Sylvie Willis
A fuel pump pulse line is a component of a fuel pulse pump, which delivers fuel to an engine in a continuous and fixed stream. The pulse line is routed in a manner that keeps the line below the fuel pump. The pump is mounted low, just above the motor plate, and can be moved higher on the engine to improve its function.
| Characteristics | Values |
|---|---|
| Function | Delivers fuel continuously and in fixed proportions to the engine |
| Number of tubes | Four |
| Tube connections | One to the fuel tank, two to each carburetor, and one to the crankcase of the engine |
| Tube function | Delivers fuel with a pulse of pressure at each revolution |
| Location | Mounted low just above the motor plate |
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What You'll Learn
The pulse line should be routed below the fuel pump
If the vent on the Briggs fuel pump is sealed to prevent crankcase oil from spewing out, it is imperative that the pulse line is routed in a manner that keeps the line below the fuel pump. This is because the pump runs until the pulse line and diaphragm fill with engine oil and then stops working.
If the pulse line is not routed below the fuel pump, it can fill up with oil or condensation, causing the engine to starve of fuel and die. This is a common problem with pumps that are mounted low just above the motor plate.
To solve this issue, the pump can be moved higher on the engine. For example, on an animal, it is easy to mount it on the top plate.
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The pulse line connects the fuel tank to the engine
The pulse line is routed in a manner that keeps the line below the fuel pump. If the pump is mounted too low, it can fill with engine oil and stop working. The solution is to move the pump higher on the engine.
The pulse line goes to a fitting on the back side of the crankcase, usually just below the Mag side jug.
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The pump can be mounted on the top plate
The pulse line is the line coming from the fuel pump. It has four tubes connected to it. One tube connects the fuel tank, two tubes connect each carburettor and one tube connects the crankcase of the engine. When the engine revolves, the tube connecting the engine delivers fuel with a pulse of pressure at each revolution.
The function of a well-maintained fuel pulse pump is to deliver fuel continuously and in fixed proportions to the engine. With the use of pulses, a pre-defined quantity of fuel is delivered to the engine in a steady stream.
If the vent on the fuel pump is sealed to prevent crankcase oil from spewing out, it is imperative that the pulse line is routed in a manner that keeps the line below the fuel pump.
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The pulse line fills with engine oil
A fuel pump pulse line is a line coming from the fuel pump. It is connected to the crankcase of the engine. The pulse line fills with engine oil. If the pulse line fills with engine oil, the pump will stop working. To prevent this, the pump should be mounted higher on the engine. If the pump is mounted too low, it will fill with oil or condensation and stop pumping, causing the engine to starve of fuel and die. To prevent crankcase oil from spewing out, the vent on the Briggs fuel pump should be sealed.
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The engine needs a continuous and fixed supply of fuel
For an engine to work correctly, it needs a continuous and fixed supply of fuel. This is the function of a well-maintained fuel pulse pump. A pulse fuel pump has four tubes connected to it: one tube connects the fuel tank, two tubes connect each carburettor, and one tube connects the crankcase of the engine. When the engine revolves, the tube connecting the engine delivers fuel with a pulse of pressure at each revolution.
The pulse line is routed in a manner that keeps the line below the fuel pump. If the pump is mounted too low, it can fill with oil or condensation, causing the engine to starve of fuel and die. To prevent this, the pump can be moved higher on the engine.
On an open Animal, the pulse line is in the intake manifold. The fitting for the pulse line is tapped into the top of the block. On a Ski-Doo snowmobile, the line goes to a fitting on the back side of the crankcase, usually just below the Mag side jug.
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Frequently asked questions
A fuel pump pulse line is a line that connects the fuel pump to the engine.
A fuel pump pulse line delivers fuel with a pulse of pressure at each revolution of the engine.
If a fuel pump pulse line fills with oil, the pump will stop working. To fix this, the pump should be moved higher on the engine.
