Smells like gas under my hood, upon inspection it looks likea fuel leak around my primaries.

They are stock (s5 tii 550cc) with 120,000kms on them. Just wondering if it may just be o rings or if its a common thing to happen.

Don't know if I should just get another set of 550s or upgrade them to 720/850 cc? (idle problems?

Insight would be apreciated.

Going to tear the upper intake off and investigate further. I"m assuming the walbro 255 didn't help either :P

car is running microtech lt10s, 550 primaries and 800 secondaries. (s5)

 

STOP WHAT YOU ARE DOING AND DO NOT DRIVE THE CAR!!!!

That being said, it's your pulsation dampener that is leaking. On the S5's its integrated on the primary fuel rail, which is where you are seeing the leak (the PD looks like the "UFO" at the end of your fuel rail). You need to get a new fuel rail in order to replace it. I had the same problem happen when I bought the car, always had a wiff of fuel in the air. Next thing I know I am driving to walmart and it gets bad. Already knowing what it was I went straight home and luckily the car did not catch fire.

If you fix the problem right away your car will not catch fire. The walbro probably made this worse by beating on the worn PD with the higher pressure...

Go to mazdatrix.com for a new one, its going to be pricey.

 

It's almost always the PD. Source a new rail, and some new o-rings/fuel line if the current stuff isn't relatively new.

 

i knew it was a problem on S4s.... but is it a common problem on s5s?

I'll take off the upper intake and prime the fuel rail and see whats going on. Doesn't look too bad yet, but i definitely won't be driving it anymore :P

 

It's a common misconception that the s5 PD is bullet-proof. They are both likely to fail and the s5 will cost you more $$$ to fix...

 

might as well just get an aftermarket FPR and new fuel rails~~~

arrg :P

 

I thought about doing that when my PD went out. It was cheaper to just replace it, unless you are planning on doing that in the future for a project or what not...

 

I'll double check to see if its the FPR. It must have been leaking for the past month but i thought the car was just running really rich. I checked to see if there was a fuel leak and sure enough. But it looks minor and around the primary injectors and not the PD...

Oh well. Luckely i don't drive the car that often.. fire is bad :P

 

How come you need new rails if you wana get a new PD?? I bought a set of s5 tii rails with no FPR and no PD under the impression I would just buy new ones and slap em on, there is no way to put on just a new PD??

 

you don't need new rails for the PD. and if its not the pd, check all the grommets and orings to see if its leaking, and don't forget, DON"T FORGET to put back the spacer plate on the primary rail.

 

They must have not been s5 fuel rails then if the primary doesn't have the PD on it....

It is located on the primary fuel rail and integrated into it, I don't know why you are telling him it isn't.

 

All S5 rails have the FPR and PD integrated. It does not thread in like S4s. If the PD fails, you get to buy a whole new rail. As mentioned, what you bought were not S5 rails.

It's not an S4. Let's try to keep the misinformation to a minimum.

 

Oh well I might have s5 rails, I wasn't aware that the FPR and PD are integrated on s5, does it look like s4 rails when the PD and FPR are connected? Becase mine just look like rails, I'll post pictures later today, I figured you could swap the PD and FPR because that's what you have to do if you run JDM rails on a USDM 7, because the fuel flows opposite on JDM rails than USDM

 

They look fairly different since there are no threaded fittings. And with j-spec rails you don't need to swap the PD and FPR positions (although you probably could with S4s if you really wanted to). Switching the fuel feed and return lines is much simpler. I have S4 J-spec rails on my engine, so my PD is actually on the back of the secondary rail. It actually worked in my favor after the first PD I tried leaked after my first try priming the system. 10 minutes later I had a new PD threaded in without taking anything apart.

 

ok well if I can remember I don't think I had any threads on mine, double check later, is there any way to test the the rails to see if thePD and FPR are in working condition besides just hooking it up and starting the engine

 

Add fluid and pressurize to around 50psi somehow.... Or install on the car and jump the yellow connector on the passenger side to run the fuel pump with the key ON and run for 30minutes to ensure there are no leaks.

 

Ok I'll try and figure some way to presurize the system, I was only asking to see if there was a known method, and I would hook it to the engine but I'm building the engine piece by piece lol

 

Hook it up to the fuel incoming and return lines..... Then run the fuel pump using the yellow connector. Should pressurize it and work out the same... No need for actual engine in the car.

 

Hmm well I'll see if that will work, I'll need to hook up the batterey, I'm assuming I'll need the ecu to run the fuel pump right? And I have no fuel injectors any suggested on how to plug the holes in the rails?