If you always have bubbles going to the injectors, I suspect fuel.

A few questions:
WVO?
B100?
Ever change primary or secondary fuel filters- when?
Does the primer pump make it better?

A few things to try:

Changing the fuel filters.

The primer pump.

Get it running, look at the plastic secondary fuel filter- You should see it trapping bubbles, you may see air getting sucked down.

Put supply & return in a jar of diesel (mark them first, hard lines as well) prime it and start it. Get it running well, crack lines clear injectors of air. Shut it down, put the jar ABOVE the IP and walk away for a while. If it starts good, I think your system may be losing it's prime. Might be easier to just jack the rear end.

It looks like it might be a bad lift pump or leaky lines causing you to lose prime.

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more likely to

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have an accident

two things

when you're on

at the same time.

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