I have looked at the pump.Its a flojet 96 psi 2130 2-32 s/ n 03433541 bought from woodbridge.Two 3 stage vacs.
T he plumbing looks ok to me,the last time i used it it worked.I did have to put different jets in my wand which wood bridge sent me.
IT is a used old machine that might get some one out of trouble.
Its up for sale now at £300.
cheers steve.