By installing a fuel pressure gauge on service port on injection rail then drive car if dies pressure should be zero normal range 36-45 psi to keep the engine running low pressure could be stuck open pressure regulator. if pressure stays then you have eliminated fuel and move on to electrical problems such as spark.
SOURCE: 1995 nissan pickup truck fuel problem
Fuel injected or carb? Make sure fuel line itself is clear. Some pumps are designed to self regulate (carb systems) some continually pump and a psi regulator sends back the excess fuel back to the tank (fuel inj systems) If the line is obstructed then pump can't deliver fuel fulltime.
If you think pump is not on consistent, try running a dedicated wire through a switch directly to the pump. If it works then you are looking for an electrical fault going to pump. Good luck.
SOURCE: 1980 VW rabbit, manual/fuel injection: I am
it starts from cold because the auto choke is on ,allowing a richer mixture ,try removing the sender unit in the tank and seeing if the connection from the pump to the outlet connection is ok or leaking causing a loss of fuel pressure
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