It vents the gas fumes back into the intake to sent through the exhaust.

At idle, the gas fumes are handled by the charcol cannister. While the engine is under load (ie, driving), the gas fumes are handled by the purge control system.

 

Just to add...if no one mentioned it....

When you replace your injector o-rings, you must also replace you injector GROMMETS. They will help SEAT the o-rings and the injectors tighter. Over time, the grommets get groves in them from the bottom of the injectors...plus the get hard.

I WOULD RECOMMEND THAT YOU REPLACE YOUR PD! Just cheap insurance....(cheaper then replacing everything above the block).

Good luck.

 

Sweet! I actually helped someone.

 

ok, another question about the hoses going to the aluminum check valve, i just replaced them with silicone when i did my hose job, but since it carries gas fumes should i change it to regular rubber hose? silicone is very bad with oil , and supposedly gas too?

 

Yep, you'd be better off in the long run with rubber on these.

 

thanks for the info ES

 

Can I replace that alumminum check valve with just any kind of check valve? I have some extra ones that I pulled off when doing the hose job that I could use, but if its going to impare the engine or not even work.... 17 dollars cant hurt... but at the same time, why not save 17 bucks and use one of those cute little green plastic ones.

 

I don't know for sure, but I believe the valves are made to open at specific pressures (hence why each check valve is made different).

 

im in the middle of doing the sillicone hose job... which aluminum check valve are you refering to? mine are all plastic!?! i have to make sure i dont switch it wiv a silicone hose!

 

sounds good... do you by any chance have the product code for that valve in specific?

 

Look at the bottom of Page 1 on this thread.

I don't have a picture of it, but it's located close to the PCV valve near the oil filler neck.

 

yea, its near the oil filler neck, by the throttle body, its around in that area, just look around for a silver aluminum piece connected to two hoses. thers only one there

 

also,

how can we tell if the valve is bad.... mine seems to still stop the air flow, I remembered I was seeing what it was and was sucking on it and it still seems to block the air flow.

 

You should only need to replace it *if* you can blow through both sides. If you can only blow through one side, and only suck through the other side, it's fine.

 

this is an old thread but the fpd was not the basis of the fuel recall. the fuel recall was to replaced the fuel line in between the secondary injectors (on the Lower Intake Manifold) and Primary Injectors. the new hose attaches directly to the secondary injectors with the banjo bolt and made of a different material that is more durable. coincidentally this hose is now about $100 to buy new from mazda but all recalls should have been completed by now. of course it is a good idea to replace the fpd and injector o-rings when in there.

alex