Fuel Lift Pump
- Fuel lift pump is located on left rear side of engine. See Figure . To check lift pump vacuum, disconnect fuel supply line at fuel lift pump. Install vacuum gauge on a fitting between fuel supply line and fuel lift pump.
- Operate engine at approximately 1500 RPM for 30 seconds, and note vacuum reading. If vacuum reading exceeds 3.75 in. Hg, check for restriction in fuel/water separator filter or fuel supply line.CAUTION: Defective fuel lift pump can create low engine power and long cranking periods. Hand lever must be in upward position to provide proper engine operation.
- Check fuel lift pump output pressure and volume at cranking speed. Replace fuel lift pump if not within specification. See FUEL LIFT PUMP SPECIFICATIONS table.
FUEL LIFT PUMP SPECIFICATIONS
| Application | Output |
|---|---|
| Pump Pressure | 3 psi Minimum (.2 kg/cm2 ) |
| Volume Within 30 Seconds | .7 Qts. (.6L) |