from the air drier 78 is controlled by regulators 81 a and 81 b while air flow from the manifold compartments to breathing system 64 is controlled by regulator 81 c referring now to fig6 the air compressor vmac 28 is mounted on the upper right side of the engine 92 and is engaged and disengaged by an air compressor clutch 94 which is driven by an air compressor belt 96 the air compressor belt 96 is ultimately driven by the engine crankshaft 97 through a crankshaft drive pulley 98 and the connection between the two is secured by a pair of stabilizer pulleys 100 a and 100 b hoses 17 run from the air compressor vmac 28 to the oil air separator 74 not shown in fig6 a motor vehicle according to the invention thus provides a portable self contained foam injection system wherein the major powered components are controlled and powered by the vehicle rather than separate stand alone devices such as a gas powered electrical generator which would take up space inside of the truck box if the truck is used only for transporting the components of the foam spray system then a much larger and hence more expensive truck is needed the present invention remedies this problem while providing control systems that regulate the amount of power from the truck engine that is used to power the spray system components although several embodiments of the present invention have been described in the foregoing detailed description and illustrated in the accompanying drawings it will be understood by those skilled in the art that the invention is not limited to the embodiments disclosed but is capable of numerous rearrangements substitutions and modifications without departing from the spirit of the.