Fuel pump relay

1. Check the fuel pump fuse: Locate your vehicle's fuse box (usually found under the dashboard or in the engine compartment) and check the fuel pump fuse. If it is blown, replace it with a fuse of the same amperage. If the fuse is fine, proceed to the next step.

2. Check the fuel pump relay: The relay controls the power supply to the fuel pump. You can typically find the fuel pump relay in the fuse box or a separate relay box. To test the relay, you can swap it with an identical relay (such as the horn relay) and see if the fuel pump starts working. If it does, the relay is the problem and needs to be replaced.

3. Inspect the wiring: Damaged or corroded wiring can cause a loss of power to the fuel pump. Check the wiring leading to the fuel pump for any visible damage, corrosion, or loose connections. Repair or replace any damaged wires and clean corroded connections.

4. Test the fuel pump for proper function: If you have access to a multimeter or test light, you can test the fuel pump terminals for power when the ignition is turned on. You should see a voltage for a few seconds as the pump primes. If there's no power at the terminals, the problem could be a faulty ignition switch, fuel pump control module, or a wiring issue.

5. Faulty fuel pump: If all the above steps show that power is reaching the fuel pump, but it is still not working, the pump itself might be faulty and need replacement.

Switch the horn relay with the c/op relay to see if it’s the relay. I don’t know why they have to give u complicated answers.

Which pin at the relay socket , pin 85,86 or 30 ,87 ? Here check out this video ! GM Fuel Pump Relay Testing

Either the fuel pump is not working, or the filter is totally blocked.
The fuel pump circuit needs checked to see if it's a wiring problem or a failed fuel pump. There will be (probably) a fuel pump fuse in your fuse block, and a fuel pump relay under the hood.
If you check the fuel pump wire for power at the gas tank connector while the engine is cranking over, and there is power there, and the ground for the pump is good, then the pump is not working and will have to be replaced. If you do not have power when cranking, the wiring at the fuel pump relay will have to be checked. Simple relay- has a power feed for the pump at one relay terminal (it is hot at all times), and a fuel pump wire to pump on another terminal (the power out for relay). When relay coil side is energized from a signal from computer, the relay contacts close and power is sent to the pump. The other relay terminal is a ground for the coil side of relay. Pull the relay out and you will see the diagram etched on it. If there is a fifth terminal, that could be a pump prime terminal, or a way to keep the pump running when engine is running through the oil pressure switch. But when cranking the engine, the computer will signal the relay to send power to the pump.

9.5 volts sounds like the power coming from the gas gauge.
I am showing a relay module with the fuel pump and pcm relays built in along with two other relays. The fuel pump relay should not be accessable. In most cases the pump relay gets power from a 20amp fuse and the computer grounds the relay when needed. Power goes from the pump relay to the inertia switch then to the pump. So the inertia switch should be hot when the pump relay is activated.

Have you checked the fuse/relay or the reset button (if equipped)?

CHECK THE INERTIA SWITCH FIRST , IT'S LOCATED BEHIND THE PASSENGER SIDE KICK PANEL THERE IS A ACCESS HOLE TO CHECK RESET BUTTON.. CHECK FOR POWER AT THE TERMINALS WHILE THERE ...THE FUEL PUMP WILL RECIEVE POWER FOR 2 SECONDS WHEN IGNITION IS TURNED ON IF NO POWER (12VOLTS) CHECK FUEL PUMP RELAY IN ENGINE COMPARTMENT RELAY BOX , IF NEEDED SWAP RELAYS AND RETEST , ALSO THE POWER RELAY SUPPLIES VOLTAGE TO PCM WHICH IN TURN ENERGIZES FUEL PUMP RELAY SO CHECK BOTH RELAYS ALSO

HOPE THIS HELPS

You need to verify that the pump is not getting power,if this is true then you need to see if the fuel pump relay is being powered and if not then check the inertia switch,if it is being powered up check to see if the relay is swithing power to the pump,if not replace the relay,if so you have a broken wire between the relay and the fuel pump,repair as needed

You should test your fuel pump relay. Do you have any codes in the computer?

Hi..my name is Keith..and the 2 things that i know of...that will not let power go to the fuel pump is 1..the fuel pump relay being bad..or 2..that something has tripped the Inertia Switch...and it needs resetting..i hope this will help