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You shouldn't have bubbles in the supply line at all. This tells me you are sucking air from somewhere, Check and tighten all hose connections and look for cracking in the lines up to the filter and to the pump. Put a clear line temporarily on the pump to return line, I'd also suspect the sensor on top of the fuel filter, those are prone to seal failure and a source for air getting into the line., put a plug in place of it with a little fuel resistant sealer on the threads. I think it's 1/4" NPT IIRC You don't need the sensor unless you have the expensive diagnostic stuff to use it. When you don't see air bubbles going through that clear line anymore, you've found the problem and I bet your truck starts. The way my luck is and I suspect yours is going to be in this case is that it never was the pump, just sucking too much air from somewhere..... Let us know how it goes
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