2002 GMC Sierra 1500 fuel pump relay where is it

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

You checked the fuel pump relay in the engine compartment fuse / relay box ? The fuse that powers the fuel pump ? ECM B fuse 20amp - engine compartment fuse panel . Is the PCM turning on the fuel pump relay ? Do you know how to test automotive electrical circuits using a DVOM - digital volt ohm meter an a wiring diagram ?

GM Fuel Pump Relay Testing

on opposite side of fuel pump relay .there the relay and fusible link then at the end there is a small block it contains the fuse 20 amp

the Fuel Pump relay and fuse is under the plastic cover under the hood at the firewall on the passengers side.

When your replaced the pump did you replace the fuel filter? You may have a fuel pump relay causing you some grief. I believe it is located in the engine compartment in the fuse center on the left inner fender. Check the relay and any related fuses. Check the electrical connection at the pump. They had problems with some of them and they would get kind of hot and distort and corrode. They have new updated ones that can be easily installed.

Check connections at/or replace oil pressure switch. Your oil pressure switch is also a safety feature that shuts off power to fuel pump in case of accident or rollover.

I would run the vehicle, if the relay get pretty warm or hot, I would say replace it, otherwise a continuity test can be done with a volt meter set on OMHS.

first off do not use a test light. use a circuit tester. what you saw as 5volts is called a reference signal. the cars computer(much like your home computer)works only off 5 volts. if you use a test light(the old kind with a light bulb.)you will fry the computer. second, are you saying the problem is still occuring after these parts have been changed?

the fuel filters are in tank and not serviceable on most newer gmc trucks until the fuel pump dies

The fuel sending unit only controls the gas guage not the fuel supply to the vehicle. The pump is twelve volts. If you are not getting twelve volts on the PUMP wires check the fuel pump relay and the key circuit to it. If you have to cycle the key three to four times rapidly to get the vehicle to start check the fuel pump pressure at the regulator for manufacturer specs. An injector stuck open will also cause same problems you are describing.