I have a '91 n/a. Something is leaking fuel from somewhere above the engine block, and since the fuel hoses are relatively new, from when I replaced them last year, I assume my pulsation damper has finally broken. However I want to be sure of this before I spend the $226 (mazdatrix) for a new one. I don't want to buy a new pd and then find that I just had a loose hose or something. Is there anyway to test the PD? Once I have the TB, UIM, LIM, etc. off, I obviously can't start the car and see if it leaks.

Also, It only seems to leak as the car is warming up. If it's cold, it will run for about five minutes or so, and then start leaking. Before I knew what was leaking, I started the car and tried to find where it was coming from. By the time I realized that it was gas, the car warmed up, and I shut it off. I started it again to try to see where the leak was coming from, but it didn't leak at all. I let it idle for 10 minutes and even revved it a few times up to 5-6k. I thought my car had fixed it self again. I went out the next day, and started it again and it leaked again, and I saw some gas on top of the engine, so I shut it off and haven't started it since.

I searched, but didn't find what I was looking for.

 

I'm not to sure if theres a way to check to see if its leaking. If you feel pretty confident its your pd than keep a fire extinguisher in your car(can save you lots of money) . It probably leaks when theres big temperature changes cause the rubber on these parts can expend and contract and eventually crack or tare. If you don't have the money to replace your pd than do the banjo bolt mod. Before anyone flames me, a banjo bolt is better than a leaking pd. Anyone that says different obviously hasnt had an engine fire yet.

We'll now that I think about it I suppose you could take off the pd and find a way to pressurize it. But on the otherhand if it is leaking, pressure will kill it and you'll have to replace it anyway.

 

If you're at the right angle, you can actually see the front of the PD.
If it is not leaking from there, it is probably still good and leaking from one of the lines coming off of it or from another source. The S5 PD isn't as prone to leaking as the S4 PD but if you're going to rip everything down to fix it, and you have a higher milage car, might as well put in a new one in anyway. One less thing you'll have to worry about later down the line. As far as doing the banjo bolt mod, this only applies to the S4 PD.

 

Run the fuel pump by jumping the yellow test connector you will find in the airbox area and then setting the ignition switch to "ON" / "RUN". Now examine the area where you suspect the leak is with a bright light.

 

Put a banjo bolt in and never worry bout it again!