Is there any power to the fuel pump?
I have no power to the fuel pump on a 2002 silverado 1500 5.3. Check the grey wire with the key getting switched on. Still no power. , GM MASTER/WORLD CLASS.
Where is the fuse for the fuel pump?
ASE MASTER replied 9 years ago Check the ECM B fuse located in the under hood fuse box. This is the power supply to the fuel pump and relay. If the fuse is bad, then replace it to see if the fuel pump has power. The truck may start if the fuse is replaced but you will still need to replace the pump.
What’s the best way to replace a fuel pump?
If playback doesn’t begin shortly, try restarting your device. I like fixing things. all kinds of things. I do pretty much everything myself. I like making things.
How to troubleshoot fuel pump in GM 4.3L?
Once the intake air duct is back on the throttle body, have your assistant, inside the vehicle, crank the engine. 1.) The engine will start momentarily and after a few seconds will die. 2.) The engine will only crank but not start at all. 3.) The engine will start and stay running. OK, let’s find out what your results mean:
How to troubleshoot a no start GM 4.3L?
The following tutorial may be of help: How To Troubleshoot A No Start (GM 4.3L, 5.0L, 5.7L). CASE 3: The engine started and stayed running. This confirms that the fuel pump is starting to fail. The next step is to confirm the exact fuel pressure with a fuel pressure gauge to be absolutely sure.
Can a fuel pump cause a no start condition?
CASE 1: If your fuel pressure gauge read 50 PSI or more as the engine cranked. This means that the fuel pump on your 4.3L, 5.0L, or 5.7L is OK and not the cause of your No Start Condition. The next step is to observe the fuel pressure gauge’s needle (after your helper stopped cranking the engine).
I have no power to the fuel pump on a 2002 silverado 1500 5.3. Check the grey wire with the key getting switched on. Still no power. , GM MASTER/WORLD CLASS.
What to do if your fuel pump is not working?
Once you are under the truck and have a test light connected to ground and the grey wire then have the helper turn the key on. If you know all this and that is what you did let me know and we will go deeper but I would chase down that ground first.
How does a fuel pump relay get power?
The relay wires should have ground on two wires, power on one wire and switched power on another wire. To activate the fuel pump the computer actually connects one of the ground wires to complete the circuit and send power to the fuel pump.
What to do if your fuel pump has no power?
Check the ECM B fuse located in the under hood fuse box. This is the power supply to the fuel pump and relay. If the fuse is bad, then replace it to see if the fuel pump has power. The truck may start if the fuse is replaced but you will still need to replace the pump.
Why is the fuel pump and relay not working?
The ignition circuit, which includes the ignition switch, controls power to many components, including the fuel pump and relay. If there is an issue with the switch or the circuit, perhaps a wiring problem, then power to the fuel system may be cut off.
Where do I check for power to fuel pump?
If not all of them check for power at the ECM B fuse. And finally I am assuming you have the single tank and not dual.
ASE MASTER replied 9 years ago Check the ECM B fuse located in the under hood fuse box. This is the power supply to the fuel pump and relay. If the fuse is bad, then replace it to see if the fuel pump has power. The truck may start if the fuse is replaced but you will still need to replace the pump.