Innovative Products of America's Master Relay Bypass Set, No. 9038, plugs in place of a vehicle's fuel pump (or any other) relay providing direct control over the fuel pump circuit. When testing fuel injection systems, the Relay Bypass allows actuation of the fuel pump when the engine is not running. The six-piece set combines the No. 9036 (Relay Bypass Set) and No. 9037 (Relay Bypass Set II) into one convenient master kit, providing coverage of the most popular relay styles. Covers most Domestic, Japanese, Korean and German applications.