Description
PAI 645054 is a fuel pump check valve for Detroit Diesel Series 60 engines, replacing OEM 23537213 and 23536504. The valve maintains fuel rail pressure during shutdown to keep the system primed for next start, with a 9/16-24 inlet thread and 5/8-18 male pipe outlet sized for the Series 60 fuel pump and supply line.
Signs You Need a New Fuel Check Valve
- Hard starting or extended cranking after the engine sits
- Loss of fuel prime requiring repeat priming cycles
- Rough idle or stumble after restart
- Visible fuel weeping at the check valve fitting
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | 645054 |
| Part Type | Fuel Pump Check Valve |
| Engine Compatibility | Detroit Diesel Series 60 (12.7L, 14L) |
| Inlet Thread | 9/16-24 |
| Outlet | 5/8-18 male pipe |
| Inner Diameter | 0.20 in |
| Hex | 0.87 in |
| Overall Length | 3.54 in |
| Warranty | 2-year PAI manufacturer warranty |
Cross References
This check valve replaces or is equivalent to the following part numbers:
- Detroit Diesel: 23537213, 23536504
- Also known as: DDE23537213, DDC23537213, DDE23536504, DDC23536504 (Detroit dealer prefixes)
Applications
This fuel check valve fits the following engines:
- Detroit Diesel Series 60 12.7L (1996-2007)
- Detroit Diesel Series 60 14L (1999-2007)
Representative vehicles using these engines:
- Freightliner Classic, Century, Columbia, Coronado (1996-2007)
- Western Star 4900, 5800, 6900 (1996-2007)
- Sterling A-Line, L-Line (2000-2007)
- Mack Vision (2000-2003)
Application varies by engine year and fuel pump variant; verify your engine serial number and fuel pump configuration before ordering to confirm fitment.
