.020in Bypass Pill Main Jet

The .020in Bypass Pill Main Jet by ENDERLE is a precision fuel metering component designed for high-performance carbureted engines and custom fuel systems. This bypass pill serves as a critical flow control element in fuel injection and carburetor tuning applications, particularly in drag racing, street rods, and heavily modified engines where precise fuel atomization and delivery are non-negotiable. As an experienced mechanic, you understand that carb jetting directly impacts horsepower output, throttle response, and drivability—and this ENDERLE jet represents OEM-quality engineering for builders who demand repeatability and reliability.

The .020-inch orifice diameter of this main jet precisely controls fuel flow through the main metering circuit, allowing you to dial in the optimal air-fuel ratio for your specific engine combination and intended RPM range. ENDERLE's bypass pill design incorporates a stepped or relief passage that regulates fuel pressure delivery, preventing flooding and vapor lock while maintaining consistent fuel supply under high load and acceleration. The jet's compact 1-inch form factor and minimal 0.02 lb weight make it ideal for space-constrained fuel systems, and the precision-machined brass or steel construction ensures durability even in high-temperature under-hood environments and with ethanol-blended fuels.

This component is essential for anyone tuning a vintage carburetor, installing a modern EFI conversion, or rebuilding a fuel system on a competition vehicle. The .020in size is commonly paired with mid-range displacement engines (typically 350–454 cubic inches) at cruise and part-throttle settings, making it ideal for street/strip applications that demand flexibility across load conditions. Installation requires familiarity with carburetor or fuel system architecture; verify your specific ENDERLE fuel system manual or consult with a carburetor specialist to confirm jet sizing matches your engine's displacement, boost level (if supercharged or turbocharged), and fuel delivery pressure specification before ordering.