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DO NOT blow compressed air into your fuel tank. The air and fuel combined create a very dangerous situation, a fire or explosion could occur from a small spark.
The fuel outlet comes out of the fuel filter housing, then to the fuel rail. The fuel pump is used in conuction with a siphon jet pump to keep the tank level equal on both sides. The fuel pressure regulator is mounted to the bottom of the filter housing.
The other lines on the tank are for EVAP emissions.
You will have to determine if the pressure loss is at the fuel pump or fuel rail. If it is at the fuel tank side, you could have a bad O-ring, line or check valve.
- Nick
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