Fuel rail leak - LN2 - need some insight - Performance Forum

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Fuel rail leak - LN2 - need some insight
Wednesday, October 04, 2006 8:54 AM
I'm finishing the rebuild on my friend's car - finally - but I have a small issue. The return line sprung a massive leak when I had him start the car to check for leakes and such. Amazingly, this is the only leak but it's being a pain in my arse. I know full well it's the O-ring - the original one was missing - I'm guessing it broke but the car sat for two months so who knows what happened. ANyway I've gone through all the O-rings I had in the garage and none of them seemed to be the right size. Hell, I even tried some O-rings I have for my paintball guns - I even doubled a couple up on the fitting; that worked for a couple minutes then it started leaking again.

It's kind of funny this morning, after I got a little sleep. I put this motor back together yesterday morning, dropped it in, and didn't even get the car to start until nine last night - and the one thing that's keeping it off the road is a fricken O-ring. Not a coolant line, or a gasket leak, not a ticking lifter or a timing issue, not the ignition or a ground strap loosen not a sensor left unplugged or a vaccum line in the wrong place. A FUKKING O-RING!!! ARRRGH!!!

Pardon my rant...

Anyway, if someone knows what size O-ring I actually need or any other suggestions I'd really appreciate it.




Re: Fuel rail leak - LN2 - need some insight
Wednesday, October 04, 2006 9:09 AM
I can take a measurement when I get home tonight if needed. What year do you need?



fortune cookie say:
better a delay than a disaster.
Re: Fuel rail leak - LN2 - need some insight
Wednesday, October 04, 2006 10:05 AM
It's a 97. Thanks, Josh.

How I missed the fact that the O-ring wasn't there when I hooked the fuel lines back up is beyond me. Tunnel vision, I guess. Twelve hours straight working on an engine will do that to a guy.



Re: Fuel rail leak - LN2 - need some insight
Wednesday, October 04, 2006 12:30 PM
That's alright, my Audi developed a good fuel leak on the feed connection the other night (after I JUST fixed the oil leak). Turns out that line doesn't even use an o-ring, just a metal washer



fortune cookie say:
better a delay than a disaster.
Re: Fuel rail leak - LN2 - need some insight
Wednesday, October 04, 2006 1:41 PM
Chevy wouldn't make it that easy. I have all sorts of washers. And now all sorts of O-rings covered in fuel, so they're pretty much uselss for my paintball guns now. Did I mention I hate this car?



Re: Fuel rail leak - LN2 - need some insight
Wednesday, October 04, 2006 5:51 PM
The problem is the metal washer is built into the braided fuel line fitting, so it's not replaceable, and the fuel line a single section all the way back...
If you're tired of that engine send it to me, I need a '97



fortune cookie say:
better a delay than a disaster.
Re: Fuel rail leak - LN2 - need some insight
Wednesday, October 04, 2006 10:38 PM
.7" OD, .5" ID



fortune cookie say:
better a delay than a disaster.
Re: Fuel rail leak - LN2 - need some insight
Thursday, October 05, 2006 3:42 AM
Uhm... i was thinking for some reason that there's 2 o-rings for that return line? Had some kinda issue with this on a friends car after doing a head gasket. It wasnt leaking bad, but it still was leaking.

I'm not sure, it's been a while, I dont remember what it was. But I coulda swore it was 2 different o-rings.





Re: Fuel rail leak - LN2 - need some insight
Thursday, October 05, 2006 5:14 AM
There may be one after the FPR as well (the one I measured was between the FPR and 'rail'. I can't find my return line anymore to see...



fortune cookie say:
better a delay than a disaster.
Re: Fuel rail leak - LN2 - need some insight
Thursday, October 05, 2006 5:37 AM
Yeah, on the passenger side there's a return line coming out the back of the rail. It's next to the #1 intake runner, below the EGR and the ignition wires.

And believe I'd send it to ya, Josh. But Jay would be very unhappy with me cuz he would be without a car yet again, thus defeating the entire purpose of fixing this glorified paperweight.

But anyways, I did get it fixed. I managed to find a couple rings jsut slightly thicker than the two I doubled up - I have no idea what size they actually are but it doesn't leak anymore and the car runs like a champ.

Woo hoo!!



Re: Fuel rail leak - LN2 - need some insight
Thursday, October 05, 2006 9:47 AM
The line on the passenger's side is the feed line, not the return If anyone needs measurements for that I think I still have it. However, it's always easiest just to go to the dealer and point to the piece on their assembly diagrams



fortune cookie say:
better a delay than a disaster.

Re: Fuel rail leak - LN2 - need some insight
Thursday, October 05, 2006 10:55 AM
Fricken frack frack frocker frock frock... * Man I really need to get some sleep. My left is my right and my up is down I'm all wet and confused and where the hell am I anyway?! Yeah. The feed line. Not sure why I said return line given the FPR is on the OTHER side of the rail.

But hey, it's fixed dammit!





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