Lets talk fuel system

[kenny7231]

Gonna be looking into upgrading my fuel system.. Im pretty sure ill be going with an airdog2.. Do i need to get the raptor too? also how about regulated return line? This fuel system is confusing me lol

[Texas~KR]

I'm a newb and would also like to know more about it. How is it fed? Internal or external pump? What's the stock fuel pressure at idle? If a regulator is installed for return, would it need a vacuum source with 1:1 rising rate?
I would NOT like to go with an airdog. lol Only because I have a new aeromotive regulator, distribution block, and braided fuel line lying around my garage.

Sorry if I'm hijacking here.

[SuperdutyKing]

Subcribed...

I'm curious to know as well.

[HeavyAssault]

The AD2 has a Raptor style pump built into the unit. No need to add a Raptor at the same time.

You can add a RR system if you want. I'd wait untill after you jump to the larger injectors. Get a fuel pressure gauge so you can see what's going on now and then after you add the injectors.

TEXAS KR are you asking about the OEM stuff or the AD gear?
The ITP kit has the ability to run the 1:1 boost reference port if you wish. I don't read about too many people hooking that line up since they set the regulator to 60-65PSI and forget about it.

[Abrannan19]

Originally Posted by HeavyAssault

The AD2 has a Raptor style pump built into the unit. No need to add a Raptor at the same time.

You can add a RR system if you want. I'd wait untill after you jump to the larger injectors. Get a fuel pressure gauge so you can see what's going on now and then after you add the injectors.

[Texas~KR]

I'm asking about the OEM pump and where it's located on the 6.0L. Intank or external? Where is it regulated?

Typically, a boost source is needed on regulators if the injectors are plumbed in the intake tract where it will see vacuum, atmospheric, and postive pressure in a turbo system. The extra fuel pressure is needed to keep the same flow against the added boost pressure the injectors are seeing. Being that we're talking about diesel motors, it may be different here. I'm speaking from gas experience, so I'm trying to carry my knowledge over.

[HeavyAssault]

The 6.0 pump is mounted on the frame rail just under the driver's side. It's a puller style pump that pulls from the tank and then pushes to the secondary filter under the hood. In the housing for the secondary filter there is a pressure regulator that opens at 60PSI +/- 5 PSI that will return fuel to the tank. This is where the AD stuff helps out a ton. It will pull the fuel up to the OEM pump and provide a steady supply of fuel at low pressure so that the OEM pump isn't working as hard.



Diesels are different I understand that most people are concerned about the steady pressure versus adjusting the pressure to meet boost demands. I would believe that is why the OEM stuff will bypass before getting to the injectors. If the fuel isn't being used the regulator will open. If the fuel is being used the regulator stays closed.

[hpprose]

Originally Posted by Texas~KR

I'm asking about the OEM pump and where it's located on the 6.0L. Intank or external? Where is it regulated?

Typically, a boost source is needed on regulators if the injectors are plumbed in the intake tract where it will see vacuum, atmospheric, and postive pressure in a turbo system. The extra fuel pressure is needed to keep the same flow against the added boost pressure the injectors are seeing. Being that we're talking about diesel motors, it may be different here. I'm speaking from gas experience, so I'm trying to carry my knowledge over.

On a gasoline vehicle where the fuel needs to mix with the air, yes. On a diesel where the fuel in being injected into the combustion chamber (not the runner) at 28,000psi, no.

The boost reference is used for other things.

[hpprose]

Originally Posted by kenny7231

Gonna be looking into upgrading my fuel system.. Im pretty sure ill be going with an airdog2.. Do i need to get the raptor too? also how about regulated return line? This fuel system is confusing me lol

If you are looking at an AirDog II or stand along FASS or any other regulated fuel pump, you do not need a regulated return line. There is no point regulating a regulated fuel pressure.

Regulated return systems are designed for non-regulated fuel pumps, like the factory fuel pump, Aeromotive, Fuel labs and a whole host of other pumps.

[Texas~KR]

So that would mean that the stock system IS regulated. So why add a regulator kit? Is it too restrictive for a bigger flowing pump?

I can understand getting more pressure with a helper pump, or replacing the feed lines for larger diameter... But from the stock regultor back to the tank, I don't understand the need for aftermarket?