Plain Jane OEM nothing to see here rebuild

[JustJeff]

Something I just thought of. I had my secondary fuel rail powder coated...and there is a pulsation dampener in that rail. Should I be replacing that? Are there any rubber or plastic parts in that dampener?

[RETed]

Originally Posted by JustJeff

Something I just thought of. I had my secondary fuel rail powder coated...and there is a pulsation dampener in that rail. Should I be replacing that? Are there any rubber or plastic parts in that dampener?

If you're still running the stock Kouki / S5 fuel rails, then the pulsation damper is integrated into the rail.
I don't think you can buy just the PD from the Mazda dealer.

There is a rubber diaphragm inside the PD itself.


-Ted

[Pete_89T2]

^That's correct, the S5 fuel rail & PD comes as a single piece, can't take them apart or purchase separately.

I'd be worried about the powder coating process buggering the PD up and making it prone to leak - I believe the powder coat process cooks the parts in an oven at like 400*F? You can reinstall the PD/rails, and before putting the UIM and everything else back on, pressurize the fuel system (jumper the yellow connector by the passenger side strut tower per the FSM) and check for leaks before ordering a new parts.

[JustJeff]

Originally Posted by Pete_89T2

^That's correct, the S5 fuel rail & PD comes as a single piece, can't take them apart or purchase separately.

I'd be worried about the powder coating process buggering the PD up and making it prone to leak - I believe the powder coat process cooks the parts in an oven at like 400*F? You can reinstall the PD/rails, and before putting the UIM and everything else back on, pressurize the fuel system (jumper the yellow connector by the passenger side strut tower per the FSM) and check for leaks before ordering a new parts.

I've had the car running, but haven't taken it above 3k RPMs. The only leak I've ever seen was simply the front secondary injector not being seated correctly in the o-ring/grommet on the intake. But, I'm guessing that the real test on the dampener is when the secondaries are firing under normal driving conditions.

I was reading last night about banjo bolts and differences between S4 and S5 rails. Also spent a little bit of time reading about difference between rotary dampeners compared to piston engine dampeners. I've got a friend with a S4 TII with a blown engine. I may buy his secondary rail to have as a backup. I was pricing Aeromotive and AEM FPRs last night. You can see where this is leading....but I still need to read more before I can talk intelligently about it.