Please fill out the following to ask a question. MAKE:GMC MODEL:Suburban YEAR:1990 MILES:100,000 + ENGINE:5.7 DESCRIBE ISSUE....Fuel Pump Installed 3 Pump in three years. Vehicle sits for long periods without being started. Checked voltage at wire harness connector near fuel tank only receiving about 5.6 volt when ignition is turned on. installed new relay on fire wall and new 10 amp fuse for ECM. Fuse was blown when checking current at relay harness.