88t2romad

I'm having trouble with a fuel leak on my primary injectors. I'm using KG rails in conjunction with RC 750cc injectors. The o-rings are in place and I'm using these http://www.mazdatrix.com/c-6.htm grommets....

Has a anyone else ever had issues with a fuel leak? They held up fine until i adjusted my fuel pressure a little bit(about 20 psi at idle). I have a fairly good leak going down both injectors. Anyone have other grommets they use or suggestions for me?

-Ben

Busted7

Are you using the aluminum spacers?

skir2222

Could you post pic's of your primary's installed? As busted stated there should be a spacer between the rail that bolts down to the engine, and the block.

calculon

iTrader: (29)

I've had a good bit of trouble with the quality of my KG fuel system. In my experience, it is a very poorly designed and fabricated fuel system. Mine came with 90s to go into the ends of the fuel rails, which is a VERY bad design from an engineering standpoint being that threads tighten at a certain point. . .that point is not necessarily a point where the 90 is facing the correct way. Additionally, the tolerances for the ports in the rail that supply the fuel to the injectors are very loose. You may have noticed, as I did, that some injectors you need to practically use a press to get in, while others will just fall right in (and out). Go ahead and take a caliper to those ports. . .I found a difference of +-0.08x"! The SS braided lines weren't built properly, and about half of them leaked at the hose ends. . .Ultimately, very poor execution.

As with all things, I'm sure he has dozens of satisfied and dissatisfied customers. I unfortunately, am one of the dissatisfied. Hope your solution is as simple as some new o-rings.

93FD3S

I've had 0 problems with my KG kit. Its been on my FD for about 2 years now. I've even pulled it off a couple of times to change motors. Quality is good to me. Check with Keith at KG, I'm sure he is more then willing to help out. When I bought my kit from him he was super nice and had excellent customer service.

GoodfellaFD3S

iTrader: (213)

^^^Yup, I 100% agree. Keith is a great guy, and has excellent customer service in my experience

Busted7

No problems here either!

Marcel Burkett

It is possible that you could have damaged the O rings on installation (ask me how I know !) , make sure to use some lube on them , so that they slide in easily .

EZFD

i didnt have a problem with the primaries, but i am currently having a problem getting the secondaries to seat right, i guess it's just trial and error getting the o rings to seal and to put enough pressure on the injectors from the rail.

Asleep

I've always had problems with my setup....especially when I take it apart to put back together again. Not Keith's or anyone else's fault. My rails are nice and tight on hole diameters. I have an early run. And I didn't get the whole kit...just the rails. I have installed over 4 sets in cars and once you get them set up correctly they work fine. These were all early run.

One thing I did find to improve performance but at the cost of ease of use/install is to not use 90's in the rail-to-AN adapters. I always try to use 90 or 180 AN smooth flow fittings. The big bends make it harder to get the system installed but it can be done multiple ways. Additionlly, ignoring concern for the cost of AN hose and running coiled lengths (where possible) rather than short sudden direction changes helps in removing pressure drop.

I make my own spacers from Viton hose. I can reuse them from most install/reinstall cycles. I run 860 and 1680 top feeds. I did find that trying to use 1000cc top feeds (different style of injection than the Bosch) added to the pain and proneness to leakage. Bigger shoulder injectors did not work with my home grown spacers in the primaries.

I always found Keith always willing to help out in a pinch or address a problem. If you give him feedback directly, I am sure he will make things right.

An asset to our Rx-7 world.

Tony

calculon

iTrader: (29)

I wasn't trying to bash him. . . I was the second person that got a 3-rotor fuel kit from him. . .as such, the ss lines were less than ideal in terms of fitment, and they were poorly built. It wasn't a big deal, I just had to reassemble some of the hose ends, it's not like they were faulty.

The injector port tolerance was easily corrected with additional o-rings.

One thing that I stand by though, is that 90s (that aren't swivel seated) have no place being the first piece connected to the fuel rail. They should either be swivel 90s, or just straight fittings that you have a 180 hose end connection mating to. That way the torque spec can be met and the orientation will be independant of that.

Keith is a cool guy to deal with and always easy to get in touch with. I hope my comments weren't perceived as bashing him.

88t2romad

Thanks for all the replies, I have taken the injectors and rails out and working on getting the o-rings/grommets in properly....and boy is it a PITA!! I took a closer look before i removed everything and it seemed like the injectors were a little tweaked, and not sitting properly, so I'll try a few adjustments here and there and see what i get.

And I think my spacer was installed improperly......it was there but it was above the rail-engine mount, not below, which I'm thinking is where it should be. Can anyone confirm this?

-Ben

kabooski

major fuel leak issues with KG rails
had to fabricate to make them seal............

Next time I'll make my own rails out of stock that will not only seal better but
will flow WAY more..... KG rails are smaller then stock
there just made for easy aftermarket plumbing not for increase over stock

bryant

in my case i used second gen injector grommets for my 1000cc primary's.

and you do have to get it in tdc.