So, after a little experimentation with fuel pressure to get some more stability out of the engine, my fuel lines burst open. So curiously, where's the best place to pick some up and how hard is the operation to perform?

Rubber fuel lines I'm assuming? As long as they don't have crimped fittings to steel lines you can get them at any pArts store and cut them to length with a knife. If they are crimped lines you'll have to order them specific for your car. I prefer o'reilly's for parts because of their decent prices and quality.

How hard is the install?

Usually not bad. The hardest part is usually getting the fuel line off, but I live in the north where any fitting is a pain to remove. Do you have any line wrenches?

No line wrenches.

On the FC, all the lines are clamped (no crimped lines) from the factory. It's not a terribly difficult process, but sometimes the rubber lines somehow fuse to the metal (or at least it feels like it). There aren't many soft lines; 2 run from the feed and return line on the driver side firewall to the fuel rails, a short length is between the rails, and I *think* there's a short length of rubber hose at the tank, but not positive.



I found it helpful to remove the clamp, grab the rubber hose where it slips over the metal hose gently with pliers, and twist to break the "seal". Then they usually slip right off.



Save the factory hose clamps, and reuse those.



The harder part would be if you want to change the fuel lines under your intake manifold (to your fuel rails). You'd have to remove the manifold go get to them.

Well I haven't located the leak exactly, but it's looking dangerously close to my intake, but my brother spotted the gas primarily spattered onto the block, sizzling away. I'm hoping I don't have to yank off the manifold, but it would still be easier than my 3000GT, so I'm down for whatever.

The intake manifold for rotaries don't have coolant running through so it's not that bad. You should be able to do all you need to by just removing the upper intake manifold and you'll be able to see the injectors as well.

So I was looking at it again; just had so much going on lately, a project car would only exasperate me. Anyway, all I'm gonna have to do is unbolt the intake? I mean I see a lotta business going on in that area, so I'm just wanting to be sure before I put a wrench to anything.

You will most likely need:

new intake manifold gasket (the old one will rip apart)

new fuel lines (obviously)

probably new vacuum hose, the old stuff gets brittle and hard, that's all the black hoses you see there, it's cheap stuff though



And the thing you really want to watch out for, is the oil metering lines. They get brittle and break if you look at them cross-eyed, and new ones aren't cheap. Some folks have had good luck using weed wacker fuel line to replace the stock ones, but that requires some ingenuity on your part. Mainly, DO NOT TOUCH the oil metering lines when working in that area.



Messing with all that stuff can seem daunting the first time, since you don't know what you're looking at, but just take your time and it's fairly simple.



Oh, and while you're there, you might want to look into replacing your fuel pulsation damper. It's at the end of the primary fuel rail (the one under the manifold), and has been known to leak and burn cars to the ground.

Are you sure it's the line & not leaking at the injectors? The injector o-rings may need to be replaced, or just replace them when you do the lines since you will already be there.

I can ask my bro; I was in the car when the action happened. If that's the case it would be a lifesaver hardcore. Baldy, whereabout would these oil metering lines be/what color are they so I can avoid all contact with them?

This is what they look like. I Have gotten into the habit of replacing these as soon as i work on an rx7 for reliability reasons along with removing the rats nest and all that junk down there.



http://memimage.cardomain.com/ride_i...0092_large.jpg

Wow, so clean! My OMP looked like a lump of oily mud with some metal underneath.

Not my engine but mine looked just like that LOL except for stainless lines ahh the good old days.

Now would be a good time to consider removing the rats nest.

rat's nest? Also, where can I get new o-rings and what size secondary injectors are safe? I thought I could ick up o-ring from rx7.com, but they're for the FD, and I am not sold on the compatibility just yet.

The rat's nest is the nickname for the mess of vacuum lines lol I'm not sure about the injectors but I think there's a site for fc specific parts?

For the injector O rings check your local Mazda dealer or maybe some of the site that sell injectors.

so part-wise the injectors under the manifold are the same as the top ones in design, right?

Their flow rates might be different but I believe they're the same dimensions

Yeah, im running 460s on top and 550s for secondary.. that won't get me too rough will it?

Is this n/a or turbo? If this is n/a, and you're using the factory ECU, you won't see any improvement by using larger injectors, it already runs pretty rich on factory settings.



Also, when you say "on top", do you mean the injectors that are on top? If so, those ARE the secondaries, the primaries are the ones under the intake manifold (assuming this is n/a, I don't know nuthin' 'bout turbo).

Yeah, this is NA, but I couldn't find a spot to buy more stock injectors, so sad pandas here.

Hmm interesting; having a hard time finding a gasket for the intake manifold too..

All you had to do was ask! I've got several stock injectors laying around, never could find anyone to buy them. Mazdatrix has gaskets (along with pretty much anything else you would ever need for your car).

Awesome man! But in other news, this is the gasket I need right? http://www.partsgeek.com/gbproducts/...ek+Google+Base

If you separated the upper intake manifold from the lower intake manifold, you need this gasket.

http://mazdatrix.com/pictures/c-intake/13-112A-N326.jpg



If you removed the lower intake manifold from the engine block, you need this gasket.

http://mazdatrix.com/pictures/c-intake/13-111A-N326.jpg



For these, I like to use non-permanent gasket sealant, because you're more than likely going to remove them again at some point while you own the car. I don't know what the pros think, but this allowed me to re-use them, they didn't fuse to the metal and rip to pieces next time I removed them.

Ive used silicone on mine with no issues removing later or vaccum leaks. Any local parts place can get you the gasket set and will sell the injector o-rings at not too much of a cost.

Ok, finally got some good weather comin this week, so nows a great time to get this job done. However, now that I'm about ready to pull the upper intake manifold off, it's like it's been welded together, which is highly frustrating. No matter how hard I yank and pull it seems like I'd be more likely to pull the whole engine than the manifold...

Make sure you've got all the bolts/nuts removed.



For the upper intake manifold, there should be the 5 (you can see their locations in the gasket pic above), and there should be one more out of the side of the manifold, facing the firewall. It hides from you, and I think it's holding on a hard vacuum line.



On the throttle body, there is a bracket holding it to the engine, I believe 2 bolts hold the throttle body to the bracket, the bracket is held to the engine with 1 bolt (this is where your infamous ECU ground is, clean that ground up while you're in there).

Alright, so I got the manifold off, and the new injectors in, just gonna get some gasket sealer and call it good! Will hear from me soon once I take it down the street for a trial run

What was holding it on?

Pretty sure it was gasket sealant; makes me wonder how long it's been since that thing moved. I tapped at it for a while and gave one last tug before I gave up when it practically fell off. Went ahead and hooked everything back up and it sounds a lot better; now I just need to get my battery juiced back up and tires inflated so I can put it on the street and give it a test run.

So how's it running now?