Disco / rrc fuel pump specs (engine swap)

[RamblerRob]

Hey guys,
I'm hoping somebody can tell me what the specs are on the Rover 3.9 fuel pumps. I know they are regulated to 40psi or so at the engine but are these pumps capable of putting out enough pressure/flow for later model gm engines (60 or so psi)

Also my engine runs a returnless fuel system. What are the considerations with using a pump from a return style system.

Engine in question is a 2006 chev 4.3 v6 (LU3)

 

[Roverman2010]

Hey guys,
I'm hoping somebody can tell me what the specs are on the Rover 3.9 fuel pumps. I know they are regulated to 40psi or so at the engine but are these pumps capable of putting out enough pressure/flow for later model gm engines (60 or so psi)

Also my engine runs a returnless fuel system. What are the considerations with using a pump from a return style system.

Engine in question is a 2006 chev 4.3 v6 (LU3)

Its not the pump that regulates the pressure that the job of the fuel pressure regulator, its that round thing on the fuel rail.

should be ok? not using no return line, how does this fancy engine regulate fuel pressure? there is as Ls engine tread about this very thing.

 

[RamblerRob]

Yes I understand that it's regulated by the regulator. I can only find specs on what the pressure at the engine needs to be (post regulator) not what the capabilities of the pump itself are.
Not 100% clear on what happens to excess fuel in a returnless system. There is a regulator at the fuel injection spider.
Wouldn't mind getting better clarity on that whole issue as well

 

[RamblerRob]

I couldn't quickly spot the thread mentioned... Probably part of a larger conversation...

 

[ezzzzzzz]

The FPR is built into the fuel pump assembly on later engines.

 

[RamblerRob]

On minecthere is definitely a fpr at the throttle body by the injection spider... Should only be in one place right?

 

[ezzzzzzz]

If there is a FPR at the throttle body there will be a return line. Take a picture and post it. I suspect it may actually be a damper or some sort of check valve. There will be a single fuel line pipe exiting the upper plenum between the throttle body and the spider assembly connector. It should exit off to the driver's side. An earlier 4.3 V6 will have two fuel line pipes coming out of the upper plenum in that same location.

 

[RamblerRob]

Bah you are right....brain fart... Seems I got mixed up between what I've looked at on the internet and what I have in my garage!

So after more reading my understanding of the returnless system on a 4.3 is that, as stated, the pump and regulator are both in the fuel tank module and it runs at a set psi for the engine.

Soooooo.. Does that mean I need to adapt the right module to my tank somehow or can I just run a regulator after the fuel pump and set the psi at the appropriate level for the engine? Does the PCM want to continuously muck around with the fuel pump?