How does a 2 stroke fuel pump work?
In a two stroke engine the compression and intake stroke are combined and take place in the upward 180 degree movement of crankshaft. As the two-stroke’s piston rises on compression, its underside pulls a partial vacuum in the crankcase. An intake port opens, allowing air to rush into the crankcase.
How does a pulse fuel pump pump fuel?
Pulse Fuel Pumps. Pulse Fuel Pumps function by using an engine-supplied pressure differential that acts upon a flexible diaphragm to pump fuel.
How to diagnose pulse width modulated fuel pump?
Diagnosing a pulse width modulated fuel pump must be done by a live-monitoring scan tool or a digital storage oscilloscope. Using other methods will often result in a misdiagnosis and needless component replacement that does not solve your problem.
What are the limitations of a pulse pump?
A pulse fuel pump has its own limitations. One cannot estimate the fuel pressure capacity while going uphill. The fuel is likely to rise when the vehicle climbs. The amount of fuel is always limited to the pressure or pumping value of the crankcase. It is impossible to create too much pressure with a pulse pump for the carburetors float level.
Is there a trade off for PWM fuel pumps?
The trade-off for PWM fuel pumps is on the electrical side. Additional sensors and a control module are potential failure points, although the expected failure rate is much lower than fuel pumps operating at 100% duty cycle.
Where can I get a pulse line for a fuel pump?
A pulse fitting is nothing more than a brass fitting you can find in your home improvement store’s plumbing department. In the picture above the engines side cover was used as the source of the pulse to run the fuel pump. When it comes to the pulse line you have several options.
How is the pulse transferred to the fuel pump?
This pulse is transferred to the fuel pump by a pulse tube. The pulse line connects the pulse chamber. The pressure of the crankcase is pushed by the pulse through a pair on one way valves and fuel passes continuously, and in a correct measure, to power the engine.
What are the limitations of a pulse fuel pump?
A pulse fuel pump has its own limitations. One cannot estimate the fuel pressure capacity while going uphill. The fuel is likely to rise when the vehicle climbs. The amount of fuel is always limited to the pressure or pumping value of the crankcase.
Why does a pulse pump need to be higher than the engine?
This is because the engine vibrates. The vibration of the engine will affect the pulsating flow of fuel and the regulated flow of fuel enabled by the pump will be affected. The pulse line must be rigid enough to avoid becoming damp. The best way to mount the pump is to place it higher than the engine.