P0093 — Fuel System Leak Detected - Large Leak
Seen on: Cummins ISX · Detroit DD15
Fuel System Leak Detected - Large Leak. Common causes: Fuel leak at rail, injector cup O-rings, return line.
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How serious is it?
Critical. Stop as soon as it's safe.
Most likely causes
- Fuel leak at rail
- injector cup O-rings
- return line
- Cracked fuel rail
- injector body crack
FAQ
Fuel System Leak Detected - Large Leak. Common causes: Fuel leak at rail, injector cup O-rings, return line.
Critical — Stop as soon as it's safe.
The most common cause is: Fuel leak at rail. Other possibilities include injector cup O-rings; return line; Cracked fuel rail; injector body crack.
Stop as soon as it's safe. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Find a mechanic or related guides
General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.