maybe someone can help me with this troubleshooting code p0138 p0172 on my 95 blazer 4x4 and how can I fix

 

going on a limb here, rich on bank 1. the 95 is a older style cpi engine with the problematic fuel system. 2 things happen, fuel pressure regulator leaks or the nylon fuel lines in the intake to the injector "nut kit" leak.

Seeing rich bank 1 from both sensors and the nut kit is on bank one side i'd say it is leaking raw fuel into the engine. Have a fuel pressure and leakdown test done or simply remove the upper intake and look for evidence of fuel washing, clean=fuel leaking(bad) black and sooty=good

 

thanks the helps am gonna have to do that right now, a nut kit how much does go for and is there a specific brand I should go fr 2 prevent this problem again