Can you clarify the issue a bit more? What happens if you fill up the tank? Does it consume the amount of gallons that you refueld with...or does it only consume some of it...leaving you with a partially unused tank of gas...which would indicate that the jet is not sucking from the left side (as you presumed). But if the total amount of fuel you put in is being consumed...but the fuel gauge isn't correct...then the issue may just be a faulty fuel level sensor.
The left/right fuel level sensors inside the tank read from left to right. The left side of the tank is sucked over to the right side of the tank (the left/right perspective is from the driver's position behind the steering wheel).
If you have a full tank of gas...and you run OBC TEST 6...what does it reveal? Does the left side indicate "full" then the right side starts decreasing until the tank is empty?
If so, then the sucking jet is doing its' thing and the issue is probably the left fuel level sensor. Even though the fuel tank is bifurcated (2 sections) and there's a sucking jet that pulls the fuel over from the left side...that doesn't really occur until the fuel drops below the "hump" that separates the left right side. Even though the left fuel level sensor is supposed to go from full to zero...then the right sensor goes from full to zero...the fuel in the tank empties from top to bottom (until the fuel is actually separated by the hump in the middle and is sucked over to the fuel pickup on the right side.
What does the 2nd screen of TEST 6 reveal? Does it say
Phase 1, 2 or 3?
(left side goes down to zero 1st..then right side...image below shows that fuel gauge showing approx 1/2 tank of gas is correct in that the left sensor is showing
2.8 liters...while the right sensor is showing
35.2 liters...while the 3rd nbr represents the approx total amount of fuel left in the tank
38.1 liters)
(perfectly working fuel level sensors will say PHASE 1 in the 2nd screen of TEST 6)
See explanation of TEST 6 and what the 2 screens information means:
