Description
One-way fuel return-line check valve for Detroit Diesel Series 60 (11.1L, 12.7L, 14.0L) engines, replacing Detroit OEM 23516919, 23509140, and 23516916. The valve holds fuel in the cylinder head when the engine is shut off so the next start lights off in two cranks instead of twenty. PAI Industries machines this part to OEM print and backs it with their 2-year unlimited-mileage warranty.
Signs You Need a New Fuel Check Valve
- Hard starting or extended cranking after the truck sits overnight
- Engine misfires or runs rough for the first minute, then smooths out
- Fuel filter bowl drops level when the engine is shut off
- Loss of fuel prime requiring multiple cranking cycles to start
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | 645051 |
| Part Type | Fuel Return-Line Check Valve |
| Engine Compatibility | Detroit Diesel Series 60 (11.1L, 12.7L, 14.0L) |
| Inlet Connection | 3/8 in Female Pipe Thread |
| Outlet Connection | 3/4-16 (8 SAE) Male Thread |
| Inner Diameter | 0.200 in |
| Hex Size | 0.87 in |
| Overall Length | 2.40 in |
| Warranty | 2-Year Unlimited Mileage (PAI) |
Cross References
This part replaces or is equivalent to the following part numbers:
- Detroit Diesel: 23516919, 23509140, 23516916
- PAI: 645051
Applications
This fuel check valve fits the following engines:
- Detroit Diesel Series 60 11.1L (1987–1995)
- Detroit Diesel Series 60 12.7L (1991–2007)
- Detroit Diesel Series 60 14.0L (2001–2007)
Representative vehicles using these engines:
- Freightliner Century Class, Columbia, Coronado, FLD
- Peterbilt 379, 386, 387, 389
- Kenworth T600, T660, T800, W900
- International 9200, 9400, 9900
- Western Star 4900
- Prevost, MCI, and other motorcoach applications
For the companion check valve, see PAI 645052 (replaces Detroit 23516918).
Multiple fuel pump configurations are used on Series 60 engines. Verify the part number etched on your existing valve or confirm fitment by VIN before ordering.
