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I have found that any air leak behind the AMM will cause an intermittent stall or run rough and then stop doing it for a while.
I would say, just as intermittent as the crack opens. IMHO, that broke hose sounds wonderful for it. Lean running fits this scenario. This will add to the possible overnight shut down symptoms.
As far as the hard starting after a being, off. The fuel pressure regulator has a slight edge of failure rate over the fuel pumps check valve due to the materials used in its design.
Both will cause loss of fuel line staying filled at zero rest pressure. A leaky injector is at the bottom of a most lists without a running rich problem.
I would rule out the regulator first as it easier to inspect or as far as that goes, replace it for diagnosis.
Dirt can hit the main pump check valve if the sock strainer in the tank is bad. It can cause a leak down because trash can lodge within the spring or hang under the check balls seating surface. If the spring wears out inside, it will be hard to start, almost, all the time depending on the age of the main pump. I found that out on my oldest car.
Any dirty fuel outflow from that main fuel filter is something odd. I have never seen that before. I would think the dirt would have stayed caught within the filters pores. That filter may have started to dissolve for being on there too long. For Bosch that would have to be for many years!
Was it a Bosch or aftermarket unit? Keep that in mind if you have to consider the tank sock and check valve.
I will hold out for an air leakage as fuel smell worse, even from here. (:)
Phil
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