Massey Ferguson 94 – ECU: Fuel Filter Pressure Below Normal

Indicates an issue with the fuel filter pressure, most commonly triggered by a restriction in fuel flow such as dirty fuel filters or thick/gelled diesel fuel in cold weather. FMI 2 specifically means 'NO SIGNAL', indicating that the Engine Control Unit is not receiving a valid electrical reading from the fuel filter pressure sensor, pointing to an electrical fault (e.g., unplugged sensor, broken wire, or internally shorted/failed sensor).

• 4700 Series
• 4707
• 4710
• 5600 Series
• 5609
• 5610
• 5611
• 5612
• 5613
• 5700 Series
• 5700S Series
• 6600 Series
• 6612
• 6613
• 6614
• 6615
• 6616
• 6700 Series
• 6700S Series
• 7600 Series
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 8600 Series
• 8650
• 8660
• 8670
• 8680
• 8690
• 8700 Series
• 8727
• 8730
• 8732
• 8735
• 8737
• 9695/9795 Rotary Combines

1. 1

   Check the fuel level to ensure the tank is not empty

2. 2

   Inspect fuel lines for any visible damage, leaks, kinks, or restrictions

3. 3

   Check the status of both primary and secondary fuel filters for clogs or dirt, and review the date of the last filter change

4. 4

   Inspect fuel quality and temperature (check for water/contaminants in the primary filter's glass cup, or fuel gelling in cold weather)

5. 5

   Inspect electrical connections, wiring, and connectors for the fuel pressure sensor and electric fuel primer pump for damage, corrosion, or loose connections

6. 6

   Check the fuse for the fuel primer pump

7. 7

   Verify the function of the fuel pressure sensor if filters and fuel are in good condition

1. 1

   Replace fuel filters

   If filters are clogged (most common cause), close the fuel tank's stop-cock and replace both the primary and secondary fuel filters located on the side of the engine. A special filter wrench (Part No. V837079717) may be required for easier removal and installation on some models like the 4700, 5700, 6700, 7700, and 8700S series. After replacing, bleed the air from the fuel system by turning the key to the 'on' position for about 15 seconds to allow the electric lift pump to prime, or operate the manual priming lever.

2. 2

   Address fuel gelling

   If operating in cold temperatures and fuel gelling is suspected, move the tractor to a warmer area to allow the fuel to thaw and treat the fuel with an appropriate anti-gel additive.

3. 3

   Repair fuel lines

   If any damaged, leaking, or restricted fuel lines were found during the diagnostic checks, repair or replace them to restore proper fuel flow.

4. 4

   Test and replace fuel pressure sensor

   If the fault code persists after replacing filters and confirming good fuel quality, use a multimeter to check for the correct voltage supply and ground at the fuel pressure sensor. Replace the sensor if it is determined to be faulty.

5. 5

   Final system check

   Clear the fault code from the control unit dashboard and run the engine. If the tractor runs smoothly and the code does not reappear, the repair was successful.