Electrical circuit diagrame for serial number engines IS THIS TRUE

"I have been told today that t

"I have been told today that there are different circuit diagrames for different seriazied engine of the same model.

Due to a short on my aq430b engine which is causeing the fuel pump to run when ignition switch is turned to acc or position and the feed seams to be comeing from the purple wire near loom when i remove it from the circuit the pump stops, according to the manual my elctric fuel pump is suposed to run when the engine is cranking or running.

In the manual it shows the very first loom version when the engine first came into the market and i have been told that i have the last version of loom (3) for my engine

I have contacted a various dealers here in good old blitty and every ones coment has been that "thats old engine to old for us to help you try another dealer.

can anyone quide me to were i might be able to locate a circuit diagrame for my engine serial number either pdf or hard copy


ENGINE DETAILS, M041 430B, 4.3LG
SERIAL NUMBER: 4100136783

any help would be realy realy appreciated

thanks mark"