Excellent recovery and creep-free characteristics, unsurpassed flow, tool-free adjustment, boost-reference port included as standard fitment, lightweight, and shaped as a direct bolt-on replacement.
During 1942 Weldon began producing pumps for the US Department of Defense. By the late seventies, fast boat owners requiring rugged, dependable pumps to supply fuel to multiple engines had acquired Weldon’s services. In the mid-eighties, GM’s NHRA Pro Stock program needed a more robust fuel pump and they called on Weldon. The early nineties brought about an increased demand for high pressure pumps and bypassing regulators for fuel injected race cars and street driven vehicles.
Though Weldon Racing Pumps is a separate
entity from their aircraft/aerospace division, the stringent disciplines of aircraft quality assurance were applied to the design and manufacture of the A2046. In a “pressure creep” test using 4 ports (see attachment) minimal pressure creep can be observed. When measured in one-second increments over a 15-second interval, the new Weldon regulator gains approximately 1.5 lb compared with a leading rival, which gains approximately 4 lb. The A2046 will deliver similar pressure-creep gains when using only one or two ports.
Body & valve assembly: CNC-machined from 6061 aluminum, the lower and upper chambers of the regulator body are separated by the fast-acting valve assembly. The body of the valve assembly, which contains an intricately machined stainless steel poppet valve, is produced from white Delrin® and is precision-drilled to provide fuel evenly to one, two, or all four ports without affecting flow rate.
Functioning on pressure differences between the fuel pump and the needle-and-seat valves in the carburetor bowls, the poppet valve opens as the pressure under the diaphragm decreases (allowing fuel to enter the carburetor bowls) and closes as the pressure under the diaphragm increases. To set the fuel pressure, simply run the engine at idle and open the poppet valve to the desired pressure by adjusting the knurled knob. This knob exerts pressure on the diaphragm via a spring, spring seat, and cup. To enhance the fuel flow at low fuel pressures in the carburetor bowls, a light, precisely tensioned spring is installed on the piston to act as a damper.
To minimize fluctuations and fuel disturbances within the upper chamber above the valve assembly, Weldon provides a spacious reservoir. During extreme tests, Weldon found the new valve assembly and reservoir could flow almost 7 gallons per minute at 40 PSI with little or no pressure fluctuation. Smooth, precise fuel metering means faster recovery times, less fuel-pressure creep, fewer disturbances within the fuel bowls and, therefore, less aeration. By removing much of the chaos in the fuel delivery system, the Weldon A2046 promotes better atomization when the fuel reaches the carburetor boost venturii.