Fuel Leak after injector install

Rattlin_Ram

Rattlin_Ram

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Aug 8, 2007
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I finally got around to installing my injectors this week, and now I have a pretty bad fuel leak, but I can't exactly tell where it is comming from. It looks like it's from the back injector but I can't tell exactly. I didn't have a crows foot to torque down the fuel lines, do I need to get one? I used a stubby (cut off) end wrench to get to the back injector. The rest I just used a regualr 19mm end wrench and tighened everything up.

Where else should I check? Should I back off all the injector lines and retorque them?

I'm wanting to take the truck to a drag strip this weekend, but can't with this leak...
 
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You may have cross threaded the #6 line going into the cross tube. I use a short 3/4" wrench and have changed my injectors I dont know how any times and have never had any leaks. Also did you make sure the end of the fuel line was seated in the cross tube?
 
before you go freaking out about cross threaded lines, you need to figure out where the leak is coming from. last time i swapped injectors i noticed fuel leaking (left huge puddle under truck) out of the head through the threads at #3....it turned out to be a bad oring on the cross tube. that oring LOOKED okay, but since those orings are so cheap, i bought 6 of them and had it fixed in less than an hour with 6 fresh rings
 
I don't think the injector lines need to be cranked down too tight. I've heard over tightening them can cause leaks.
 
What is the torque spec for the injector lines? And I didn't inspect the o-ring on the last connector tube sine I didn't pull it all the way out to put the injector in... That could be my problem... I wish that the engine was about 3-4" further forward in the engine bay... ;) That'd make it a lot easier!
 
What size are those o-rings if I go to buy some today before I go home also??? Anybody know?
 
Rattlin_Ram said:
What is the torque spec for the injector lines? And I didn't inspect the o-ring on the last connector tube sine I didn't pull it all the way out to put the injector in... That could be my problem... I wish that the engine was about 3-4" further forward in the engine bay... ;) That'd make it a lot easier!
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i thought the same thing the frist five are easy sixth one a ***** lol
 
coon smile said:
....it turned out to be a bad oring on the cross tube. that oring LOOKED okay, but since those orings are so cheap, i bought 6 of them and had it fixed in less than an hour with 6 fresh rings
Click to expand...

Those suckers cause hard starting too!!!

i know of at least 4 trucks who had theose Orings replaced in the last few months, in my truck the oring looked really bad, and sucked air, lost prime, = long crank. even with the fuel pressure gauge showing its 15 psi, it doesnt start right up! Just thought this might help someone. since they do get bad!

BTW for Rattlin Ram, i replaced injectors on a 06, i found it eassier with the piece removed that they use to lift of the head...

you could also remove the line protector thats bolted to the rear of the head with 2 bolts (you use a 13mm wrench for that.) I had mine not tightened down enough, for the lack of space to wrench
 
Are those o-rings a standard size? I have a big box of o-rings in my toolbox at home that I bought just have around...

Not sure the dealer here would have them in stock if I have to go there...
 
I bought some orings from a hardware store. I havent put them in yet, but I tried to get them from the dealership and they only listed orings for the injectors themselves.
 
I had a bad oring on mine, I just replaced it with a standard oring from the kit...it fit a little tighter, but that could be because of the new oring....
 
I replaced a couple o-rings and it's still leakin. I replaced number 2 and 6 o-rings since they seemed like where the leaks where.

I read in another thread you should tighten the injection line nuts before the injector keepers to make sure the connector tubes get seated properly. I didn't do that, i dropped the injector in, snugged up the keepers with my fingers, and moved on to the next one. Then I think I torqued all the keepers before I put the lines back on... I noticed some of my nuts on the injection lines don't seem to be in as far as the others...

Should I tear it all back apart and re-adjust the injectors to make sure the tubes are seated?

I think I'm making this more complicated than it needs to be... but I'm getting pretty good at getting back to #5 and #6!!! lol
 
Rattlin_Ram said:
What is the torque spec for the injector lines? And I didn't inspect the o-ring on the last connector tube sine I didn't pull it all the way out to put the injector in... That could be my problem... I wish that the engine was about 3-4" further forward in the engine bay... ;) That'd make it a lot easier!
Click to expand...

30 ft. lbs. for the lines. Thanks Steve B.
 
It might not hurt to pop them off and check it out. When I do injectors I always try to push the connector tubes in once the injector is seated. If it goes in the same all the way down call it good and button up.
 
I got the fuel leak stopped! My last leak was caused by #2 just needed another 1/4 turn or so and it stopped leakin... it was leavin a puddle....

Got it fixed just in time to get it washed and run up to the 1/8 mile track! Thanks guys!

BTW first time ever at the drag strip it ran 9.5 in the 1/8th with me not boostin it very hard, then boosted it up and I ran 8.9's all night till I red lighted against a stock D-max in the semi final round....
 
Oh and I'm runnin 33" tires and 3.55 gears for those times... I think I can get it down, cuz my reaction time sucked! lol
 
for future reference...i purchased those orings for the cross tubes from cummins. just told them year, model of engine, and which orings i was looking for. they were in stock
 
Th O-rings are not a standard size but a Cummins store has them for $1.26 apiece.
The FSM calls for 30 ft/lbs for the high pressure nut torque.
 
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