New pump installed in rear tank but to my dismay Oriellys had sold me the wrong pump although it was the pump called for an after spending get 45 min in the store going over their parts no pump like mine was found so had to modify it all & use the one that they sold me. The pump was same size but outlet was configured differently. But rigged it up an is working fine. Now when key is turned on the pump in tank can be heard clearly whereas before there was just a light Humm. Anyway I will try it out today an see how it goes. Thanks Gary Haupt for all your assistance. BTW I'm still looking for the function of the push button on the left of steering column in the cab ?