NZConvertible

No, I mean "original" as in on the car from when it was built, and "new" as in bought from Mazda yesterday. If you buy a new PD now I would fully expect it to last 15+ years, but it's quite possible longer the car will be "retired" for some reason before then, i.e. a "new" PD will outlast the car.

I'm quite sure you would've noticed your car was on fire long before you were in any real damage. There is a heck of a lot of steel between you and a burning engine. I'm not trying to say this wasn't a serious situation, it obviously was, but I think it's a bit silly to say "remove your PD because you might burn to death". Unless you sleep in your car, you'll be winning the lottery's big one before that happens.

Hell no, I'm sure I'd be fair shitting myself at the time! I just wouldn't be telling everyone afterwards that I came close to death...

For about the millionth time, this has NOTHING to do with how long injectors last. This is a complete myth that keeps being repeated by people who don't really understand the topic. I don't even know why people would think the injectors could be damaged this way, coz it makes no sense to me. The real reasons for having a PD have been explained many times in all the other threads as Aaron mentioned. Feel free to search for them.

Rotary_Rocket_87

I know it has nothing to do with injector life. That is why I posted it. Read a little more carefully and you will see that I said my Jeep injectors were 230,000 miles old. I did search and all I found was a bunch of purists bitching about failing injectors, so I though I would throw out some real information to kill this myth.

drago86

Did you ever think thats maybe the jeep's fuel pressure regulator was built to help dampen the pulsation?
Or maybe that the jeep has enough length of rubber fuel lines around the rail to dampen? Or think of the fact that rx7s have abromally large injectors that induce much greater pulsations (a 6 clinder making 200 hp is what, 125cc per injector?)
Or that the engineers who decided a pulstation dampner was needed know a hell of alotmore then you do?(Do you really think the bean counters would have let an unessicery part that costs mazda culmulativly thousands of dollars to install onto their cars fly?)
Or that the fuel injection on a 1987 jeep has absolutely nothing to do with this disscussion?

drago86

http://www.injector.com/fueldampers.php

This is why you need one.

Please note that injectors in rotary engines are HUGE compared to most piston motors. Stock 6 liter LS1's only have ~ 250cc injectors. This is why we need a pulsation dampner in our fuel system even more then piston motors. Every generation of rx7 has had one for a reason.