D12 fuel trouble

Your crossover feed lines that balance your fuel between tanks might be acting up. They can be finicky. Try topping off both fuel tanks.

 

It sounds like you might be airlocking. Did you fill that fuel filter you changed to the top even though you have the pump. That might fix it and it doesn't cost anything to try. If the old filter was bad but you didn't get fully bled by filling the new filter with fuel this could have created an air lock that the pump can't get past.

 

It's full from the hand pump or full from you filling it to the top before you put it on?

 

And how tight is it?

 

All of your new connections I would look at. -- You can just about bet that your getting air from one of them or none of this but something entirely different in the first place.

What was it doing from the first symptom on, at the very beginning before you did anything.

That hand pump itself could be leaking.

 

I'm guessing that the pump is about a million dollars. I would keep doing everything you been doing over and over again hoping to get lucky and cure it or find the problem or it to just start working without knowing exactly what you did. A few hours a few times.

Then the computer readings. Or the computer readings first if you can afford it but the computer may not show a simple connection or air leak problem. That's why I would exhaust everything first. I'm not sure if you could try a direct fuel line put in your filler opening and to the filter as a bypass that might tell you something. I shudder to think what a fuel injector pump would cost. Especially if you don't need it.