Probably is! Got the same leak and thought replacing the unit itself would fix it. But no, it seems to be coming form the connector the OP unit is screwed into. This connector is screwed into the block which I think is where my leak is coming from. A pain in the butt to get to with the firewall just inches away!
Mark Chapman DP member #653;
1983 K2500 6.2 Suburban, 4" lift, 35" tires, ATS turbo, Banks exhaust/intake, pyrometer, tachometer;
1986 K5 6.2 Blazer, 2" lift, 33" tires, Banks intake, pyrometer, tachometer
1963 wife, one owner, average mileage for the age but in excellent shape, a keeper
1992 daughter, low mileage, pretty, limited edition, but requires some money to maintain
1995 son, sports model, very fast & peppy, time will tell on durability and maintenance costs
"Grease is good"