Cranks very well but no start unless with starter fluid

Hi,

The first thing I suggest is to check fuel pressure. If it starts with starting fluid, then we know it's a fuel related issue. Even though you hear the pump, it may not be producing.

Here is a link that explains how in general to check the pressure:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

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Here are the directions specific to your vehicle. The manufacturer's specs are included in the directions and the attached pictures correlate with the directions.

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2001 Nissan-Datsun Truck Pathfinder SE 4WD V6-3.5L (VQ35)
Component Tests and General Diagnostics
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Pump Fuel Pressure Testing and Inspection Component Tests and General Diagnostics
COMPONENT TESTS AND GENERAL DIAGNOSTICS
Fuel Pressure Check
- When reconnecting the fuel line, always use new clamps.
- Make sure that the clamp screw does not contact adjacent parts.
- Use a torque driver to tighten clamps.
- Use a Pressure Gauge to check fuel pressure.
- Do not perform fuel pressure checks with the system operating. The fuel pressure gauge may indicate false readings.
1. Release fuel pressure to zero.

pic 1

2. Disconnect fuel tube joint between fuel damper and injector tube and set fuel pressure check adapter (J44321).

pic 2

3. Install pressure gauge to the fuel pressure check adapter as shown in the figure.
4. Start engine and check for fuel leakage.
5. Read the indication of fuel pressure gauge.

At idling:
With vacuum hose connected
Approximately 235 kPa (2.4 kg/sq.cm, 34 psi)

With vacuum hose disconnected
Approximately 294 kPa (3.0 kg/sq.cm, 43 psi)

If results are unsatisfactory, perform Fuel Pressure Regulator Check.

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Let me know what you find.

Take care,
Joe

As Joe said check the pressure, I would also suggest replacing the fuel filter if you didn't already, While it is out connect a tube to the outlet of the pump side of the lines and turn on the key, do you get clean fuel? If yes, go to where the fuel pressure was tested and make sure you are getting fresh fuel there as well. Setting for that long could have allowed any alcohol in the fuel to settle out and cause corrosion in the lines that could easily plug up the injectors.