Leaking injectors
Senior User
Joined: Dec 2007
Posts: 108
Likes: 2
From: Colorado Springs, CO
Where are you noticing the leaking, injector lines or return lines? A return line kit is pretty inexpensive; you get new connections, rubber lines, and O-rings. The injector lines are more expensive and have to be ordered for the cylinder that is leaking.
Any trouble starting the truck after it sits a couple hours or overnight? that would mean fuel is leaking out of the lines and leaving air in its place.
Any trouble starting the truck after it sits a couple hours or overnight? that would mean fuel is leaking out of the lines and leaving air in its place.
Thread Starter
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Senior User
Joined: Feb 2009
Posts: 117
Likes: 0
it was not leaking from the metal fuel lines. it looks like its squezzing out of where the injector screws down to the "Manifold???" I am not sure what its called but its like a manifold is on gas engine
Senior User
Joined: Dec 2007
Posts: 108
Likes: 2
From: Colorado Springs, CO
which injectors are doing this? The cylinders are numbered 1-3-5-7 on the passenger side front to back, on the drivers side they are 2-4-6-8 front to back.
The reason I ask is on my truck there was some fuel in the valley pan (area beneath the intake manifold) that kinda collected at the back (between cylinders 7 and 8). Found that the injection pump had a bad o-ring on the supply line.
The reason I ask is on my truck there was some fuel in the valley pan (area beneath the intake manifold) that kinda collected at the back (between cylinders 7 and 8). Found that the injection pump had a bad o-ring on the supply line.
Thread Starter
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Senior User
Joined: Feb 2009
Posts: 117
Likes: 0
nah not really. I mean when its cold it takes a few turns but i wouldnt say its hard. I figured maybe b/c its been a little cold outside
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Senior User
Joined: Dec 2007
Posts: 108
Likes: 2
From: Colorado Springs, CO
Would you consider replacing the injector? If you do that, it would be a good idea to replace the fuel return lines for all your injectors at the same time.
Replacing the injector will tell you what the thread situation is in that injector hole, if the injector is cracked, or if you have a dead cylinder.
Moderators - Would carbon buildup on the pre-cup close it off sufficiently enough to cause the fuel to weep out the threads rather than blow through to the cylinder?
Replacing the injector will tell you what the thread situation is in that injector hole, if the injector is cracked, or if you have a dead cylinder.
Moderators - Would carbon buildup on the pre-cup close it off sufficiently enough to cause the fuel to weep out the threads rather than blow through to the cylinder?
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Senior User
Joined: Mar 2006
Posts: 162
Likes: 0
From: sisters or.
Hi,the return line kit sounds like a good approach most common cause of those kind of leaks comes from the 2 o-rings on the top of each injector under the plastic caps.pretty easy and cheap fix.I would start there.good luck.
Norm
Norm
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
I think its unlikely that the injector is leaking from the high pressure side. If it was the engine would not run right. Leaks at the return lines don't always cause hard start problems. My truck has slightly wet O ring connections under a few injector tees and and it still starts fine. I think you have injector O rings that are leaking. If they were recently replaced, then its possible that some were not seated properly to seal in place. I had that happen too and it was enough to push a pretty steady stream of fuel out from the connection.
Not a big deal to fix, but you might have to take a closer look at the offending fuel return tee and the O rings under it. Look how high the tee is on the injector body and compare it to the other ones to see if its seated down all the way. If it is all the way down, then you might have to take the tee off again and inspect the O rings or the tee itself for damage. Any scratches of nicks could prevent a proper seal.
Not a big deal to fix, but you might have to take a closer look at the offending fuel return tee and the O rings under it. Look how high the tee is on the injector body and compare it to the other ones to see if its seated down all the way. If it is all the way down, then you might have to take the tee off again and inspect the O rings or the tee itself for damage. Any scratches of nicks could prevent a proper seal.
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Lube is always a good idea when assembling parts with O rings (as long as its not in the cooling system). Diesel tends to be a little sticky if you push too hard when installing the tees. A little gear oil or clean grease would probably help.