P0087 — Fuel Rail/System Pressure Too Low
Seen on: All diesel engines
Fuel Rail/System Pressure Too Low. Common causes: Plugged fuel filter, weak lift pump, restricted fuel line.
Your code rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- Plugged fuel filter
- weak lift pump
- restricted fuel line
- Faulty HPfuel pump
- air in fuel
- kinked fuel line
FAQ
Fuel Rail/System Pressure Too Low. Common causes: Plugged fuel filter, weak lift pump, restricted fuel line.
Serious — Power derate likely — plan to stop soon.
The most common cause is: Plugged fuel filter. Other possibilities include weak lift pump; restricted fuel line; Faulty HPfuel pump; air in fuel; kinked fuel line.
Power derate likely — plan to stop soon. 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.