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<h2>What is a high pressure fuel pump?</h2>The high pressure fuel pump (HPFP) represents a pivotal component in direct injection gasoline engines, responsible for generating and sustaining the extremely elevated fuel pressure of approximately 2,000-3,000 psi essential for proper atomization and direct injection into the combustion chambers. This electrically powered, robust pump serves three key functions: supplying the necessary elevated pressure, regulating consistent fuel pressure for optimal performance, and delivering sufficient flow to fulfill engine demands. Proper pump operation is indispensable, as malfunctions can cause drivability issues, diminished power output, and emissions problems triggering the check engine light.<h2>High pressure fuel pump failure symptoms</h2><ul><li>Reduced power and performance: The engine may feel sluggish, lack responsiveness, and exhibit a noticeable decrease in power, especially under high loads.</li><li>Starting and idling issues: The engine may be difficult to start, crank for longer than normal, or run rough and potentially stall when idling due to the inability to maintain consistent fuel pressure.</li><li>Check engine light illumination: The engine control unit will detect the fuel pressure issues and trigger the check engine light.</li><li>Increased fuel consumption: A failing high pressure fuel pump may not be able to deliver the required fuel flow, leading to incomplete combustion and higher than normal fuel usage.</li></ul><h2>Replacement of high pressure fuel pump</h2>To begin the high pressure fuel pump replacement, the fuel system pressure must first be relieved. This involves disconnecting the battery to cut power to the fuel pump, then running the engine until it stalls to depressurize the fuel lines. Next, the necessary components must be removed to access and disconnect the pump, taking note of its orientation for proper reinstallation.With the old pump disconnected, the new replacement unit can be installed in the original orientation, reconnecting all the electrical, <a href="https://a-premium-api.com/fuel-line-kit">fuel line</a>, and mounting connections. To prime the system, the battery is reconnected to power the new pump briefly and build up pressure. Finally, the engine is started and inspected for any fuel leaks, with performance tested to ensure proper operation. Any diagnostic trouble codes set by the old faulty pump should also be cleared at this stage.<h2>A-Premium HPFP: engineered for reliable power, built to last</h2>A-Premium's high pressure fuel pump is engineered with precision and durability to provide consistent, high-performance fuel delivery for your direct-injection gasoline engine. Leveraging advanced materials and manufacturing, this reliable pump features a robust, wear-resistant design that can withstand some extreme conditions of the engine compartment. Its accurate pressure regulation and ample flow capacity support optimal engine efficiency and prevent issues like misfiring. With a 90-day free return policy, a 2-year warranty, and 24/7 customer service, we ensure your satisfaction is our top priority. Seamlessly integrated with your vehicle's systems and rigorously tested, the A-Premium pump delivers dependable, high-quality performance you can trust to elevate your driving experience.&nbsp;

High Pressure Fuel Pump

Air Cleaner

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Air Filter Box

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Air Flow Sensor

Air Intake Duct

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Air Intake Hose

Air Intake Manifold Actuator Control Solenoid

Air Intake Manifold Flap Adjuster

Air Intake Manifold Runner Control Sensor

Air Intake Resonator

Electric Vacuum Pump

Engine Air Duct Assembly

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Engine Air Filter

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Intake Manifold

Intake Manifold Flap Actuator

Intake Manifold Repair Bracket

Intake Manifold Runner Control Valve

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Intercooler

Intercooler Hose

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Oxygen Sensor

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Pressure Sensor

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Supercharger Pulley Drive Unit

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Supercharger Snout Rebuild Kit

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Throttle Body

Throttle Cable

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Throttle Position Sensor

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Turbocharger

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Turbocharger Gasket Kit

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Turbocharger Oil Line

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Vacuum Pump

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Air Filters & Intake Systems

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Camshaft Adjuster

Camshaft Adjuster Cover

Camshaft Kit

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Camshaft Timing Gear

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Camshafts

Chain Tensioner Adjuster

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Cylinder Head

Cylinder Head Assembly

Eccentric Shaft Actuator

Engine Timing Belt

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Engine Valve Cover

Engine Valve Cover Gasket

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Harmonic Balancer

Rocker Arm

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Rocker Arm Shaft Lifter Assembly

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Timing Belt Kit

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Timing Chain Gear

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Timing Chain Kit

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Timing Cover

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Timing-Control Valve Solenoid

Valve Cover Gasket

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Valve Lifter Guides

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Valve Lifters Tappet

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Cams, Timing & Valvetrain

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Belt Tensioner

Coolant Level Sensor

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Crank Installer Tool

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Crankcase Breather Hose

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Crankcase Breather Valve

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Crankshaft Position Sensor

Crankshaft Pulley

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Engine Oil Dipstick

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Engine Oil Dipstick Tube

Engine Oil Filter

Engine Oil Pan Gasket

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Flywheel

Harmonic Balancer Crankshaft Hub

Knock Sensor

Oil Baffle

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Oil Cooler

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Oil Cooler Line

Oil Drip Pan

Oil Filler Cap

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Oil Filter

Oil Filter Base

Oil Filter Cover

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Oil Filter Housing

Oil Filter Housing Cover

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Oil Level Sensor

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Oil Pan

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Oil Pump

Oil Pump Drive Gear Shaft

Oil Pump Pickup Tube

Oil Separator

Serpentine Belt

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Cranks, Pistons, Oil & Components

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Camshaft Position Sensor

Camshaft Position Sensor & Magnet Kit

Connector Plug

Distributor Cap

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Electronic Ignition System

Engine Valve Covers & Ignition Coils Kits

Glow Plug

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Glow Plug Relay Module

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Ignition Coil

Ignition Coils & Spark Plugs & Wires Kits

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Ignition Coils & Spark Plugs Kits

Ignition Coils & Wires Kits

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Ignition Distributor

Ignition Lock Cylinder

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Ignition Starter Switch

Ignition Switch Actuator

Kill Switch

Knock Detonation Sensor

Relay

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Spark Plug

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Spark Plug Wire

Electronic Control Modules, Ignition & Distributors

Engine Wiring Harness

Intake Manifold Repair Kit

Pulley

Engine Components & Accessories

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Active Grille Shutter Actuator

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Auxiliary Water Pump

Drive Motor Inverter Cooler

Electric Engine Water Pump

Engine Coolant Air Bleeder Valve

Engine Coolant Pipe

Engine Coolant Shut Off Valve

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Expansion Tank

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Expansion Tank Mounting Plate

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Fan Pulley Bracket

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Fuel Cooler

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Overflow Hose Connector

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Radiator

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Radiator Control Fan Module

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Radiator Core Support Skid Bar Plate

Radiator Fan Cooling Motor

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Radiator Hose

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Engine Cooling

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The engine comprises many essential elements such as the lower cylinder block, upper cylinder head(s), and the cooling & lubricating systems. With A-Premium aftermarket engine components, you can expect that your engine deliver years of reliable performance. We offer a diverse selection of engine components from air filters and ignition coils (kits) to fuel pumps to cater to your needs.

2012 Mercedes-Benz CLS550 High Pressure Fuel Pump

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