Turbonut

iTrader: (1)

Just thought I'd post this for those of you who are not familiar with the "device". A lot easier than wiring a switch to shut off fuel on every shutdown.
Check Mazdatrix website.
Sorry, picture didn't copy. Nothing other than an "H" which goes between the feed and return lines.

INJECTION FUEL PRESSURE BLEED-OFF (86-92)

We continue getting a number of cars (86-92) in our service department (and many phone calls) with leaking fuel injectors. The main symptom is flooding after the car has been sitting for a few hours. It can manifest itself after running for as little as a minute or two! Basically, if you try to re-start the car anywhere from a few minutes, to a few hours later, it just will NOT start. The "no-start" is usually OK after sitting for the night.
The injection systems hold residual fuel pressure for many hours after the engine is shut off, and if an injector is leaking, it will simply drip fuel in the engine until the pressure has stopped. This part we have assembled should be considered a temporary fix, or a diagnostic tool only, because it is not going to fix the root problem. However, it can get the car back on the road for a lot fewer $$ than new injectors. Plus - it is hard to find out which injector(s) are the problem - you have four!
It is installed in-line where the fuel supply and return lines attach to the engine, below and forward of the oil filter. There is a very small jet inside the "H" that allows the residual pressure to bleed back to the tank, thereby preventing the pressurized dripping past an injector.
----- The Kit includes the fuel lines and clamps needed, plus installation instructions. -----

Part Number 13-MZ-BLEED

Samps

Not sure why there is not a simple device like this from the factory. Is there any reason for the fuel system to stay pressurized after the car is shut off? I thought about getting that a while ago when I had the intake torn apart just for preventive maintenance, but they used the word temporary and it scared me away. You could easily attach this to a stock fuel system without removing anything from the car, although it would be much easier without P/S or AC.

Turtle's TII

Check to make sure the fuel pressure is leaking down before you assume this is the problem. Mine did not leak one bit, and still had the problem.

I have gone through all the BS, I really wanted it fixed right, and spent over a year doing so. The switch is an easy install, cheap, and it works. Save your time and money and buy a switch.

Turbonut

iTrader: (1)

Not to start a war, but fuel pressure rises after car shutdown, because of expansion, esp. on a hot day. If you saw no increase in fuel pressure, it was probably leaking slightly into the chambers, or why else would a switch work to shut off the fuel.
As I've stated before, my '89TII which I purchased new, now 156,000, has never flooded, so I've not had to dicker with these band-aids.

vosko

iTrader: (4)

my TII when i first got it had a flooding problem but the more i drove the car the better it got until it eventually started every single time

Turbonut

iTrader: (1)

That's probably because you drove it wide open most of the time....Really cleaned it out!!!!!! Just kidding.

Turbonut

iTrader: (1)

That's probably because you drove it wide open most of the time....Really cleaned it out!!!!!! Just kidding.

Turtle's TII

It does not expand to the point of raising fuel pressure on an already hight pressure system. I modify fuel injected cars for a living. And the diagnosis for leaky injectors is just what I said, check for leak down.

The reason the switch worked was because it stops the pump from pumping while cranking. The ECU therefore can not add too much fuel. When it starts to fire, turn the switch on and your off. I do not shut the switch off to kill the car, and the fuel pressure. I use it for start up only.

You have a better/different computer system in your car, and it is not as much, if even, an issue.