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Fuel hose has at least three layers, these can delaminate without outward appearance of damage. The inner, most fuel resistant layer can collapse, causing such symptoms as seen. Fatty acid methyl ester (FAME, euphemistically called biodiesel) will attack aging rubber, causing this problem...

Sounds like partial vacuum in the tank. The lift pump provides a pressure of around 5 PSI gauge referenced to atmospheric pressure by spring force on a Viton-fabric diaphragm about 3 inches in diameter. That is an area of 7 square inches, the spring force is about 35 pounds. There is also...