Description
Genuine Detroit Diesel OEM 23516918 fuel pump check valve for Series 50 and Series 60 engines (11.1L, 12.7L, 14.0L). Spring-loaded one-way valve sits between the fuel pump and the return line and holds prime in the cylinder-head fuel galleries when the engine is shut off — the part you replace when a Series 60 cranks fine warm but turns into an extended-cranking start cold. Replaces PAI 645052 and Interstate-McBee A-23516918.
Signs You Need a New Fuel Check Valve
- Hard starting or extended cranking, especially after sitting overnight
- Fuel system loses prime after engine shutdown
- Air in fuel system causing rough running or stalling
- Fuel filter bowl level drops after engine is turned off
- Engine starts fine warm but struggles when cold
Specifications
| Manufacturer | Detroit Diesel (Genuine OEM) |
|---|---|
| Part Number | 23516918 |
| Part Type | Fuel pump check valve |
| Engine Compatibility | Detroit Diesel Series 50, Series 60 (11.1L, 12.7L, 14.0L) |
| Inner Diameter | 0.200 in |
| Hex Size | 0.87 in |
| Overall Length | 2.40 in |
| Thread | 3/8 in Female x 3/4 in -16 Male Pipe |
Cross References
This part replaces or is equivalent to the following part numbers:
- Detroit Diesel: 23516918, DDE23516918
- Freightliner / DTNA: DDE23516918
- PAI Industries: 645052
- Interstate-McBee: A-23516918
Applications
This valve fits the following Detroit Diesel engines:
- Detroit Series 60 11.1L (1987–1995)
- Detroit Series 60 12.7L (1987–2007, DDEC I–V)
- Detroit Series 60 14.0L (2001–2011, DDEC IV–VI)
- Detroit Series 50 (8.5L, 1992–2003 transit/coach)
Representative vehicles using these engines:
- Freightliner FLD, Classic, Century, Columbia, Coronado, Argosy (Detroit Series 60, 1987–2011)
- Kenworth W900, T800, T600, T660, T2000 (Detroit Series 60 option, 1987–2011)
- Peterbilt 379, 378, 377, 385, 386, 387, 389 (Detroit Series 60 option, 1987–2011)
- International 9200, 9300, 9400, 9900 (Detroit Series 60 select years)
- Western Star 4900 (Detroit Series 60 option)
- Sterling A-Line, L-Line (Detroit Series 60)
- Transit / motor coaches: MCI, Prevost, Van Hool, Gillig, New Flyer (Detroit Series 50/60)
- Class A motorhomes: Monaco, Newmar, Country Coach, Newell (Detroit Series 60 chassis)
23516918 vs 23516993 — Which Do I Need?
Detroit Diesel ships two fuel check valve part numbers; they differ on the male thread:
- 23516918: 3/8 in Female x 3/4 in -16 Male Pipe (this part)
- 23516993: 3/8 in Female x 5/8 in -18 Male Pipe
Verify your existing valve or fuel-line fitting thread size before ordering. Some Series 60 installations locate the check valve in the return line near the fuel tank rather than on the back of the head — check both before deciding the valve is the cause of a no-start.
Verify your engine serial number and fuel system configuration before ordering. Use a fuel-rated thread sealant on installation; prime the system and check for leaks before cranking.
