1997 GMC Sonoma Fuel Pump Intermittant?

Check the connector back there, they sometimes melt, or corrode, pull it apart and inspect it.

Hi well unfortuneately it is hard to grt quality parts anywhere. But yes your pump will have to be replaced again. You can buy a oem pump and it will last longer. But much more expensive. Good luck billymac

I'd say do what I said, if ok, test pressure BEFORE replacing. Also check the relay, contact may not be closing all the time.

SORRY MERLIN DID NOT SEE YOUR POST BILLYMAC

FUEL SYSTEM PRESSURE TEST 1. Perform On-Board Diagnostic (OBD) System Check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. After performing OBD system check, go to next step. 2. Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELIEF. Connect Fuel Pressure Gauge (J-34730-1A) to fuel pressure test port. Turn ignition on with engine off. Fuel pressure should be 60-66 psi (4.2-4.6 kg/cm 2 ) on CSI fuel system and 56-62 psi (4.0-4.4 kg/cm 2 ) on SFI fuel system, and should hold steady. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, go to step 9). 3. Turn ignition off for 10 seconds, then turn ignition on. Fuel pump should run for 2 seconds. Observe fuel pressure. If pressure is within specification and holds, go to step 5). If pressure is not within specification, or is within specification but does not hold, go to next step. 4. Turn ignition off for 10 seconds. Turn ignition on. Pinch off fuel pressure feed line. If pressure is as specified and holds, go to step 6). If pressure is not as specified, or is as specified but does not hold, go to step 8). 5. Warm engine to normal operating temperature. From idle, open throttle quickly. Observe fuel pressure. If fuel pressure is within specification, see the TESTS W/O CODES article. If fuel pressure is not within specification, go to step 8). 6. Check for partially disconnected fuel pulse dampener/pulsator. If dampener/pulsator is partially disconnected, go to next step. If dampener/pulsator is okay, go to step 13). 7. Repair connection at fuel pulse dampener/pulsator. After repairs, go to step 28). 8. Check fuel feed line between pinch and CSI/SFI unit. If fuel feed line is restricted or leaking, go to step 27). 9. Turn ignition off for 10 seconds. Turn ignition on. Fuel pump should operate for about 2 seconds. Observe fuel pressure after fuel pump stops. If pressure is present, go to step 14). If pressure is not present or drops, go to next step. 10. Turn ignition off. Connect a fused jumper wire between battery voltage and fuel pump test terminal. If fuel pump operates, go to next step. If fuel pump does not operate, go to FUEL SYSTEM under NO-START DIAGNOSIS. 11. Check for plugged fuel filter, plugged fuel pump strainer, restricted fuel line or disconnected fuel pulse dampener/pulsator. If a problem is found, go to next step. If a problem is not found, go to step 13). 12. Repair or replace plugged fuel filter, plugged fuel pump strainer, restricted fuel line or disconnected fuel pulse dampener/pulsator. After repairs, go to step 28). 13. Replace fuel pump. After repairs, go to step 28). 14. Turn ignition off for 10 seconds, then turn ignition on. Fuel pump should operate for about 2 seconds. Observe fuel pressure. If fuel pressure is greater than 66 psi (4.6 kg/cm 2 ) on CSI fuel system or 62 psi (4.4 kg/cm 2 ) on SFI fuel system, go to next step. If fuel pressure is not greater than specified, go to step 16). 15. Relieve fuel pressure. Disconnect fuel return line. Attach a fuel hose to fuel regulator return line and place in a container. Turn ignition on. Observe fuel pressure within 2 seconds after turning on WARNING: Begin fuel system trouble shooting and diagnosis with fuel system pressure test. Relieve fuel system pressure before disconnecting any components or installing fuel pressure gauge. Ignition. If fuel pressure is greater than 60 psi (4.2 kg/cm 2 ) on CSI fuel system or 56 psi (4.0 kg/cm 2 ) on SFI fuel system, go to step 17). If fuel pressure is less than as specified, go to step 19). 16. Turn ignition off for 10 seconds. Turn ignition on. Fuel pump should operate for about 2 seconds. Observe fuel pressure. If fuel pressure is less than 60 psi (4.2 kg/cm 2 ) on CSI fuel system or 56 psi (4.0 kg/cm 2 ) on SFI fuel system, go to step 20). If fuel pressure is greater than as specified, go to step 28). 17. Check for restricted fuel line from fuel pressure regulator to point where fuel line was disconnected. If fuel line is restricted, go to next step. If fuel line is not restricted, go to step 23). 18. Repair restriction in fuel return line from pressure regulator to the point where fuel line was disconnected. After repairs, go to step 27). 19. Repair restriction in fuel return line to fuel tank. After repairs, go to step 27). 20. Check for restricted fuel line or fuel filter. If a problem is found, go to next step. If a problem is not found, go to step 22). 21. Repair or replace restricted fuel line or fuel filter. After repairs, go to step 27). 22. Turn ignition off. Connect a fused jumper wire between battery voltage and fuel pump test terminal. Slowly pinch fuel line return hose. Fuel pressure should increase to greater than 66 psi (4.6 kg/cm 2 ) on CSI fuel system or 62 psi (4.4 kg/cm 2 ) on SFI fuel system. If fuel pressure increases to greater than as specified, go to next step. If fuel pressure is less than as specified, go to step 24). 23. Replace fuel pressure regulator. After repairs, go to step 28). 24. If fuel pressure is less than 60 psi (4.2 kg/cm 2 ) on CSI fuel system or 56 psi (4.0 kg/cm 2 ) on SFI fuel system, go to next step. If fuel pressure is greater than specified, go to step 28). 25. Check for faulty fuel pump, partially disconnected fuel pulse dampener/pulsator, partially restricted fuel pump stainer or incorrect fuel pump. If a problem is found, go to next step. If a problem is not found, go to step 28). 26. Repair or replace fuel pump, partially disconnected fuel pulse dampener/pulsator, partially restricted fuel pump strainer or incorrect fuel pump. After repairs, go to next step. 27. Replace fuel feed/supply line. After repairs, go to next step. 28. Using scan tool, select DTC, CLEAR INFO function. Attempt to start engine. If engine starts and continues to run, go to next step. If engine does not start, or starts and stalls/dies, go to step 2). 29. Warm engine to normal operating temperature. Using DTC, select DTC, FAILED THIS IGN function. If any DTC(s) are displayed, diagnose and clear DTC(s). See the TESTS W/CODES article. If DTC(s) are not present, go to next step. 30. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If additional DTC(s) are stored, diagnose and clear DTC(s). See the TESTS W/CODES article. If DTC(s) are not present, system is okay. CAUTION: DO NOT allow fuel pressure to exceed 75 psi (5.3 kg/cm 2 ).