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Most vehicles that have a power release, also have a manual release. Check inside the vehicle, around the location of the outside filler door. You might have a removable panel, that will reveal the fuel door release cable.
My daughter has an 02 Optima would not take fuel unless it was down to 1/4 tank due to back pressure (similar to being full). Ran several hours of
troubleshooting including removing and checking the cannister, which was fine. I
finally found a 1-way check valve that was installed backwards (at the factory).
As soon as I disconnected the valve, the pressure instantly released. We
reversed it and the car took fuel normally. The valve has the flow arrow molded
on it. It should point toward the fill cap, not to the tank. The valve is located behind a panel in the wheel well, near the filler. Small plastic with a blue and black end (at least on my model). Hope this works!
do you mean the heater isnt giving hot air or the blower motor doesnt work if you have no heat check prestone level in rad possible thermostat not working rad cap leaking pressure inside car vent not closing or opening is this a fully electric heater control or manual type with cables what i mean do you push a button forr heat or turn a knob on the heater if it is a knob its manual type and the cables run to your feet on the passenger side sometimes they pop out and the control stays at the last position or if push button type electric the heater control burns you have to take the control off to see if not burnt but for know check the traps are closing and opening
Two things come to mind. You broke the pressure seal to the fuel system when you took off the gas cap. The fresh gas rushing in disturbs any dirt or debris on the bottom of the tank.
Next time you use the car when you arrive at our destination, simulate what you do when you fuel up. This will mimic everythig except the new fuel rushing in. If it is still hard to start you know it's something to do with the evaporative fuel system. If not, you need the fuel tank inspected .
I called the dealer and the dealer said it does not have an in-line fuel filter, but there is one the fuel tank (actually, it is a fuel pump strainer part#FS233 for $10.oo).
Put the rear seats down and open the trunk for ventilation and open the gas cap for gasoline pressure release.
The fuel pump cover is right behind the rear car seats in the trunk.
Be very careful when messing with gasoline. I will be replacing the strainer this weekend, but I plan to siphon out the gasoline before I do (I just feel safer with the tank empty)
semms to be like some of the vapor lines coming from thank to engine might be flooding your engine,
but also locate the fuel pressure regulator at the engine compartment and unplud the vacium hose, if you see any fuel coming out from fuel pressure regulator, or if the vacium hose smeel like fuel, then the regulator is not good.