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+ you have an extra injector pump :)

Excellent. Knew air was the issue here Don't forget to remove any clear line you installed while troubleshooting soon, from what my auto parts place said, not so sure it's resistant to diesel. Great feeling isn't it?

You'll get it narrowed down. If you are getting airs after bypassing the filter and having a clear line seeing them at the bypass, then it's somewhere in between the filter and where the line draws from the tank. Keep it up, you'll find it.

Don't forget some tubing and new clamps to put them together if you have to.

Next step I'd take if you still are getting air, is remove the line into the filter and out of the filter and connect them with a piece of clear tubing between them to rule out the filter canister all together and it would indicate the air is coming somewhere before the filter. And back track...

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...