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Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 2058
Experience:  Owner at DJ Wilson
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Can u give me diagram of fuel cicle system: begining from

Customer Question

can u give me diagram of fuel cicle system: begining from tanks and end to tank, where i would see all parts and hoses etc
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Customer: replied 1 year ago.
i wanna better understand how fuel system works
Expert:  Andy replied 1 year ago.

Hi there ! My name is Andy ! I need to know what truck and engine you are tlking about

Customer: replied 1 year ago.
just a few minutes ago spoke with you about fuel system shutoff valve
Customer: replied 1 year ago.
volvo isx cummins
Expert:  Andy replied 1 year ago.


Expert:  Andy replied 1 year ago.

System Operation

  • Fuel is drawn from the tank through a fuel filter by a gear pump (supply pump)
  • The supply pump pressure is regulated at 1689 to 2220 kPa [245 to 322 psi] at 2100 RPM
  • Fuel passes through a pressure side filter (10 microns).
  • Fuel goes to the engine and the aftertreatment system.

Fuel For the Engine

  • Fuel passes through a rapid restart-style fuel shutoff valve
  • Fuel enters a passage feeding the front and rear banks, connecting directly to the fuel actuator.
  • Within a given bank, the fuel and timing actuators are commanded by the ECM to open
  • The opening of each actuator sends a pressure pulse to each injector within the bank
  • The timing of these events is tied to engine position
  • Due to the firing order (1-5-3-6-2-4) and cam position, only one injector within the bank receives fuel.

Fuel For the Aftertreatment System

  • Fuel flows down to the aftertreatment shutoff valve
  • When the valve opens, the fuel passes the aftertreatment fuel pressure sensor
  • Fuel then flows around the back of the engine to the aftertreatment fuel injector
  • When the aftertreatment fuel injector opens, fuel is sprayed into the exhaust stream
  • When the fuel is not flowing to the aftertreatment fuel injector, remaining fuel in the line between the first aftertreatment shutoff valve and aftertreatment fuel injector is sent through the second aftertreatment shutoff valve to drain.

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