I cant find the mian power wire to my fuel pump

Because you don't know what your doing . The gray wire goes to the fuel pump , the green wire is actually dark green with a white trace , this wire goes to the PCM - engine computer . You may have fried the transistor ( high side driver ) This supply's B+ voltage to energize the fuel pump relay . If you look on the bottom of the relay , you should see 4 set's of #'s 30 , 87 & 85 , 86 . 30 should have B+ voltage , 87 goes to the fuel pump . Jumping those two should make the fuel pump run . Hooking the gray to the drak green / white one won't do anything.

GM Fuel Pump Relay Testing

Do you have a multi-meter or test light?
There is a fuel pump fuse, in the fuse/relay distribution box, did you check that? That fuse and the fuel pump relay would have a "hot at all times" designation. Use the test light to see if the fuse has power at it. Next move to the FPR, pull it out and check for power. One of the relay terminals (it is #30 designation on the relay) would also be hot at all times (this terminal is coming directly from the fuse). Use the test light to check for that.
Look at the relay: on the side is a descriptor, or a diagram showing the relay terminals usage: #30 is the power feed, #87 is the feed on to the gas tank to the fuel pump. The other two terminals are the "coil side" of relay, #85 and #86, the coil side is what turns the relay on (from a signal from the pcm) and lets power pass to the pump.
If you have power at the relay terminal, you can take a short jumper wire and jump terminal 30 with 87. this will check the wiring circuit- it will send power on to the pump, and it should start working. If pump does not work, check for power on the gray wire at the gas tank connector. If no power, (and you still have the relay jumpered) then you have a bad wire from relay to the gas tank. If there is power on the gray pump wire, but still no pump when it is connected, then possibly the ground on your car for the pump is bad, or you maybe got a defective pump. Not likely, but it has happened before.
Now if you can jumper the relay and turn the pump on, we are down to the problem: apparently the coil side of your relay is not working-not turning the relay on, because of a missing signal from the pcm, or because the ground for the coil side is bad, or maybe just a bad relay.

Here are two ways:
You can take the filler hose off from the gas tank and put a siphon hose in there. Siphon it into 5 gallon cans.

Another way is to pull off the main gas feed line that goes from tank to the engine. Just find a convenient spot to pull the line apart, like possibly right before the fuel filter. Then you will need to activate the fuel pump to have it push the gas out. The easiest way to activate the pump is to find the fuel pump relay (under the hood in the fuse/relay block) and pull it out. Then use a short jumper wire into the two correct terminals where the FPR plugs in. This will automatically start the fuel pump and you can push all the gas out of the tank.
Most of the time, the two terminals at the FPR will be numbered 30 and 87. Look on the relay for terminal identification. You are jumping the main power feed line at the relay to the line going to the fuel pump. Do not guess, or you could damage your engine computer if you put the jumper wire in the wrong terminal. At the relay, you are jumping the power side of relay. The other terminals at the relay are for the coil side of the relay. Jump the power side!

2007 GMC Sierra 1500 fuel pump relay Bing Videos


http://www.bing.com/videos/search?q=2007+GMC+Sierra+1500+fuel+pump+relay&FORM=HDRSC3

Try lowering the tank enough to get the filler hose off, then you can get a siphon hose into the filler opening.

Or, you could open the fuel line at the filter, then jumper the fuel pump relay terminals. Pump will turn on and push gas out the line. Careful to get your jumper wire into the right terminals. You can damage the computer if you put voltage into the wrong terminal. The relay will have one hot at all times terminal- find that with a test light. Then you will jump the hot terminal to the terminal that has the fuel pump wire going to the gas tank. The relay should have terminal descriptions on it. The jumper wire goes with the two power side terminals, not with the coil side of relay. Post back if that's not clear.

If yout cut out the inertia, have to put it back, because it controls another third fuel pump whish could be the one blocking the gas.

The easiest way to tell if your fuel pump is running is have someone inside the vehicle turn the key to the ON position... put your ear against the gas filler.. if you don't hear it buzzing your fuel pump is either bad or not getting power. If your fuel pump is bad, you will have to drop the fuel tank. be careful not to just let it drop down after you loosen the straps, this could lead to dammaged fuel lines.
Good Luck!

I think you should probably rebuild the throttle body if you have not. Over time, some serious **** can build up in the body and also, the gaskets can shrink due to age which can cause fuel blockages in the body its self.

Fuel pump relay? The switch is near the oil filter.

begin with routing checks with a multimeter or 12 volts bulb tester determin if you got voltage on 12 volt side of the coil secondly check the fuel pump to see if ifs working by losening the line on the carburetor or injector what ever you carry ensure that your points is set and gapped properly make certain that all ignition lights shows up when ignition is switch on that would help you figure which fuse is burn if there's any check for broken wires on battery terminals sometimes you might have to tug on it a bit to be certain.
try this for now