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SPN 94 FMI 17

Fuel Delivery Pressure — Value too low (least severe).
The reading is below normal, but only at the lowest warning level.

What the SPN covers: Low-pressure fuel supply pressure feeding the high-pressure pump, after the lift pump and filters. More on SPN 94.

What FMI 17 usually points to: An early warning: slightly low level or pressure, or a sensor starting to drift low. More on FMI 17.

Severity

HIGH — limit use, diagnose now

Low fuel supply can cause power loss, hard starting and pump damage. Address before working the engine hard.

Likely causes

  1. Clogged fuel filter(s)
  2. Failed or weak lift/transfer pump
  3. Air leak on the suction side
  4. Low fuel level or gelled fuel in cold weather
  5. Faulty pressure sensor

Checks & fixes (easiest first)

  1. Replace fuel filters and prime the system
  2. Check for air in clear lines or a sight glass
  3. Measure supply pressure with a mechanical gauge
  4. Check tank pickup and vent

FAQ

What does SPN 94 FMI 17 mean?

Fuel Delivery Pressure — value too low (least severe). The reading is below normal, but only at the lowest warning level.

Is SPN 94 FMI 17 serious?

Low fuel supply can cause power loss, hard starting and pump damage. Address before working the engine hard.

What should I check first for SPN 94 FMI 17?

Replace fuel filters and prime the system; Check for air in clear lines or a sight glass; Measure supply pressure with a mechanical gauge.