where is the problem located if the truck hsa a pump soleniod circuit leak? on 1999 Dodge Dakota

problem started when i changed the cat / converter

Asked by for the 1999 Dodge Dakota
I will assume that you are talking about EVAP system pump leak. Attach smoke machine as per manufacturers direction and watch for the smoke. You will be checking the the lines closest to where the catalytic converter work was done.
1 more answer
which pump