I have a 76" 21" dodge chassis with an Onan. The data plate says it's a 5.2FK-18. Could be a "Pk". Have to read plate with a mirror. Does anyone have one of these. were they a standard unit at this time. Been on several Onan sites that sell manuals but they don't list this as a model. Mayber it's old and obselete.
Don't know what the fk stands for it should read 5.2kva whitch is a good unit most are 4.0kva you should be able to get a manual from any rv shop or they can order one for you onan is one of the best units around