Cummins pt fuel pump

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Consequently, the fuel pump rotates at engine speed. Due to this relationship, additional governing of fuel flow is required in the fuel pump. A mechanical centrifugal governor controls the fuel pressure and engine torque throughout the entire operating range. The throttle shaft is fundamentally a shaft with a hole; therefore, the alignment of this hole with the fuel passages determines the pressure at the injectors.

A sole low-pressure fuel line serves all injectors; therefore, the amount of metered fuel and pressure to all cylinders are the same. The fuel pump commonly used in the Cummins PT Fuel System incorporates a governor and an air-fuel control attachment. The air-fuel control AFC is an exhaust smoke control device that is primarily used during acceleration and is incorporated internally in the pump body. The AFC unit is intended to limit fuel flow in direct relationship to the air intake manifold pressure when the engine accelerates, is under load, and during lug-down conditions, thus reducing the amount of black smoke.

Within the pump body, a fuel pump bypass button of varying sizes is fitted to influeance the maximum fuel supply pressure of the gear-type pump before it opens and bypasses fuel back to the inlet side of the pump. The effects of changing the button size on the supply pressure are visible in the chart. Consequently, it is relatively easy to alter the horsepower setting of the engine. The primary functions of the PT fuel pump construction are as follows:. The principal fuel flow into and through the PT pump assembly will vary slightly depending on the actual model.

A simplified fuel flow is as follows; Fuel is drawn from the diesel tank by the integral PT gear pump through the fuel supply line into the primary filter when the engine cranks.

This filter is typically a filter and water separator. Fuel flows from the fuel filter through a small filter screen located in the PT pump housing and then down into the internal governor casing.

The position of the governor plunger regulates the fuel flow through various governor plunger ports. Likewise, the mechanically operated throttle location determines the amount of fuel that can flow through the throttle shaft.

Finally, fuel from the throttle shaft gets directed to the AFC needle valve. The AFC plunger position is influenced by turbocharger boost pressure at the intake manifold, which is conveyed through the air passage from the intake manifold to the AFC unit. At engine start-up, boost pressure is especially low; therefore, flow is somewhat limited. Nevertheless, fuel under pressure flows through the electric solenoid valve, which is energised by power from the ignition switch.

This fuel then travels through the fuel rail pressure line and into the injectors. A unique PT injector is provided at each engine cylinder to spray the fuel mist into the combustion chambers.

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Home More. My Account. Webasto Webasto Heaters Webasto Parts. Cummins Fuel Pump Out of Stock -. Notify me when this item is available. Most parts ship within 1 - 3 business days. Add to your wish list. Shipment Length: Shipment Height: 7. Shipment Width: 7. Shipment Weight: Warranty Warranty for Cummins New and Recon parts purchased on shop. Exceptions apply. See complete warranty information for all products sold on shop.

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The system comprises different features, including fuel connectors, injectors, PT fuel pumps, etc. The Cummins PT fuel system at a glance. PT stands for pressure-time, a type of system introduced by the company in In a nutshell, what the PT fuel system does is replace the fuel injection by modifying the way fuel pumps deliver pressure and also the time it takes.

The PT system requires the injectors to meter and inject the fuel into the cylinder with metering. The interval is determined and managed by the engine speed, which in turn determines the frequency at which the camshaft rotates and, in turn, the injector plunger movement. Like other Cummins engines, the camshaft is propelled from the crankshaft gear at a slower rate compared to the engine speed — one-half, to be precise — thereby making the fuel pump rotate at the same speed as the engine.

This helps to prevent the engine from overworking itself while operating at the high-speed range. Furthermore, the throttle shaft helps to control the pressure at the injectors by aligning with the fuel passages. Because the low-pressure fuel line works for all injectors, there is no difference in the quantity of fuel and pressure supplied to all cylinders.

This fuel-metering option is beneficial because the injector performs all metering and injection functions while the low-pressure fuel lines strike out the need for high-pressure lines to serve fuel to each injector from the fuel pump.

How the Cummins PT fuel pump works. The fuel pump is an integration of the governor and air-fuel controller. The air-fuel controller is also known as a combustion controller.

Its primary function is to determine the amount of fuel and air mixture that should be delivered to the burner at a rate that satisfies the firing rate. The air-fuel controller AFC is an integral part of the fuel pump as it is designed to control the supply of fuel based on air intake manifold pressure — anytime the engine accelerates, is under load, and during lug-down conditions.

This helps to minimize the release of black smoke. Moving on to the details of the pump body, it comes with a bypass button on its inside to gauge the highest amount of fuel supply pressure before it opens and bypasses fuel back to the inlet side of the pump.

Because the bypass buttons exist in different sizes, it is possible to adjust the horsepower setting of the engine when necessary. The PT fuel pump has this unique construction because of the functions it was designed to perform, including:.