Since I already interrupted this thread, I'll finish the LJ tech clutter!!!!
A few random pictures, notes, and heartache!!!
The sump in the middle of the tank that the fuel module sits in, note how the inside of black plastic tanks is silver/grey??
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The OEM fuel pump module - "cup/reservoir" at the bottom that holds fuel/pump, sending unit in the bottom, pressure regulator up top, spring loaded legs, I would assume similar to late model GM stuff??
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Inside the tank, looking at the filler hole, this little jewel can cause you problems, besides just trying to siphon fuel!!!!
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That white cylinder can detach from the "welded on" fuel fill neck, from inside the tank. Inside it is a ball, seal, spring. The long stick guides it inside the plastic cylinder, but the inner assembly also slides on three plastic "tracks". In the picture above, it is stuck down, probably from me jamming a siphon tube into it. It popped back up once I filled the tank. Anyway, if your TJ/LJ/JK sprays gas at you when the tank nears full while filling it, this little jewel is the problem. It will stick, causing all kinds of issues. I assume this is an emissions/safety device, keeps gas fumes from migrating up the fill hose, will keep liquid fuel from spilling out of fill hose if you roll the Jeep. On a CJ, there is a BIG fuel fill AND vent hose. On this LJ, only a fill hose. I presume this doo-hickey works with other doo-hickeys on the tank to allow the tank to vent while you are filling up. Anyway, on this LJ, no problems with this doo-hickey. If you have issues, you can remove it, lightly sand down the tracks/ridges" to get the ball assembly sliding smoothly and fix the problems. Some people swapped on a GM filler hose, but that is a band-aid fix. To fix it right, drop the tank.
Since I had no issues with the little doo-hickey, I left it alone.
You can see why it is a bitch to siphon fuel out of this thing!!!! Also, not pictured, inside the "welded on" plastic filler neck there are four "L" shaped fingers blocking access. No idea what purpose they serve???
One other note - I am not a TJ/LJ "expert", but I will tell you the 2005-2006 models are nothing like the 2004 and earlier models. The 2005 and 2006 models have an advanced tank evap emissions system, more similar to a JK. There is a "pump" up in the passenger side body (behind tail light" that will pressurize the tank when the PCM commands it to. There is a pressure sensor doo-hickey in the top of the tank, that will check to ensure the tank/system maintains pressure. Basically, if it holds pressure, the PCM knows it is not leaking gas fumes. If it does not hold pressure, you get a CEL. I did not have to mess with any of this crap, BUT I was also super careful with all the associated lines/connectors I had to mess with to drop the tank. It would be a PIA to try to diagnose an evap leak, fix the problem, to clear the "Check Engine Light"!!!!!! I would presume you would have to "smoke" the system to check for leaks, but you would also have to ensure pump/sensor are working properly.
Also, I never saw a "charcoal/fume" canister anywhere, unless it is up in the passenger side cubby hole behind the taillight. A vent line runs from the tank, up under the hood, to a purge solenoid, straight to the intake manifold. MAYBE this system holds the fumes inside the tank until you start up?? Just a word of warning about all this crap, tread lightly!!!!!!!!!!!!!!!!!!!
New pump installed, key "primed" three times, LJ fired right up!!!!!!!!!!
I did NOT receive my Bosch fuel pump module, UPS screwed me, so I installed a Delphi unit from NAPA. This was my 2nd choice. But, I made the NAPA store manager sign the box!!!!!!!!!!!!!!!!
View attachment 99854
"I WILL DROP EVERYTHING AND COME HELP RAYMOND REPLACE THIS POS PUMP WHEN IT FAILS, NO IFS, ANDS OR BUTS ALLOWED OR NOTED OR IMPLIED SO HELP ME GOD.
1/18/22"
Signed by Jeremy
Witnessed by Austin
In all seriousness, the module has a life time warranty, AND after doing it once, I can repeat the entire remove/install in under 2 hours IF the tank is close to empty. Not the best, not the worst, is what it is.
Now the heartache - I get to drop the tank again, next week, once it gets close to empty!!!!!!!
I installed the lock ring like so:
View attachment 99853
This is not "correct", BUT it is locked into place, can not come loose. I installed it and removed it several times, it takes a hammer and punch to break it free. But, it is not "correct" and will drive me crazy!!!!!!!!
On my initial removal picture, you can see how it is supposed to be, basically 180 degrees out:
View attachment 99858
Should have looked at this damn picture yesterday LOL!!
So, I will drop it again next week, install the lock ring "correctly", and sleep better at night.
For now, pump works, fuel gauge is accurate, no liquid or fume leaks, no CEL. Will get it 100% next week
And, this LJ is rust free/unmolested/not damaged or modified, so it a pleasure to work on!!!!!!!!