Have 2002 envoy we've changed the pump, nothing then I discovered that there is no power getting to the fuel pump relay w/ key on or off or cranking??

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The alternator isn't charging , battery drained . Is the battery symbol lit on the instrument cluster ? What guy said something about low voltage ?

If by manually touching the relay points give you power to the fuel pump , i would assume that your relay is bad on the power side.

try to exchange the relay with one other of your fuse box . If it works fine with other relay change the relay and you'll be on your way.

Just for you to know!!!

Here is how a relay works you have a driving side and a power side . the driving side is in fact an electrically operated switch that when current is apply closes the switch that is on the power side.

Test your relay by asking somebody to put one finger on the fuel pump relay. when you have power on and of on the driving side of the relay, the other person will sence that the relay is clicking . if it desn't change the relay cause it's burnt on the driving side. if it does and you don't have power to your fuel pump chnage the relay cause it's burnt on the power side.

Do you have a test light? If not, go buy a cheap $5 test light-one with a lead to clip to a ground, and with a needle type probe.
Pull the fuel pump relay out of the terminals it is plugged into-you need to check if the power feed for the pump is still available at the relay. Clip the test light lead to a ground and touch the test probe to the positive battery post-to check that your ground is good- tester should light up. Now touch the probe to all of the terminals that the relay plugs into. One terminal should have power with key off. If no terminals have power, you have lost the power feed for the pump. Double check all your maxi fuses in the power distribution box. Either a maxi fuse or a fusible link will be the power feed for the fuel pump relay.
If the power feed is there at the relay, try a new relay. If still no pump, a shop will probably have to check your fuel pump circuit.
Did you check for power at the fuel tank while the key was held in crank? When the engine is cranking, the fuel pump wire should have power. When the key is turned to on, the fuel pump should have power for about 2 seconds, to pressurize the fuel system. Then when key is turned to crank or start, the fuel pump should stay on.

Did you check the ASD relay and fuel pump relay for power and ground before you replaced those parts ?

If the passkey system were not working the engine should not crank and the fuel injectors would be dead. The security light would also stay on.
The fuel pump relay gets battery voltage and also voltage from the key switch. The computer grounds the relay to power the pump.
The crank sensor does not come into play until the engine is cranking and it supplies a signal for the ignition and injector pulse.
Are you not getting power from the key switch to the relay, or from the battery side to the relay ?

I would check the starter for voltage first - there is a starter relay that is grounded by the PCM. If the ASD relay is faulty the pcm won't have power. You should have battery power to the starter and power on the solenoid when you turn the key to start.

Did you do it like this? Voltmeter: black lead on negative battery terminal, positive lead on one of terminals on coil side- turn key to on, and see if there is voltage for about 2 seconds. If yes, check negative terminal of relay's coil side. If no voltage, move positive lead to other terminal for coil side. Turn key to on, and see if you have voltage for about 2 seconds. If yes, test negative side of relay's coil for good ground. If no signal at either terminal, the signal may be lost from the pcm.

When you turn the key to on, this will prime the fuel system-pump will turn on for only 2 seconds with key in on, and then if no crank signal, pump will turn off (the relay will not stay energized, so no power will go to pump). But when the engine is cranking over, the relay is energized, the coil side will stay powered as long as engine is cranking. After the engine is running, usually an oil pressure switch is tied into the fuel pump circuit, so the relay is no longer needed to put power to the pump. The pump will always be running when engine is cranking, and when engine is running, but the relay no longer is needed when engine is running. See?

Under the hood, there should be a fuse block. Remove the cover and there will be a 20amp(i think) fuse that protects the fuel pump and starter circuit. I've run into this problem many times and every time it ends up being the starter that blows the fuse.

1. Remove the fuel pump relay from the junction box
2. Crank the engine.
3. Allow the engine to start and stall.
4. Crank the engine for an additional 3 seconds to ensure the relief of any remaining fuel pressure.
5. Disconnect the negative battery cable in order to avoid re-pressurizing the fuel system.
6. Install the fuel pump relay to the junction box .
7. Tighten the fuel filler cap.