Just replaced my entire fuel lines including cooler.
Upon startup I found this. I’m 99% sure it’s not the new lines as the flex hoses are dry as far as I can tell. The injector where the fuel appears to be coming from was wet when i began the tear down and the whole area was really dirty as if it had fuel on it.
Wow.
Thanks.
May have been weak when I replaced the lines and I may have bumped it while reinstalling the fuel lines.
So how do I search for a part number? It’s not like GM provides us common folk schematics. 😂
You may be able to purchase a single fitting from one of the vendors I this site. I believe Lincoln Diesel Specialties has them. They also make metal return fittings for these that last longer as the plastic gets brittle due to heating and cooling cycles. The metal fittings are a bit shorter than OEM so you may have to route the line differently. Trick is to install the metal clip FIRST then push the fitting into the injector. Any other questions shoot me a message. Have a good day.
Here is a link to the part you need. You will have to purchase the whole line if you get it from the parts store or dealer. And from my personal experience, Dormant aftermarket fittings are garbage and don't last. Stick with OEM or metal fittings.
Well things have taken a turn for the worse. When I pulled the fuel return rail off of the injectors two of them broke apart coming out and I’m confident left debris in the top of the injectors. Middle two cylinders on the drivers side.
Lost and not sure what to do.
Use a screw and try to screw into the broken piece. Then pull it out. That is a return line so you don't have to worry about injector contamination. When you put the new t in connect the hoses but leave the one that comes off of that one towards the firewall off. If there was any broken pieces they will be washed out once you start the truck. Then re attach. The returns run front to back. So two goes to four to six to 8. As in cylinder numbers. Hope that helps. Message me of you have any other questions.
I did buy the whole kit though. I needed this truck on the road two weeks ago. I’ve got a small lawn care company in addition to my day job and I’ve made commitments to clients and the grass is just a few days from being ready to mow. Twenty some odd customers would not be happy.
I did buy the whole kit though. I needed this truck on the road two weeks ago. I’ve got a small lawn care company in addition to my day job and I’ve made commitments to clients and the grass is just a few days from being ready to mow. Twenty some odd customers would not be happy.
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I think what I’m going to try is a large syringe. I’ll attach a small hose to it and force diesel down the return hole flushing any debris from the fittings onto my garage floor. I mean what’s a little more diesel at this point right? 😂
I’ll then install the new lines.
I am struggling to remove the line that goes along the firewall. Just doesn’t want to budge. Can’t even see where it goes.
Been thinking about the issues I’ve had with this truck over the last 16 years and I’d bet 90% of the issues were related to corrosion. I mean it’s crazy. Brake lines rotting out and now the fuel lines doing the same.
So I think I’ve got the injectors free of the plastic fittings that broke off when I removed them. Now I’m trying to figure out how to remove the return line that goes into the manifold. Ironworker15 I believe you mentioned glowplug module how do they release? Don’t want to break them.
The one on the left you squeeze the tabs and pull. The other one there is a slide on the right side that you pull out to release the plug. Look up LBZ glow plug module release and you'll get pics. Then take the bracket off. It's 4 12mm head bolts. That should give you access to the fuel rail.
I lost two retaining clips. No clue as to where they went. Can’t find the part number. I tell you it would be much easier if GM provided parts schematics. What the hell are they trying to hide anyways? So we all don’t go running to RockAuto?
I thought I had all of the plastic out of the injectors but when I went to put in the new fittings they didn’t insert all the way. Because I’m not a full time diesel mechanic I was unfamiliar with injectors so when I looked in the top by taking magnified pictures I didn’t see any plastic. I just saw a rusty cup and diesel.
I’ll be the first to say it’s not easy to remove plastic from an installed injector. But I did it.
Now I still have to reinstall everything that I disassembled to get to everything. Good call on the removal of the glow plug module. Not to say I’d ever want to do it but I had so much stuff disassembled that with a few more things removed I could have changed out the injectors which have always intimidated me. But being an LBZ and not under the valve covers I’d call it doable.
Local parts stores won't have the clips. And the dealer will charge you $20 a piece. BOSCH Fuel Return Line Clip. Lincoln Diesel Specialties has them and I'm sure other vendors here do too. Glad the screw trick worked and you were able to get the old plastic out.
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