Alliance/Racor
The only maintenance necessary on an Alliance or Racor fuel/water separator is to replace the filter element.
- Drain off some fuel by loosening the vent plug and opening the drain valve.
- Disconnect the water sensor and heater connections if equipped.
- Remove the element and bowl together, by turning counterclockwise.
- Remove the bowl from the element and clean the O-ring land.
- Apply a coating of clean fuel or motor oil to the new O-ring and element seal.
- Spin the bowl onto the new element, then spin them both onto the filter head, snugly, by hand only.
- Connect the water sensor and heater connectors if equipped.
- If equipped with a primer pump, prime the fuel/water separator
as follows.
- Loosen the vent plug. Then operate the primer pump until the fuel purges at the vent plug. See Fig..
- Close the vent plug.
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Mounting Head
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Fuel Primer Pump
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Vent Plug
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Bowl O-Ring
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Bowl Gasket
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Bowl Probe Plug
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Water Sensor Probe
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Heater Connector
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Drain Plug
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Sight Bowl
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Filter Element
Fig. 1, Alliance Fuel/Water Separator
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- Start the engine and check for fuel leaks.
- Shut down the engine and correct any fuel leaks.
Warning: Fluid circulated through the fuel/water separator to heat the fuel may be diesel fuel returned from the engine, or engine coolant. Drain the fuel/water separator only when the engine and fluids have cooled. Draining it when the engine is hot could cause severe personal injury due to scalding.
If returning fuel is released into the atmosphere, its vapors can ignite in the presence of any ignition source. Do not expose the fuel to, or work with the fuel system near, open flame or intense heat. To do so could cause fire, possibly resulting in serious personal injury or property damage.
Important: Do not use tools to tighten the bowl and element.