I over analyze things and I was inspecting my primary fuel rails by blowing air through them and came across one difference in the two I have.

I blew through each side of the fuel rail and the side where the pulsation dampener is let no air through on one and on the other a little air bled through.

Is it supposed to be 100% sealed or how should it be?

I'm trying to decide which fuel rail to use and which one to sell and don't want to keep the wrong one.

Also there is some white chaulky looking stuff inside the fuel rail that let no air through, the other was clean inside.

 

Are you sure its a PD and not an FPR there Dr. Brule?

 

Seriously? The primary fuel fail doesn't have an fpr, its always on the secondary rail.

Please don't ask me if I know the difference, here's a pic of a primary fuel rail just to validate my statement.

 

The spot I'm blowing through that's bleeding air on one and sealed on the other is the straight down hose connection next to the pulsation dampener.

 

Not always, JDM is opposite from USDM.

 

Well one of my throttle bodies was different from the other and it was visually noticeable, as far as the primary rails they both visually look exactly the same.

 

So assuming they are both usdm, why is one 100% sealed and the other not?

How should it be ? Or does it not matter?

 

So am I worrying for no reason? I hope its just me being paranoid because I really don't know.

 

post pics, maybe your assumption is wrong

 

I'm assuming you're blowing through the PD (inlet) side. The PD is a diaphram to smooth out pulses. When there is no pulse/pressure, it is closed so you can't blow through it.
Imagine the fuel pump pushing fuel through the lines. The job of PD is to smooth out fuel going to injectors.
If you're going to ask about aftermarket FPR, it's built into it.

 

So its suppose to be 100% sealed? One lets a small amount of pressure through when I blow through it.

Sorry just confused. I'm replacing the pulsation dampener with a banjo bolt anyways.

 

Well, think of it this way. How much psi you think you're blowing??

 

No clue, but no matter how hard I blow it barely comes out but I can hear it, but the other is 100% sealed, I'm not sure which to use.

The 100% sealed one has some white residue inside but not much at all, the one that leaks a little is clean inside.

I'm likely just going to keep both until I figure out which is better to use.

 

Hint: Why are you doing the banjo bolt mod?

 

The stock pd is known to fail and cause engine fires, it failed on my NA.