Question about Dodge Dakota

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I have a 1995 Dodge Dakota. my problem seems to be with the fuel pump, or presure reg. As long as I keep at least 1/2 tank of fuel, it runs fine. But the more below 1/2 tank the more it starts to act like it's running out of fuel. I now have the pump out, and was looking for a view of the assy. I am wondering about a hose comming out 0f the top part of the actual filter. it only runs up about 5in.. That seems to be about 1/2 tank. do you suppose it is sucking air? If not what do you suggest?

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Make sure you are with the tank half full, could be an error in the signal indicator of fuel, which would indicate a half tank when it might be less (or empty), with the option that the air entering system.

I have a 1995 Dodge - d864812.jpg

Fig. : Common components of the Dakota fuel tank system


Fig. : Fuel pump module lines when removing the tank

Keep in mind this information about the fuel injection system, so this is under a constant pressure. Before servicing any part of the fuel injection system, the system pressure must be released. Use a clean shop towel to catch any fuel spray and take precautions to avoid the risk of fire.
The MFI system uses an electric fuel pump mounted in the fuel tank. The fuel pump used in this system is a positive displacement, roller vane immersible pump with a permanent magnet electric motor.

For 1993-96 5.9L and 1994-96 3.9L/5.2L/8.0L models, as well as 1996 2.5L models with the "returnless'' fuel injection system, the fuel pump is referred to as the "fuel pump module''. For the returnless system, the fuel is drawn in through an opening tube in the bottom of a filter/regulator. The regulator portion is calibrated to maintain a fuel pressure of approximately 35-45 psi (241-310 kPa). The internal fuel filter is built into the assembly. The filter/regulator contains a diaphragm, calibrated springs and a fuel return valve. An internal check valve maintains some fuel pressure when the engine is not running to enable a satisfactory start-up. The internal diaphragm routes fuel in excess of 45 psi (310 kPa) back to the fuel tank. With this system, proper fuel pressure is controlled at the source, so there is no need for a separate return line from the engine to the tank as found in conventional fuel systems.

I suggest test following the next procedure... the fuel system test port is located on the fuel rail in the engine bay.


Fig. 1: Fuel pressure test port199296 3.9L engine

Fig. 2: Fuel pressure test port199296 5.2L engine


Fig. 3: A common fuel pressure test using a screw-ingauge rated to at least 60 psi (414 kPa)

1993-96 5.9L, 1994-96 3.9L/5.2L/8.0L and 1996 2.5L Models
see Figures 1, 2 and 3 (above)
With the engine at idle, the system fuel pressure should be within 35-45 psi (241-310 kPa).

  1. Uncap the pressure test port and screw in a fuel pressure gauge designed to read 0-60 psi (0-414 kPa), such as from set No. 5069. On the 8.0L engine, the test port is found at the front of the engine.
  2. Read the gauge. If within specifications, it will show 35-45 psi (241-310 kPa).
  3. If the pressure is 0 psi/kPa, you will need more extensive diagnosis using a DRBII or equivalent scan tool, and the appropriate Powertrain Diagnostics Procedures service manual. If the pressure is above 45 psi (310 kPa), the fuel pump is okay. Replace the fuel filter/fuel pressure regulator assembly.

Hope help with this.

Posted on May 08, 2010

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