Fuel gauge reads empty all the time

FYI. I ran the cluster self check and got a code 999. All the gauges swept including the fuel gauge.

Also, when I turn the key to the "on" position the gauge jumps ever so slightly for a second, then nothing like it is getting a signal for a split second.

Thanks so much for the information. Before your reply I ordered a used replacement for the BCM. The van is my everyday driver and I need it to be reliable. One other quick question, would the BCM give a no spark symptom? I am replacing the cam and crankshaft sensors, the PCM and the BCM. Hoping to cure all its problems! The parts hopefully will be here by the weekend (ordered from online) and I can see what happens. I work during the week so it is sitting in the garage awaiting treatment. I will use your sent information in the meantime to see what I can find out. Again many thanks.

That should of been cure all its problems.

I have worked on the fuel gauge problem further. I have 2.5 volts at the DCL at pins 3 and 11 at all times. Next I checked the BCM connector at pins 3 and 34. Again 2.5 volts. What is my next step/s?I replace the cam and crank sensor, plus the PCM only to find out whacking the fuse box under hood will let it start. Thinking of replacing the fuse box/block? Still stuck on the fuel gauge though!

Also, ordered a BCM, but it wasn't the right one. If voltage is good on pin 3 and 34 does that mean the BCM is good?

I have the no spark problem located to the fuse block under the hood. A good whacking gets it going until I can locate a replacement.

So my problem is the fuel gauge. I did troubleshooter according to a forum I found. Testing power at the pins for the circuit before and after the BCM. The voltage is correct and the self check sweeps the gauges and gives a all pass. What would you check next? How can I determine if the wiring from the BCM to the gauge is good? I have taken the instrument cluster out twice and re-solder the connections. The back of the fuel gauge has 4 pins. Can I apply voltage to the gauge to confirm the gauge its self is working? On the ribbon that plugs into the back of the instrument cluster, which wire is the feed to the fuel gauge? At a blank on what's happening with the gauge. All other gauges work and the low fuel light is on all the time. If I need to I will re-check the fuel tank/sending unit, but even when I replaced the pump, the gauge still didn't work and the fuel pump wasn't the problem with it stalling out it was/is the fuse block in engine compartment.

Any ideas would be great!

Can I apply power to the gauge with a dimmer switch to see if gauge is okay. Starting to think it is the problem since the low fuel light stays lit. Also, do you know which wires feed the cluster for the gauge?

Thanks for telling me that, because I have studied that same diagram repeatedly! I always have stranger than normal issues, lol ! I searched for a cluster and not one to be found locally, and looking like a hundred dollar bill for another used one online, which i'm not sure will get it fixed. I bought the cam and crank sensors and a PCM only to find that wasn't the problem, I think it was the ASD rely, put in a new one so far has worked. Do you think just the gauge itself could be gotten from a dealer? Or is the cluster a whole unit always?

There are 7 wires going into the cluster:
pink m1
org e1
blk/lt gr z2
wht/blk o2
vio/br o1
red/wht f11
blk z1

any guess as to which feeds the gauge? I am going to remove the cluster yet again and see which has voltage. Shouldn't the gauge feed be variable voltage according to fuel level? Would that also confirm the system is working correctly up to the cluster?

Doing more research.

Looks like pins 9 and 10 feed gauge? Should those read 2.5 volts? Or variable? On BCM, what should pin 42 read? Are there fuses here that might be the problem? Or is it just the gauge needs replacement?

So that is pin 42 on the BCM?

I will check that tomorrow. I took the cluster out and switch the fuel and temperature gauge thinking it might be the gauge its self, nope fuel gauge worked in the temp spot and temperature gauge didn't work in the fuel gauge spot! I ordered another cluster! Waiting on it to get here. While I had it apart, I checked the voltage reading at the cluster (red) plug. Pink wire #2 pin 12.30 volts, orange wire #6 pin 11.34 volts, white/black wire #9 pin 2.47 volt, vt/br wire #10 pin 2.50 volt, rd/wt wire # 11 pin 11.50 volt. I have no idea what that means. Lol. Other than pin 9 and 10 feed fuel gauge and come from pin 3 and 34 in BCM. Which also read 2.5 volts. I checked voltage at the 4 connectors on the gauge its self and got these readings. Upper left 1 volt, lower left 11.44 volts, upper right 7.82 volts and lower right 5.75 volts. Again not sure what those should be?