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Home >> Isuzu >> 1986 >> Trooper II LS, 2.3 L >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Evaporation System >> Component Testing >> Check & Relief Valve
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Check & Relief Valve

  1. On 1.9L engine, remove check and relief valve and blow air into valve's fuel tank port. Check that air flows out of canister port and not out air filter port. See Fig 1 .
  2. Blow air into canister port and check that air flow is blocked. Blow air into air filter port and check that air flows out of fuel tank port and not out of canister port. Replace valve if it does not operate as outlined.
  3. On 2.3L engine, remove check and relief valve and blow into valve. Air should pass from fuel tank port to canister port only. If not, replace valve.
Fig 1: Testing Check & Relief Valve (P'UP & Trooper II) Check and relief valve for 2.3L engine has only 2 ports.
G38537
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