Quote:
Originally Posted by Mermoz
c) - Now on the software part, start Techstream, plug the cable in OBD port and put ignition ON (DO NOT start engine). When ignition is ON, the fuel pump will run during few seconds only, so a small amount of gasoline will flow in the container via the hose you just installed.The goal of the procedure is to take control of the fuel pump with techstream, to turn the pump ON and pump out all the gas from the tank into the container. Easy.
h) - Start the fuel pump by clicking on the appropriate arrow, the fuel will flow down into your container. The pressure is not so high so that it is safe (watch out for leakage anyway) and the flow is quite decent so that you will empty the tank quickly. The flow will decrease as the amount of fuel is minimum in the tank. Let the pump run until no fuel at all is flowing from the hose. Then simply turn of the fuel pump clicking on the second arrow. DONE.
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I just drained the fuel by running the car in accessories position with a fuel line attached to the feed. The pump ran, and the fuel eventually stopped after pulling 4.5 gallons out. I assumed the tank was empty, but it was not. I could only fill up 9-9.5 gallons of gas. There is probably 3-4 gallons left in the car. I am assuming the fuel is on the passenger side of the tank. My guess is the siphon didn't work to bring fuel over to the other side.
For disclosure: I have a K24 swap (shouldn't matter); I have eliminated the Fuel Pump ECU (shouldn't matter); I have eliminated one of the fuel lines (shouldn't matter); I shortened the purge line, which is now vented to atmosphere (shouldn't matter); the car was somewhere around half a tank; the car was sitting for 6 months.
You say the fuel pump will only run for a few seconds. I'm guessing this is because the Fuel Pump ECU determines the fuel pump only needs to run for a few seconds to build pressure because the car is not started. I believe the Fuel Pump ECU steps up voltage depending on the algorithm. In my case, the fuel pump just ran constantly up to the moment when fuel stopped flowing after ten minutes or so and 4-5 gallons later, and then I shut things down. When I filled up and put the accessories on, I heard the fuel pump kick on, and it was loud, and I heard fuel flowing, but then I assumed the pump continued to build pressure until the regulator told the fuel pump to stop flowing or to slow down to maintain pressure. I don't know.
The question is why didn't the fuel pump drain the tank entirely? Does the passenger side get pulled via the fuel pump, or does the right side fill the left side using some type of Venturi effect or something?