manifold + fuel rail

**amnash** · 09-02-2010, 09:51 PM

so i have recently installed new injectors to fix a leak, and the leak is still there. i have swtiched injectors around and the works and the leak stays at the 4th injectors no matter what. so my last guess is that there is something wrong with the manifold its resting on(stock)?
so i was thinking on going ahead and upgrading to a new manifold :
http://nozzs.com/index.php?main_page...products_id=13

and maybe a new fuel rail like this :
http://nozzs.com/index.php?main_page...products_id=29

what are the odds that its the manifold?

**R33rr** · 09-03-2010, 02:07 AM

are they local ?

**amnash** · 09-03-2010, 03:34 AM

not sure.. but they ship worldwide it says

**love_boost** · 09-03-2010, 03:34 AM

probably your injector cusions on the intake manifold itself. when you are raplace injectors i normally lube them with grease or i think assembly lube would work. or else you run the risk of tearing o-rings/cushions

**amnash** · 09-03-2010, 01:57 PM

im going to take all the injectors(12) to be leak/spray tested. ill pick the best 6. if NONE of the injectors have a leak..then my next guess is the fuel rail? i have 444cc GTR injectors with stock fuel rail. they seem to sit very loosely after installation, is that normal?

**Supraclean** · 09-03-2010, 08:22 PM

Im with Love_boost on this one, you have to check both the rubber rings/cushions in the manifold and on the top of the injector that goes into the fuel rail. I dout your rail would be bent or warped unless you lifted/pulled your engine out and attacked the rope or chains in the wrong spot.

**amnash** · 09-03-2010, 08:55 PM

hmm, well i have put in all new seals, and the fuel is coming from the top of the injector not from where it touches the manifold. (this problem has been on going for a month or so now)

**Slavg87** · 09-04-2010, 09:09 PM

Originally Posted by amnash

hmm, well i have put in all new seals, and the fuel is coming from the top of the injector not from where it touches the manifold. (this problem has been on going for a month or so now)

if its coming from the top, its the top o ring. pull out the injector and see if the o ring is ripped. also the injectors shouldnt be too loose they should fit nice and toight. maybe when you installed the injectors u didn't lube the top o rings and it twisted and possibly ripped. I would try to get a new o ring and try to install it and see what happens. make sure u lube it though.

**amnash** · 09-05-2010, 01:08 AM

yes, ive used engine oil for lube each time.. im going to inspect the rail and try test it somehow for cracks. ill let u guys know

**got_boost!** · 09-05-2010, 12:46 PM

I just put 444cc injectors in mine and the bottom O ring cushion was super loose as well and the top wasn't tight. All I did was take the top o rings off my old injectors on the rail side, put those on the sprayer side of all the new injectors, then sat all those back into the cushion o rings and tightened everything down. The extra and smaller o ring sealed the whole deal up and also raised the rail an extra 1mm or so, so I could tighten everything down snug. Had the thing dynoed and been running it a few weeks now and no leaks and no performance loss from having the injectors just that little bit shallower in the manifold. Maybe try that?