Welcome back:
Have you or anyone rechecked fuel pressure? And it's not too old for diagnostic codes. It just has the first system in it. It works similar, but the retrieval process is different.
You know, I have a feeling I may know what is wrong. Based on your description, something is telling me it is still a fuel related issue. Has the filter been replaced? There is even a screen type filter on the bottom of the fuel pump. Was the tank inspected when it was out to see if it was dirty inside? Since it ran good for awhile then started the same thing again, and what you are describing sounds like the engine is starved for fuel, I have a feeling the tank is dirty and has clogged something. Keep in mind, when you first start the vehicle, pressure has to build again. If there is a restriction and pressure is delayed, what you described makes sense.
I need you to check fuel pressure when the engine is cold. Here is a link that explains how in general it's done:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Here are the specifics for your vehicle. You will need a fuel pressure gauge, but most parts stores will lend you one. Explain to them that you have to place a T in the fuel line so they give you what is needed.
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RELEASING FUEL PRESSURE WITHOUT CONSULT
WARNING: Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.
See Pic 1
1. Remove fuel pump fuse.
2. Crank engine, If engine starts let it run until it stalls.
3. After engine stalls, crank it two or three times to release all fuel pressure.
4. Turn ignition switch "OFF".
5. Reinstall fuel pump fuse after servicing fuel system.
FUEL PRESSURE CHECK
CAUTION:
- When reconnecting fuel line, always use new clamps.
- Make sure that clamp screw does not contact adjacent parts.
- Use a torque driver to tighten clamps.
- Use Pressure Gauge to check fuel pressure.
- Do not perform fuel pressure check while fuel pressure regulator control system is operating; otherwise, fuel pressure gauge might indicate incorrect readings.
1. Release fuel pressure to zero.
2. Disconnect fuel hose between fuel filter and fuel tube (engine side).
3. Install pressure gauge between fuel filter and fuel tube.
4. Start engine and check for fuel leakage.
NOTE: If engine wont start and there is little or no fuel pressure do not proceed with the remaining steps. Check the fuel pump and fuel pump control circuit. See: Fuel Pump > Testing and Inspection See: Computers and Control Systems > Component Tests and General Diagnostics > Fuel Pump Control
Fuel Pressure Check Gauge Reading
See Pic 2
5. Read the indication of fuel pressure gauge.
At idling:
When fuel pressure regulator valve vacuum hose is connected.
Approximately 235 kPa (2.4 kg/cm2, 34 psi)
When fuel pressure regulator valve vacuum hose is disconnected.
Approximately 294 kPa (3.0 kg/cm2, 43 psi)
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I also attached a picture of the fuel filter (to help identify it) and the screen at the bottom of the pump. (pics 3 and 4) Pic 3 is the screen I referred to which could be getting blocked and pic 4 is the filter. If you compare pics 2 and 4, you will see where the fuel pressure gauge is attached to check pressure.
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Please let me know if you have questions or need help. Also, let me know if the filter was replaced along with the screen on the pump and your findings.
Take care,
Joe
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Tuesday, June 25th, 2019 AT 9:05 PM