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You can pressurize the fuel tank to 5 psi and open the bleeder nut on the back side of the injection pump. It's closer to the radiator and 10mm. Be gentle with it when tightening it. Push fluid until it stops bubbling.

It sounds like you have an A2 truck. Replace the soft fuel line between the primary fuel filter and the lift pump. If that doesn't solve it then inspect the lift pump (could have failed push button), bad fuel lines near tank selector valve (if tractor, dump, or wrecker), or in tank hard lines...