Fuel pump wiring?

If engine is running yes if check engine light goes on. you'll need a scanner to remove the code if there is one. However, you will not have to clear the codes in order to start the engine. The vehicle should run if you shut the key off, plug everything back in and then start the engine. Basically the PCM will see the circuit is intact again and the codes will go stored and allow the engine to start.

Here are the wiring diagrams requested they are for the fuel pump and engine wiring with a guide to show how you do the testing

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.

This may be the same wiring diagram that you have? For the pump itself, gray wire is voltage, black wire is ground. The other two wires are for dash gage. The coil side of relay, dark green wire with white tracer is voltage from computer. Black wire is constant ground. Here are the complete engine and fuel pump wiring diagrams. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Depends on the type of aftermarket pump. Most high pressure pumps use a pair of toothed gears and are pretty restrictive when forcing fuel through them when they aren't running. With a fuel return system with the pressure regulator on the fuel rail on the engine, that will cause stalling due to low fuel pressure when the highest volume is being pumped, which is during coasting.

Yes, the fuel pump may be the issue. The fuel pump and level sending units are replaced as a single componet.
Before replacing your fuel module asmebly check your fuel pressure. If you have a 4.8L, 5.3L, 6.0L or 8.1L your fuell pressure should be 55 - 62 psi with the key on - engine off. If you have a 5.0L or 5.7L the key on - engine off pressure should be 60 - 66 psi. With the gage still attached the pressure should only drop about 5 pounds or so once the key is shut off. If the pressure contiinues to bleed off, check for leaks in the gage, gage connection or fuel lines. IF no external leaks are found, the fuel pressure is bleeding back though the pump and is a symptom of a failing fuel pump.
The noise from the fuel pump also indicates that it may be failing, but some GM fuel pumps can be very nioisey.
Adding fuel when the tank is almost empty may temporarily improve the pump performance. With in the tank pumps the fuel lubricates and cools the pump. If the pump is failing it will heat up, adding the fuel would help cool thepump and make it work a little better for a short time.
All that said, first check fuel pressure to be sure it is correct and holding the presssure.
Let me know what you find and I'll do my best to help.
Dan

Yes, check the fuel pressure with a guage. When was the last time your fuel filter had been changed? Also, pull the vacuum line off the fuel pressure regulator and determine if there is fuel in the vacuum line, if so, the diaphram is bad (in the regulator) and needs to be replaced.

It could be. The easiest way to check is to see if there is adequate pressure at the fuel rail. OR, see if it will start a couple seconds using starting fluid. If it does, the problem is fuel related.

Try that and let me know what you find or if you have other questions.

Glad it's fixed. Let us know if you have questions in the future.

No there's no such thing unless its a FORD product called the fuel cut off inertia switch. Try checking the fuel pump relay 1st that checks out-test out the oil pressure sending unit which is responsible to power the pump after it starts up. Be advised that the fuel pump relay only comes On for 2 secs to prime the fuel system when it fires this is where the OPSU goes in.

Have you checked the regulator? Is there any fuel getting into the vacuum hose to it? Finally, allow the fuel pressure to build, take a pair of vice grips and pinch of the rubber hose to the fuel rail and shut the key. See if the pressure drops. If it does, the problem is most likely the it's the fuel pump. If it loses fuel pressure, it's the regulator.

Let me know what you find.

Joe

Check for power to it. If there is power, replace the pump. Also, check grounds. If there is no power to it, check the fuel pump relay under the hood. See if there is power there.

How are you testing this? It only powers for two seconds when the key is first turned on and resumes when the computer see and RPM signal from cranking.