Abstract: The invention is directed to a fuel delivery valving and hosing system comprising a fuel source coupled to a regulator, a regulator coupled to a hose; a hose coupled to an automatic shut off valve, a hose coupled to a manual shut off valve, a hose coupled to T-junction, a hose from the T-junction coupled to a low RPM valve, a hose from the low RPM valve coupled to a second T-junction, the second T-junction coupled to a preset high RPM run valve and a hose from second T-junction coupled back to a high RPM run valve and to complete a loop. A hose from the preset high RPM flow-limiting valve goes to an injector, and the injector is coupled to an engine/power plant at the carburetor, carburetor insulator or manifold. The present invention will be highly efficient at regulating and controlling gaseous fuels supplied to the engine and produce cleaner emissions.