The diesel systems are triggered by engine load (vacumn) and release the lp into the manifold thru a metered orifice. A dual-fuel (bi-fuel) engine uses a mixer (air valve) that mixers fuel and air outside of the manifold and are connected usally by the oem air cleaner tubing. By not using a mixer to control the fuel you will run way to rich probaly backfire, stall and create some very pretty blue flames