Gear pumps are common in many diesel systems, especially on older or custom setups. These pumps are efficient and effective — until they run dry or ingest air. That’s when damage, cavitation, and accelerated wear begin.

FASS Diesel Fuel Systems prevent these issues by ensuring gear pumps stay healthy and supplied with clean, consistent fuel.

Why Gear Pumps Fail:

• Running Dry: Without sufficient fuel flow, gear pumps can spin dry, leading to overheating and internal damage.
• Vapor Lock / Air Ingestion: Air in the fuel causes cavitation — the formation and collapse of vapor bubbles that pit metal surfaces and erode internals.
• Dirty or Contaminated Fuel: Particles and water cause corrosion, scoring, and increased internal stress.
• Irregular Pressure: Fluctuations in pressure or interruptions in supply cause strain and reduce overall lifespan.
  
  

How FASS Protects Your Gear Pump:

1. Pre-Filtering at 2 Microns
   FASS units remove tiny contaminants that would otherwise wear pump gears and housing, preserving surface finish and reducing friction.
2. Air & Vapor Removal
   By separating air and vapor before fuel reaches the pump, FASS systems prevent cavitation and stabilize the fuel column for consistent flow.
3. Consistent Fuel Pressure from Lift Pump
   FASS systems provide a dedicated lift pump to give consistent, positive pressure, reducing strain on the gear pump and avoiding starvation.
4. Water Separation
   Removing free water protects internal pump surfaces from corrosion and rust damage that can weaken gear pump integrity.
5. Leak Detection & Maintenance
   Regular checks on sealing surfaces, connections, and lines help prevent air entry and minimize the risk of failure.
   
   

Results You Can Expect:

• Longer gear pump life
• Fewer failures and lower maintenance costs
• Smoother fuel delivery under load
• Better overall reliability for your diesel fuel system