truck wont start after fuel pump replacement

For future reference, I had this same problem when replacing the fuel pump on my 2002 s10 4.3L. Searched forever for an answer. It turns out that in order to remove the bed of the truck, you must disconnect the ground for the fuel pump, which attaches in the rear on the drivers side. IIRC it ran either in or alongside the harness for the tail light wiring. Once I hooked that back up, my truck started right up.

Did you disconnect battery and remove the relay before switching pumps? This ensures no power can short fuses or relays. Otherwise, test for power at pump with a multimeter. Retrace your steps on the wiring and make sure all harnesses are hooked back up.

Agree with everything c b 3 0 says! - Bed has no affect on pump circuit. Also if you had to replace the connector for the new PUMP MODULE, (i hope) make sure color code is correct, some dont match up. Read instructions again! Be sure the four wire connectors are making good contact. Was it a failed pump or a anti theft problem to start with? Security light in dash flashing while cranking? It does have a fuse as answer 1 says check it, under hood, relay should click each time key is turned on or starter is bumped, listen for it! Check to see if ground circuit to pump is good, black wire with white tracer i 'think', If no ground, i may be able to help. Post results.

does you have pwr to relay and fuel pump?

Check connections to mass air flow system? May be faulty or connections need cleaning?

2000 Chevy S10 V6 4.3 . Remove the bed to change fuel pump. installed new fuel pump .try to test before putting the bed back on, fuel pump wouldn't do anything..... check car wiring 3 times everything was good..... turns out we disconnected the ground to remove the bed at the driver side rear reconnected truck fired right up

I have a huge favor and I'm stuck my son has a 2003 gmc Sonoma pulled into our driveway went to start it back up it would not start checked everything and it seem to be the fuel pump so we purchased a new fuel pump and we still can't get it to start we have replaced the control module and it still won't start any buddy have any ideas

I JUST REPLACED MY FUEL PUMP ON MY 2002 CHEVY SILVERADO 4.8 I DID REMOVE THE BED JUST TOOK THE 8 BOLTS HOLDING IT AND HAD A FREIND HELP ME PICK IT UP ENOUGH TO LAY THE BACK END ON THE BACK BUMPER SO I HAD PLENTY OF ROOM TO HAVE EASY ACCESS TO THE FUEL PUMP SO I REMOVED THE OLD FUEL PUMP AND REPLACED IT WITH A BRAND NEW ONE FROM O'RAILYS PARTS STORE $153.00 CHEAPER THAN AUTOZONE THEY WANTED $170 FOR THIERS SO THE FUEL PUMP CAME WITH A NEW WIRING HARNESS THAT I HAD CUT THE WIRES AND SPLICE THEM TO MY OLD WIRES WHICH WERE COLOR CODED 2 BLACK WIRES ! ONE WAS A BIGGER WIRE GAUGE WHICH YOU CAN TELL BY CAUSE ONE WAS THIINER THAN THE OTHER AND I HAD ONE GRAY AND ONE PURPLE SO HERE THE THE PROPLEM THAT I CAME ACROSS WELL THE NEW FUEL PUMP CAME WITH THE NEW HARNESS AND A DIRECTIONS HOW TO RECONNECT THE WIRES BY THE COLOR CODE I DID EXACTLY WHAT IT SAID AND DIDNT START !!!!! WELL I COULD HERE IT COME ON BUT NO GAS COMING OUT OF THE FUEL LINE WHERE I DISCONNECTED THE FUEL FILTER LINE TO CHECK IF IT WAS PUMPING GAS TO THE ENGINE AND NO LUCK !!!! SO HERE IS THE DEAL ON THIS PROBLEM WELL TWO OF THE WIRES WERE CROSSED !!!! THE GRAY WIRE GOES GRAY ON GRAY NOT LIKE THE DIRECTIONS CALLED FOR ! IT SAID GRAY FROM MY OLD HARNESS GOES TO THE SMALL BLACK WIRE TO NEW HARNESS WHICH WAS WRONG !! SO WHEN I REWIRED IT GRAY TO GRAY ! IT PUMPED GAS RIGHT THRU THE FUEL LINE GOING TO THE FUEL FILTER LINE RIGHT AWAY !! I HOPE THIS HELPS YOU OUT MY FRIEND !!! IT WORKED FOR ME !!!