The 4.0TT's high-pressure fuel pumps supply high-pressure fuel (exceeding 2900psi each) to the direct-injeciton fuel system injectors. When running turbo upgrades, especially with ethanol fuel blends, the stock HPFPs internal volumes become a limiting factor when increasing power. IE's HPFP internals install into your factory pump housings and increase the bore and piston size of the pump internals, allowing more flow, fuel, and horsepower & torque from your hardware and tuning upgrades.
FLOW TESTING
Flow testing was performed to measure the increase in flow rate which produced a maximum result of 38.58% gain over stock!
RELIABILITY
Every piston and cylinder is CNC machined to exacting sizes, assembled, and measured as a matching set in-house. Tolerances are hand-verified using specialized measurement tools and verified down to 0.00005 of an inch to ensure reliability and proper function.
Engineered & manufactured in the US
CONSTANT DIAMETER PIN
Many aftermarket HPFP options use a stepped-diameter piston in a cost-saving effort to reuse the already weak and problematic factory seal. A stepped design dramatically reduces the contact between the pin and cylinder, causing instability of the pin stroke leading to increased wear. IE assemblies use a constant diameter pin which maintains its larger size through the entire piston shaft. This engineering detail increases the contact between the pin and cylinder by over 50%, increasing pin stability and an even greater displacement.
LEAK-FREE SEAL
A CNC machined stainless steel pump body holds our molybdenum disulphide seal, which is ideal for reducing friction and maintaining stiffness. The seal is spring energized to increase reliability and provide constant outward pressure. The body is sealed to the pump with a quality Buna-N (acrylonitrile butadiene) rubber o ring, ensuring it will hold up against heat and a wide range of fuels. What may seem like minor features add up to ensure long life and trouble-free operation.