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Home >> Chevrolet >> 1989 >> Forward Control 5.7 K, Automatic, 475/M40 >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Pump - Electric >> Testing >> Fuel Pump Pressure Test

Fuel Pump Pressure Test

CAUTION: Before disconnecting fuel line to connect pressure tester, fuel line pressure relief procedures must be completed.
  1. Place transmission in Park (Neutral for manual transmission) and apply parking brake. Loosen fuel filler cap to relieve tank pressure.
  2. On 2.5L Engine, disconnect 3 terminal electrical connector at fuel tank. Start engine and let run until engine dies from lack of fuel. Crank engine for 3 seconds to relieve residual pressure. Reconnect electrical connector. On all other engines, an internal constant bleed feature automatically relieves fuel system pressure when engine is off.
  3. Plug thermac vacuum port on TBI (if equipped). Disconnect flexible fuel hose and install pressure gauge. Start engine and observe fuel pressure. See FUEL PUMP PRESSURE SPECIFICATIONS . Relieve fuel pressure. Remove pressure gauge and reconnect fuel line using new "O" ring.
FUEL PUMP PRESSURE SPECIFICATIONS

Application psi (kg/cm2 )
All Models 9-13 (.63-.91)