Bad relay SOCKET? It does happen. It honestly sounds like the relay (which you changed 99 times, lol) or socket is bad. I mean, you jump A6 and A7, and it starts. That means everything is working except that part, right?
You need to make sure the relay is actually working. Basic stuff: are you getting voltage to the coil? If so, are the contacts changing state?
That's what I would check. Disconnect the wiring except for the coil, check coil with voltmeter, check contacts with ohms. Easy stuff. (but I work on stuff like this all the time, lol. Sorry.) Check it in circuit, then check it out of circuit with a battery. I'm really curious. If it was my jeep, and I'd had it sitting for well over a month, I'd be insane.
I've punted the ball back to the mechanic after several days of this kind of stuff. Probably why my old charge cards were maxed out.
Take the relay out, and check it like I posted above. You have to be 100% sure it works.
No power on relay - connection using ohmmeter between A9 and A6.
Power on relay A10 and A8 - connection using ohmmeter between A7 and A6.
After you do that:
Check voltage to the coil when your ignition is ON. You should have voltage. If you have voltage to the relay, and the relay is activating, A6 and A7 SHOULD WORK. If not, I would look at the socket or wiring.
BUT first, I took the PDC apart and the wire connections into the socket are solid! no corrosion, no loose wires. All looks good.
Will get back a you with the test results.
BTW.....on a side question, do you know where the grounding strap for the GAS FULLER TUBE connects to the body? When i removed the gas tank, the grounding strap broke. I got a new one but can not find the location were it connects to the body or other grounding location....
A9 is the other side of the relay, used or not. when you check these, it's good to know the relay doesn't "stick". Sounds good, though...
If the relay is working and jumping the connections works, there's a socket problem. Can you wire it direct, without using the socket? You've shown the connection works, and the relay works. There's only one thing missing as far as I can tell. I'm going to go out and take a look at mine, though, just to get my thinker moving better.
I glanced over this but.... the question you need to ask is: where are you getting fuel to?
I recently changed a fuel pump located in the tank of a vehicle. It had a low pressure pump in the tank and a high pressure one under the vehicle.
Everything worked great, for a while. The vehicle would die sometimes, and then, start back up. Everytime I tried to troubleshoot it, it worked like you would expect it.
It finally died one time while I was in it, so we toed it back to my place. Yeah, you could hear the pump engage, but the new pump was bad. I disconnected the lines until I found that the one coming from the tank didn't put out enough gas. I replaced the new pump with a "newer" pump and...problem solved. no more shut offs.
Like I said, I glanced through this thread so I don't know what all you've tried but seeing fuel actually coming from a line means more than hearing a damn noise from under the vehicle. and yes, a new pump can be bad. Already been there with Autozone chinese crap.
You need to make sure it's pumping gas and that the lines arn't cinked up.
When I too the A10 connection and DIRECTLY GROUNDED IT the GAS FLOW STARTED.
So, I am looking at a ground problem. BUT the A10 terminal GOES straight to the PCM.
I check Continuity from A10 to terminal C19 for the plug that goes into the PCM and the continuity is fine. So, the issue is either AFTER the PCM.....( where does the terminal C19 lead inside the PCM and where does it go) or the PCM itself which I just paid to have refirbished......
It could be something in the pcm logic causing it to not turn on the pump.
Check the grounds first, but if that dead ends you should look into that.
Also, check for voltage with the key on going into the pcm terminal that is supposed to be ground for the relay coil. I know it may not make sense, but it will tell us something. Anything less than battery voltage means you have high resistance in the circuit.