1998 GMC Envoy Q&A
1998 GMC Envoy Question: How do you know if the problem with starting is the fuel pump or fuel filter?
check your fuel pressure if they are good and strong, then check if you have spark. - ebans777
On your 4.3L engine, the fuel pressure check valve is on the fuel rail...fuel pressure should be 56-66psi when powered up...most likely it will be a failed fuel pump because that is a common GM Truck issue. When changing fuel pump, fuel filter replacement is recommended. - your.mechanic