Hyundai Sonata 1991 Shop Manual page 258

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MPI SYSTEM
1.
Disconnect the vapour hoses. and then remove the overfill
limiter.
1.
Remove the fuel tank cap to lower the fuel tank's internal
pressure.
2.
Disconnect the harness connector from the fuel gauge unit.
3.
Remove the fuel gauge unit installation screws. then remove
the fuel gauge unit from the fuel tank.
Overfill limiter (Two-way Valve) Replacement
Fuel Gauge Unit Replacement
Y31DOQA
Y310POA
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~j/
31Y045
Fuel Pump Operation Check
Y31DQOA
1. Turn the ignition switch to OFF.
2.
Apply battery voltage to the fuel pump drive connector to
check that the pump operates.
NOTE
The fuel pump is in-tank type and its operating sound is
hard to hear without removing the fuel tank cap.
3.
Pinch the fuel hose to check that fuel pressure is felt.
31-33

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