What is the fuel pressure on 98 Chevy blazer with key on?
A 1998 Chevy Blazer's fuel pressure with the key ON (but engine OFF) should be between 35 and 45 PSI. This is a general range, and you should always consult your vehicle's repair manual for the exact specifications. Variations are possible depending on the specific engine (4.3L, etc.) and whether any fuel pressure regulator modifications have been made.