Pulsation Damper
 

I read my manual and it told me to put my finger on it while the car is running and feel for a pulsating... After I forced my hand into this space and acquired many new burns I felt this ever so slight tapping... I then felt about 5 other parts of my engine and it was everywhere... Is there a better way to test it or is it such an obvious pulsation that I would know it if I felt it...? I did search by the way and there where only 5000 resluts and none of the first 35 I checked had the answer...
89 NA Stock...

If it's not leaking, leave it alone. Mine is leaking and I need to have it replaced with a Banjo Bolt.

If it is leaking replace it please don’t half ass your work. Your car deserves bettor.

I seriously don’t know where the concept of the part that Mazda engineered to be here for a reason is finally leaking so lets just remove it, came from. But rest assure it’s popular.

Here I like to use this http://floridastage.com/fueldampers....0bb6cad8ca035f

I'd replace it to be on the safe side. When it starts leaking there may be no warning before the car catches on fire.

I dont think it is leaking, but I will replace it... I appreciate the replies... Just to make sure... We are talking about the little metal canister on the end of the primary fuel rail toward the front of the car, right? How does that start leaking; just asking out of couriousity...?

Awsome website... Somehow I feel enlightened now... Thanks...

It flys off and sprays hot molten gasoline everywhere that ignites everything on contact and usually ends up eating through the windshield and causing 2nd degree burns on the driver.






Or... the screw falls out and fuel leaks out and drips onto the exhaust manifold until it catches fire. You pick...

The PD has a Plastic cap on it's end. You said metal and that makes me wonder if your on the pressure regulator instead????

Next time get a long screw driver. Place the tip end on the item you want to listen to. Put the other end against your ear opening. Press it against your ear, not just close to the ear. You'll hear the clicking.

PD pictues attached. One with a old and yellowed plastic cap and the other brand new with a clear plastic cap.

The PD is "supposed" to have a cap on the end, but some of them probably fell off a while ago or were taken off by putzes. Or is the plastic cap necessary?

Oh, and the FPR has a vacuum nipple on it and the PD doesn't (do you have a special table for pictures or something? I see pics like that from you all the time).

I Think the cap is just to keep people from playing with the screw on the end. That screw is a part of the RUBBER diaphram, and if you bottom that screw out, and keep turning the screw, your also twisting the diaphram which will destroy the diaphram and fuel under pressure will leak out and engulf your engine in flame and fire and brimstone.

My jpgs come off a scanner and the junk parts bin I have. I really hate throwing things away.

I believe S5s don't have the plastic cover. When I did the S5 UIM swap, I went from the S4 fuel rail to the S5 fuel rail, and the S5 PD is all metal. Check Mazdatrix's photos:

http://www.mazdatrix.com/c-pulsation.htm

To replace the PD on the S5 you have to replace the primary fuel rail, but it's not that much more expensive than just the S4 PD by itself. The S5 PD has a metal cover on it, not a plastic cover. The PD is a diaphragm supported by a spring, the diaphragm gets hard and tears with age, then the fuel leaks into the cap and drips onto the engine, potentially causing a fire.

There is another method of pulsation dampening that has not been mentioned much. Basically add a vertical section of pipe with a cap to the secondary rail. This traps air in the pipe and the air can be compressed unlike liquid. This allows it to absorb the pulses caused by the solenoid knock.

That is a sweet fuel damper, does this just screw into the S4 FPD???

I've got an S5 (single piece FPD) and wouldn't mind swapping it out for the S4 with this incorporated into it...

If you've had to ask this question, replace it immediately, no questions asked. Search the forums, you'll find pics of other people's BBQ'd 7's who didn't make up for Mazda's fuck up...

Seriously. Replace it.

actually the stop screw vibrates in and out, so the idea of the covers was to prevent anything from getting into the outside diaphram of the PD or the screw touching /bumping into anything (like a wire or hose or dead mouse).

No, it is not all metal. Go look again. There is a rubber nipple where the S4 screw is.

So for over damping control on the S5 PD (and S6) , you have to rely on the rubber streching and/or compacting enough to provide the PD from over extending and ripping.

Don't know how much I trust exposed rubber in a engine compartment after 15 years (or even 10 years for that matter), that the rubber won't rip and allow the PD diaphram to over extend and rip... squirting fuel out like a bellows on a blacksmith shop.

What he said. I have seen it. I was doing a rebuild and used the old PD. Had the UIM off at the time, jumpered the fuel and I could see the screw start to poke out. Then it started leaking, so I got a new PD.

thant pic on the first page is of a primary TII rail and the N/As have it on the secondary rail, but thats with s4 cars and i havnet ben able to look at an s5 car's rails so i dont know what the pd looks like on the s5 cars, how ever i think the pd is part of the rail its self and you will have to get a new rail, but i'm not for sure.

PS were can u get new PDs at i've looked at auto zone, auto value, and napa, and they say they cant get it am i gonna have to go to mazda?

um wrong-o, N/a's have it on the primary rail facing forward . . .

i put in a banjo bolt, no problems at all, but it is a temporary fix indeed

I am just going to go with the nice one that I think ICE BLUE left a link for and I an either going to make my own fuel rails or buy a set of them... I like the way the aluminum rails look...

This place is cheaper than Mazdatrix or most Mazda dealers, but you may need to email or call them for the correct part number:

http://www.trademotion.com/partlocat...?siteid=214264

I guess I meant they don't have the big plastic cap that the S4 does, because there was some concern that this S5 PD doesn't have a plastic cap. You're right though, they aren't all metal; I stand corrected!

yeah, they cheaped out on the S5 (and S6) PDs with the all in one design and lame rubber stopper (which any FD owner can tell you was just a stupied design).

I have done my research and came to the conclusion that I will need to buy and after market fuel flow regulator and pulse damper to make the after market fuel rails work on my car... I am almost certain that this would actually be cheaper than buying the crappy oem stuff... I did find instructions on what I would need and what I would have to do to do this... I have since lost that link...
If anyone knows where it is please leave me a link... If you do not know where it is, but know how to install the aftermarket fuel flow regulator, pulse damper, and fuel rails and you also know exactly what parts to buy; I would greatly appreciate any assistance...
I have also come to the conclusion earlier today that I do have a fuel leak somewhere under the hood... I was not aware of this earlier...

Thanks... '89 Stock N/A

Mazda Dealer part# (S4TII). $147 JE27-20-180