SPN 1347 — Engine Fuel Pump Pressurizing Assembly #1
System: Fuel
The electronically controlled valve or actuator on the high-pressure pump — often called the fuel pump actuator, inlet metering valve or FCA — that sets how much fuel the pump sends to the rail.
Can I keep running it?
HIGH — limit use, diagnose now
If the computer cannot control the pump, rail pressure goes low or erratic and the engine may derate, stall or not start.
Likely causes
- Actuator coil open or shorted
- Damaged harness or corroded connector
- Valve sticking from debris, water or varnish in the fuel
- Low supply pressure forcing the valve to its limit
Checks & fixes (easiest first)
- Inspect the actuator connector and measure coil resistance
- Compare commanded actuator current with desired vs. actual rail pressure
- Check fuel supply pressure and filters before blaming the valve
- Look for debris or water in the filters — contamination may have hurt the pump too
Common FMIs with SPN 1347
- SPN 1347 FMI 3Voltage above normal or shorted high
- SPN 1347 FMI 4Voltage below normal or shorted low
- SPN 1347 FMI 5Current below normal or open circuit
- SPN 1347 FMI 6Current above normal or grounded circuit
- SPN 1347 FMI 7Mechanical system not responding or out of adjustment
Related codes
Troubleshooting guides
FAQ
What does SPN 1347 mean?
SPN 1347 is Engine Fuel Pump Pressurizing Assembly #1. The electronically controlled valve or actuator on the high-pressure pump — often called the fuel pump actuator, inlet metering valve or FCA — that sets how much fuel the pump sends to the rail.
Can I keep running with SPN 1347?
If the computer cannot control the pump, rail pressure goes low or erratic and the engine may derate, stall or not start.
What causes SPN 1347?
Actuator coil open or shorted; Damaged harness or corroded connector; Valve sticking from debris, water or varnish in the fuel; Low supply pressure forcing the valve to its limit.