Overview

Waterman Racing Adjustable EFI Fuel Pressure Regulators

Waterman Racing adjustable EFI and fuel pressure regulators are high-flow, billet-aluminum pressure-control devices built for medium- to high-horsepower race and performance engines.

Core overview:

* Function: Manages fuel delivery pressure and maintains a stable or rising fuel curve relative to engine demand or manifold pressure
* Material: CNC-machined 6061-T6 billet aluminum with anodized finishes
* Fuel compatibility: Gasoline, E85, alcohol/methanol, and diesel (depending on the specific model)
* Used in demanding motorsports (Circle Track, Sprint cars, drag racing, forced induction/boosted EFI setups)
* Compliance: Most race-series regulators are restricted to non-emissions-controlled or closed-competition racing vehicles

Key features and types:

* Standard / rising-rate EFI regulators:
-- Base pressure typically adjustable from 35-75 psi (some units go up to 120 psi with optional springs)
-- 1:1 vacuum/boost reference capability so fuel pressure rises pound-for-pound with manifold boost
-- High-flow capacity (handling 150+ gph) with ORB-06, ORB-08, or AN-10/AN-12 ports
* Double/dual-adjustable variants:
-- Dual independent pressure adjustments (one for idle, one for wide-open throttle/WOT)
-- Engineered for variable-volume mechanical/belt or continuous-flow systems tied to engine RPM

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