How does the fuel pump work on a Harley Davidson?
The fuel pump provides a high pressure feed to the fuel rail that contains the fuel injectors. On the fuel rail there is a pressure regulator that limits the fuel pressure to 39-45 PSI and maintains a constant pressure. The pressure regulator has a vacuum line that connects it to the intake manifold.
What kind of EFI system does a Harley Davidson use?
EFI systems that sense engine load by the use of the throttle or TPS (throttle position sensor) are referred to as an Alpha-N system. EFI systems that sense engine load by the use of a MAP sensor are referred to as a Speed-Density system. Harley-Davidson has used both types of EFI systems on its vehicles.
Why does my fuel pump whine when I Turn on the engine?
I turn the ignition and hear the pump whine. Hit the start button and it fires up. Ride it just a block or so and it dies. (engine dies but all lights etc are still on) When I switch the button to run I hear the fuel pump relay chatter and the fuel pump itself tries to whine, but never completes the full “whine cycle”.
How is the fuel pump relay and idle solenoid activated?
The idle solenoid is activated by a 12-volt signal and allows additional air into the intake manifold to increase the idle RPMs. The main relay is activated by the ignition switch and provides power to all components in the EFI system. The fuel pump relay is activated by the EFI ECU when the engine is running.
The fuel pump provides a high pressure feed to the fuel rail that contains the fuel injectors. On the fuel rail there is a pressure regulator that limits the fuel pressure to 39-45 PSI and maintains a constant pressure. The pressure regulator has a vacuum line that connects it to the intake manifold.
EFI systems that sense engine load by the use of the throttle or TPS (throttle position sensor) are referred to as an Alpha-N system. EFI systems that sense engine load by the use of a MAP sensor are referred to as a Speed-Density system. Harley-Davidson has used both types of EFI systems on its vehicles.
I turn the ignition and hear the pump whine. Hit the start button and it fires up. Ride it just a block or so and it dies. (engine dies but all lights etc are still on) When I switch the button to run I hear the fuel pump relay chatter and the fuel pump itself tries to whine, but never completes the full “whine cycle”.
The idle solenoid is activated by a 12-volt signal and allows additional air into the intake manifold to increase the idle RPMs. The main relay is activated by the ignition switch and provides power to all components in the EFI system. The fuel pump relay is activated by the EFI ECU when the engine is running.
What kind of fuel injection does a Harley Davidson use?
The Magneti-Marelli system used on EVO and Twin Cam FLH’s until 2001 and Buell XL engines is an Alpha-N EFI system. On these bikes, load sensing is determined by the throttle position. The newer Delphi EFI system used on current Twin Cam engines is a Speed Density system.
How does a fuel injection system work on a motorcycle?
EFI Basics. In its simplest terms, an electronic fuel injection (EFI) system is a computer controlled fuel delivery system. This electronic control unit (ECU) reads various sensors located on the vehicle and makes the determination of how much fuel to allow the engine to have based on this information.
How is the fuel pump controlled in a boosted system?
This is the heart and soul of a boosted mechanical system. This valve begins at wide open and is controlled by a 3lb pressure valve coming from the barrel valve – The 3 lb keeps it from flowing fuel while the fuel pump is trying to initially get fuel to the nozzles.
Which is the most difficult adjustment to make for fuel injection?
This is the most difficult adjustment to make, since you have to do some guessing about where your boost is coming in to allow the use of more fuel to the power nozzles sooner or later.
How does idle adjustment work on a butterflies?
The Idle adjustment is accomplished by what is known as leakdown%. You will need a leak-down tester for fuel injections to accomplish this, or you can simply attempt to adjust the hex rod that connects the K Valve to the Butterflies-
What happens when you put more shims in fuel injection?
More shims in it result in making it open at a higher pressure which keeps the power nozzles closed longer – Less shims = less pressure which will open them sooner – So now you have the 4 th adjustment.