I think I'm getting somewhere!
OK I went and got my hands dirty and learned a bit about how the fuel system is supposed to work. I now know that: Fuel is supposed to come from the tank, flow through an inline filter, then go somewhere at the bottom of the injection pump, get pumped back up into the canister filter and go back to the tank. Right? I'm still clueless as to what the red plastic line on top of the injection pump does.
What my car was actually doing: Well, nothing unless you pumped the purge valve very quickly, then fuel very slowly came up from the tank and barely made it into the inline filter. It would run if I kept the canister filter full, which had to be done by pouring it in through the top.
What I did: I bypassed the inline filter and red plastic line that makes the fuel go to the pump and back. I connected the line from the tank straight to the reciever underneath the purge valve and used the valve to pump fuel (which was much easier now with the shorter trip) directly into the canister filter.
What happened: The car ran continuously as long as I frequently pumped the purge valve. The idle would get rough as if running out of fuel if I didn't. A foamy mixture of air and fuel ( I could see it was now a B99/ULSD mix) flowed of the line at the top of the purge valve. This was the fuel feeding the engine, correct?
What else I learned: The nuts and possibly seals on the purge valve assembly seem too easy to loosen which causes fuel to slowly drip out. Perhaps running bio ate some rubber seals which are now letting in air?
My conclusion: The fuel pump is not doing it's job. I should have seals in the purge valve replaced with OEM/better quality parts, along with lots of other seals and hoses under the hood. Please correct me if I'm wrong. And if you've made it this far, THANK YOU THANK YOU THANK YOU. I would be permenantly up poo creek w/no paddle without the internet and the people who use it.
Here is a link to pictures and video:
The first video shows what happens when I throttle up the engine. The line coming from the lower side of the injection pump spurts some fuel, mostly air.
In the second video you can see me pump the purge valve, which will fill the line from the tank to the canister filter. Shortly after I stop, the line empties, and you can see fuel and air coming out of the filter on it's way to...? I can't remember, but it goes back to where ever it was designed to, I didn't change it. I think it goes to the pump because as long as I used the purge valve to fill the canister it kept running.
The third video is a longer, poorly lit version of the Second. I threw it in there just in case.