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May, 30 2025
Fuel Pump Requirement
🔧 Fuel Supply Requirements for Diesel Fire Pumps – NFPA 20 (Section 11.4) 🔧
If you're working with diesel-driven fire pumps, understanding the fuel supply system design is critical. Here's a simplified breakdown of NFPA 20 - 11.4: Fuel Supply and Arrangement to help ensure safety, compliance, and performance:
✅ Plan Approval First
All fuel system designs must be submitted to the Authority Having Jurisdiction (AHJ) for approval before installation.
✅ Fuel Tank Use & Separation
Fuel tanks must be dedicated ONLY for fire pump engines.
Each diesel engine must have its own separate fuel tank, supply line, and return line.
✅ Tank Capacity
Minimum capacity = 1 gallon per horsepower (or 5.07 L/kW)
Add 5% for expansion and 5% for sump volume
Larger tanks? Consider fuel heating, refill cycles, etc.
✅ Tank Construction
Use UL 142-rated tanks (single or double wall)
Must be on non-combustible supports
Limit: 1320 gallons (4996 L) – Larger tanks follow NFPA 37
Single-wall tanks require a containment structure
✅ Tank Connections (Must-Haves):
1. Fill Connection (top-entry must reach 6" from bottom)
2. Drain Connection (1” NPT at lowest point)
3. Vent Connection (≥2” NPT or per UL 142 / at least as large as fill)
4. Engine Supply Connection (from tank side, leaving 5% sump)
5. Return Line Connection (same size as return pipe)
6. Fuel Level Switch Port (2” NPT near center top)
7. Active Fuel Maintenance Return Port (1” NPT top port, plug if unused)
8. Double-Wall Tank Monitoring – Interstitial space must be monitored and supervisory alarm provided via controller
📌 These guidelines ensure diesel fire pumps are fueled safely and efficiently, especially during emergencies.
🔍 Always refer to the latest NFPA 20 and consult your AHJ for project-specific requirements.
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