Ok everyone my names jason and I own a 95 chevy blazer with a 4.3 fuel injected motor. I have a problem starting my truck. When I turn the key over I can hear the fuel pump whine but when I start the truck the relays in my passenger side glove compartment click. I have replaced them thinking that they were bad but when I put the new ones in it still did the same thing. I have changed cap and rotar replaced both map sensor and computer. And still no luck. Can anyone shed some light. I have a chiltons book but no such luck. Help please

 

Given the fuel supply problems that plague so many CPI engines, I would start with a fuel pressure test. The fuel pressure test port is located on the fuel supply line where it goes through the lower intake manifold into the inner plenum. It is between the distributor and the brake booster on the back of the intake manifold.

Your engine requires >55psi to properly run. A fuel pressure gauge is necessary to read the fuel pressure.