Dodge Nitro. Manual - part 677

4. Manually thread the fuel pressure solenoid (3) into the fuel rail until hand tight.  

5. Position the fuel pressure solenoid electrical socket so the fuel pressure solenoid harness connector is not 

under stress. Otherwise, the connector or harness can be damaged.  

6. Counterhold the fuel rail, and tighten the fuel rail solenoid (3) as follows: 



Tighten the fuel pressure solenoid to 60 N.m (44 ft. lbs.)  



Loosen the fuel pressure solenoid 90 degrees.  



Retighten the fuel pressure solenoid to 85 N.m (62 ft. lbs.).  

7. Install fuel rail. See INSTALLATION.  

8. Connect negative battery cable.  

9. Start engine, allow to warm, turn engine off and inspect for leaks. See DIAGNOSIS AND TESTING.  

SOLENOID - FUEL QUANTITY 

DESCRIPTION 

FUEL QUANTITY SOLENOID 

Fig. 84: Identifying Fuel Supply To Fuel Rail, High Pressure Fuel Pump & Fuel Quantity Solenoid 
Courtesy of CHRYSLER LLC 

The fuel quantity solenoid is located in the back of the high pressure pump. The solenoid is pulse width 
modulated by the ECM and meters the amount of fuel that flows into the high pressure elements inside of the 
high pressure pump. The solenoid is also inactive during the first 30 seconds to allow maximum fuel pressure to 
the fuel rail during start up. See Fig. 84. 

OPERATION 

1 - FUEL SUPPLY TO FUEL RAIL
2 - HIGH PRESSURE FUEL PUMP
3 - FUEL QUANTITY SOLENOID

 

2007 Dodge Nitro R/T 

2007 ENGINE Fuel System - Nitro

  

FUEL QUANTITY SOLENOID 

The fuel quantity solenoid is a pulse width modulated valve that controls the amount of fuel sent or delayed to 
the high pressure pump elements inside of the high pressure pump. The ECM determines the fuel pressure set 
point based on engine sensor inputs. If the actual fuel rail pressure is too low, the ECM commands the solenoid 
to allow more fuel to flow to the high pressure pump. This minimizes the difference between the actual fuel rail 
pressure reading and the set point. The ECM will also operate the solenoid, delaying fuel if the fuel rail pressure 
becomes to high. 

The fuel quantity solenoid is commanded open by the ECM to allow the high pressure pump to build maximum 
pressure (1600 BAR, 23,200 PSI). See WARNING the solenoid also has fuel tank heat protection function that 
meters the exact amount of fuel to prevent excess heated fuel from returning to the fuel tank  

REMOVAL 

FUEL QUANTITY SOLENOID 

Fig. 85: Fuel Quantity Solenoid, Air Control Valve & Supply Pump 
Courtesy of CHRYSLER LLC 

1. Disconnect the negative battery cable  

2. Remove the charge air inlet hose.  

3. Disconnect the fuel quantity solenoid wiring harness connector.  

4. Remove the solenoid from the back of the high pressure pump. See Fig. 85. 

1 - EGR AIR CONTROL VALVE
2 - GEAR SUPPLY PUMP
3 - FUEL QUANTITY SOLENOID

NOTE:

Inspect the fuel quantity solenoid and high pressure pump passage for 
contamination or corrosion. If contamination or corrosion is present 

 

2007 Dodge Nitro R/T 

2007 ENGINE Fuel System - Nitro

  

5. Inspect solenoid and pump for corrosion.  

INSTALLATION 

FUEL QUANTITY SOLENOID 

Fig. 86: Fuel Quantity Solenoid, Air Control Valve & Supply Pump 
Courtesy of CHRYSLER LLC 

1. Review the high pressure fuel system warning. See WARNING.  

2. Lubricate the fuel quantity solenoid and seal with clean diesel fuel.  

3. Install the solenoid into the high pressure pump, hand tighten the fasteners. See Fig. 86.  

4. Torque the solenoid fasteners to 10.8 N.m (96 in. lbs.).  

5. Connect the wiring harness connector.  

6. Install the charge air inlet hose.  

7. Start engine, allow to warm, shut engine off and inspect for leaks.  

FUEL INJECTION - GAS 

PEDAL - ACCELERATOR 

REMOVAL 

ACCELERATOR PEDAL - WITHOUT ACCELERATOR PEDAL POSITION SENSOR 

replace the high pressure pump.

1 - EGR AIR CONTROL VALVE
2 - GEAR SUPPLY PUMP
3 - FUEL QUANTITY SOLENOID

 

2007 Dodge Nitro R/T 

2007 ENGINE Fuel System - Nitro

  

Fig. 87: Accelerator Pedal - Without Accelerator Pedal Position Sensor 
Courtesy of CHRYSLER LLC 

The accelerator pedal and APPS (Accelerator Pedal Position Sensor) are serviced as a complete assembly 
including the bracket. 

1. Disconnect electrical connector (3) at APPS.  

2. Remove two accelerator pedal mounting bracket nuts (2).  

3. Remove accelerator pedal/APPS assembly (1) from vehicle.  

INSTALLATION 

ACCELERATOR PEDAL - WITHOUT ACCELERATOR PEDAL POSITION SENSOR 

 

2007 Dodge Nitro R/T 

2007 ENGINE Fuel System - Nitro