Return line replacement question
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Freshman User
Joined: Mar 2010
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Return line replacement question
I was about to replace the fuel line kit, and I noticed that on top of the injector right up front, on the passenger side, it varies from the other 7. It has a cap like fitting above the plastic T cap that I am going to replace. I was wondering what that caps was, and or purpose, and how it removes? In other words the fuel line cap screws down into this part, and then the return line kit T is below it. Any replies appreciated.
Cargo Master
Joined: Oct 2008
Posts: 3,330
Likes: 13
From: Eaton, CO
Here's the front most passenger side one on my truck. Notice the large gap between the plastic cap and the fuel line nut:
Now here's the one directly behind it. Notice the next to zero gap between the plastic cap and fuel line nut:
Am I missing something on that front passenger injector/cap?
Now here's the one directly behind it. Notice the next to zero gap between the plastic cap and fuel line nut:
Am I missing something on that front passenger injector/cap?
Post Fiend
Joined: Oct 2007
Posts: 10,501
Likes: 5
From: Faibanks Ak.
Nothing is missing, it is possible that it is not snapped all the way down, but I think that is just how some caps fit.
There is a member that puts one of his old orings between the T and the line nut to hold the cap firm. I have never done this but can see the logic behind it.
There is a member that puts one of his old orings between the T and the line nut to hold the cap firm. I have never done this but can see the logic behind it.
Cargo Master
Joined: Oct 2008
Posts: 3,330
Likes: 13
From: Eaton, CO
I believe I torqued that line down pretty tight. I was a bit concerned when I realized it didn't go as far down as the others. All of the other caps and nuts have next to zero gap in between them and they aren't leaking. Only that one there with the big gap leaks. I'm going to do the o-ring trick on that one there and hope for the best.
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Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
mv1967 your engine muct be a 7.3.
The 6.9 engines did not have the timing pulse sensor that I think you are asking about.
You can see the pulse sensor in this picture.
When you unscrew the injection line from the sensor, use a second wrench to keep the sensor from turning, after the injection line is off, then turn the sensor off.
Install exactly the same way in reverse order.
The 6.9 engines did not have the timing pulse sensor that I think you are asking about.
You can see the pulse sensor in this picture.
When you unscrew the injection line from the sensor, use a second wrench to keep the sensor from turning, after the injection line is off, then turn the sensor off.
Install exactly the same way in reverse order.
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Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
My engine is a 6.9, but I am running a 94 turbo 7.3 injection system sorta.
"Not exactly stock"
So those are 7.3 injection lines, and since the #1 line is shorter because of the pulse sensor, it has to be on there with the line.
"Not exactly stock"
So those are 7.3 injection lines, and since the #1 line is shorter because of the pulse sensor, it has to be on there with the line.
Thread Starter
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Freshman User
Joined: Mar 2010
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hey dave, it is a 7.3. Everything has been a breeze until I got to it. The thing is dry as a desert bone compared to the other 7 fuel line tops. I am backing up with a second wrench. Did not want to break loose to save my life. Have the penetrating oil working on it now. I knew everything was going too good to not have a hangup somewhere along the way.
I'll probably snap the head off the injector. hehe
My friends have always said i could tear up a ballbearing.
That is one clean engine Dave, you must have clicked that photo off the assembly line plant.
I'll give it another go in a few minutes after the penetrating oil sets in.
I'll probably snap the head off the injector. hehe
My friends have always said i could tear up a ballbearing.
That is one clean engine Dave, you must have clicked that photo off the assembly line plant.
I'll give it another go in a few minutes after the penetrating oil sets in.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
The assembly line was my driveway several years ago.
Here is a shot from a little farther back.
I put a few dollars in machine shop work just to make some Cummins and Stroke drivers scratch their heads.
Here is a shot from a little farther back.
I put a few dollars in machine shop work just to make some Cummins and Stroke drivers scratch their heads.