Fuel smell and pulsation dampener issues
 

Hi guys. I know there's a few threads here about this issue however i believe my fc might have the wrong fuel rail since the dampener does not seem to be removable like others ive seen and searched for. I understand the turbo set up is slightly different but mine is Non turbo. I replaced the grommets on my injectors yet when i search for leaks around the rails and spray the injector area it still revs up as if a leak was still there. I bought new injectors which i have not installed yet but will do so soon. Im just worried about the dampener issue since i read and was told they tend to light on fire and i want to avoid this as much as possible. Please let me know if the rail seems like the appropiate one (someone else rebuilt this engine before i bought it) and where is a good place or site to acquire a good one.https://cimg3.ibsrv.net/gimg/www.rx7...7e1c9c669c.jpg

it is the appropriate rail, you have an S5 which has stamped steel fuel rails. unfortunately to replace your PD you must replace the whole fuel rail. but the PD is on the primary rail, not the secondary one you pictured.

a cast aluminum S4 primary rail can be used, but will only fit with a pulsation dampener delete.

I might just replace the whole primary rail atkins rotary sells the whole unit with the PD already installed. I will look into this later but do you think the PD could be replaced alone? And what do you think about the leak i described? By the secondary rail injectors? I see no fuel liquid dripping off them.

no, the stamped steel rail S5 you cannot just replace the PD, you have to replace the whole rail but i kinda just said that.

for the fuel smell, i have no idea. could be leaking injectors, the PD, the fuel regulator, injector grommets, your charcoal canister, lots of things smell like fuel so you'll have to check around a little further. if you can't find it, i don't believe i am too far away to check it for you.

This is what i did. Cheaper than the Atkins Rotary rail.

https://cimg2.ibsrv.net/gimg/www.rx7...b9d059e0f1.jpg

Ill disassemble more of it tonight and try to get to the primary rail. Ill keep you posted on this thread and upload pics for you to check out maybe you can see something i cant. Im in fort myers and would really appreciate it if you could make it over some day soon. Cant wait to start having fun with this thing again. I feel like my best friend is ill haha

Is the PD cancelled? I like what you did. Can you hive me some more info on the parts you replaced?

Aeromotive fuel pressure regulators have a built-in pulsation damper function.

Note that OEM fuel line is smaller than 3/8".




https://cimg5.ibsrv.net/gimg/www.rx7...f760cb4382.png

https://cimg8.ibsrv.net/gimg/www.rx7...2aec773e08.png

https://cimg9.ibsrv.net/gimg/www.rx7...1a3a0a3179.png

must be a generic list, those rails aren't turbo rails.

I'm running them on my S5 TII engine right now at 8 psi. They fit. I think they're S4 Tii rails. Could always ask rotary resurrection.

the primary rail is definitely not a turbo rail, although very similar but it is from an n/a. the secondary is a turbo rail though. the turbo primary rail has a rib that runs down the center. the turbo rail has a slightly larger bore.

turbo
https://www.rx7club.com/attachments/...i-img_5926.jpg

n/a
https://i39.tinypic.com/14uuyl1.jpg

not my pictures by the way, i'd be embarrassed to use those crimps on an injector clip...

Actually now that I'm looking at it, the rib is there, its just hard to see.

Plus, on S4 NA primary rails, the PD and the banjo are on opposite sides vs the turbo rails. If this were the case, the banjo bolt wouldn't fit where it is at on my setup.

nope, i can tell you that definitely isn't a turbo primary rail, the turbo has a isolator so that the feed pipe banjo can only go on one direction like the secondary rail has. look at the right side of the rail in the first picture, you'll see the protruding casting. it's not a huge difference between the 2 rails but i figured you would want to know. kevin ought to have known this, not sure why he let that one slip.

Dont put the blame on Kevin yet because some things are coming back to me now. I recall the isolator, and I remember breaking it off so I can rotate the banjo a different direction. In the process of doing that, Im pretty sure i messed the rail up. I had a set of S5 TII Rails that came with my engine, but I believe I sold those. So the only other place I Could have got a primary rail was from my original S4 NA engine.

You win.

So i investigated a bit further last night and saw a ridiculous amount of gas by the primary rail. Do you guys recommend replacing all the manifold gaskets i have to remove or should i make a jusgement call and decide whether they look good or reusable or not? I really hope its an injector or grommet leak. Im trying not to spend so much at once. I found an s5 spoiler from a hatchback last night (i know it has nothing to do with this conversation lol) im trying to fit in (i have a vert/trunk lid) which im very hyped about haha.

Can you send me a pic of how you currently have it installed? And some guidance on how to hook everything up correctly? I might take this route if i find s4 rails.

wasn't broken either, you can believe me that that isn't a turbo rail or not, but i just wanted to make sure i said it with 100% certainty that it is not. the turbo rail accomodates a bigger banjo for better flow through rates and i see everything in your pictures that tells me it's the smaller n/a S4 primary rail.

not trying to get under your skin, just letting you know i am positive i am not wrong concerning it and wanted to be sure i pointed it out.

it will hopefully still do the job to 400whp for you(i haven't personally tested the limits of the n/a rails flow wise and how they bottleneck), but i wouldn't suggest trying much further than that. the stock turbo rails can flow pump fuel for upwards of 500whp, you only have half of a mismatch.

Youre not getting under my skin man. I agree with you now, after my recollection that it is indeed a s4 na rail.

Do you think im going to have flow problems with this rail? im about to have a tune and the goal is 15/16psi 375-400hp.

Edit, just read the rest of your post.

Is the difference in Diameter of the rail tube, or just in the banjo?

i'd have to check but i believe most of the restrictions are in the banjos and not so much the bore.

Maybe ill get some barbed fittings for the ends just in case. Thanks.

no problem man

Look what I found.
https://cimg5.ibsrv.net/gimg/www.rx7...a404dd6005.jpg

https://cimg6.ibsrv.net/gimg/www.rx7...8973aa7ef5.jpg

there you go