100+ PSI fuel pressure

[Twan]

If the gauge is on the regulator then it has been regulated, so your not getting a reading of the pressure before the regulator.

 

[09stroker]

Ok, then tell me why every regulated return has the regulator after the heads

 

[Twan]

Easy, it's a regulated return. Key word being return, now who has checked there pressure before the heads and before the regulator? I'm betting no one has.
I'm not trying to be a ass, so let some people test this and see what happens.
If someone want to call and we talk, work out a price for parts, I will pay the parts cost if I'm wrong.

 

[Pizza pig]

The stock system is a regulated return, it regulates the fuel needed to send to the injectors and returns the rest before sending it to the injectors. A "regulated return" just does this after the injectors so there is always the proper amount of fuel in the rails. The fuel supply BEFORE the regulator should be what the regulator is set at, not after, like stated before these are bypass regulators.

 

[alwil]

I would bet Twan is right.
They dont make an upstream regulator, thats why in every instance where a regulator is needed it is before the low pressure part not after it.

 

[09stroker]

So your saying every regulated return is running 100+ psi (well really could be any number since it's not at all regulated) to the injectors?

Why on earth would you want to only regulate the fuel you are dumping back to the tank?

 

[alwil]

The stock system is a regulated return, it regulates the fuel needed to send to the injectors and returns the rest before sending it to the injectors. A "regulated return" just does this after the injectors so there is always the proper amount of fuel in the rails. The fuel supply BEFORE the regulator should be what the regulator is set at, not after, like stated before these are bypass regulators.

So he should take his readings off of his y block at the front of the heads?

 

[Twan]

You can't regulate fuel before the regulator. For $100 you can check this. Like I said I will pay the parts if I'm wrong. Just call and will talk.

 

[09stroker]

So he should take his readings off of his y block at the front of the heads?

If the entire system was sized properly and allowed full pump flow to the regulator so it can do it's job it wouldn't matter if it was checked at the regulator or the y block. But, if there is a restriction somewhere between the pump and regulator that restriction would cause the pressure to rise between it and the pump.

 

[Twan]

Each pump has it's own psi set, some you can adjust on the pump, others can't.
Test it. You'll see.

 

[alwil]

So your saying every regulated return is running 100+ psi (well really could be any number since it's not at all regulated) to the injectors?Only in cases where the pump can push that much fuel

Why on earth would you want to only regulate the fuel you are dumping back to the tank?

You dont.....but the pump only knows one speed and its going to pump as fast as it can untill something is put in there to slow it down.
I think his regulator is bypassing fuel before his truck is running and thats why he is getting a lower reading at the regulator before startup.

 

[09stroker]

You can't regulate fuel before the regulator.

Have you seen how elite sets up their 6.4 fuel system? It doesn't even go through the regulator, it just tees of the line coming from the lift pump to the HPFP.

 

[alwil]

Deleted....I missread post.

 

[09stroker]

Each pump has it's own psi set, some you can adjust on the pump, others can't.
Test it. You'll see.

Of course, that's what regulators are for.

 

[09stroker]

If there was a restriction the pressure would drop not rise.....

Your leaving details out. It would be lower AFTER the restriction, and rise BEFORE the restriction.

 

[Twan]

So why haven't people that sell and or build the kits commented yet?

 

[kyle43335]

if the regulator gauge port was on the return side(bottom port),the gauge would read zero.

you cant have pressure without restriction for the pump to push against.

that is what the regulator does. it provides a adjustable means to control pressure.

and when you increase pressure,you decrease flow. they dont rise and fall together.

 

[SICKS LITER]

the stock banjos and stock hardlines on the back of the heads are a major restriction.

i would run -10 (5/8s) from the pump to the engine then split it to -6 going in and out of each head to the regulator.

 

[kyle43335]

the stock banjos and stock hardlines on the back of the heads are a major restriction.

i would run -10 (5/8s) from the pump to the engine then split it to -6 going in and out of each head to the regulator.

with atleast a -6 return line. if not ideally -8

 

[2wd-fire]

If the entire system was sized properly and allowed full pump flow to the regulator so it can do it's job it wouldn't matter if it was checked at the regulator or the y block. But, if there is a restriction somewhere between the pump and regulator that restriction would cause the pressure to rise between it and the pump.

this is 100% correct