though, You'd have to be flowing a hell of a lot of fuel to cause enough pressure drop to worry about in a -6 line.

 

I'm glad I have access to a vertical mill for times like this. Why buy what you can make!

 

I would be using Seahose for the actual lines, and all barb fittings.

Chris

 

Oh, I forgot becuase my Sard is 1/8th NPT on all ports. So is it any worse to to Y in and Y out to a sinlge input versus Y in and dual out to dual FPR inputs?

 

good! death to AN hose!