Vehicle ran out of gas, after adding 4 gal of gas still no start. Replaced blown 20amp fuel pump fuse , no start. Check power on pin at fuel pump relay, battery voltage present . Is the pump bad, vehicle has 173k miles on it, uncertain of fuel pump age. What else should I check?

Fuel pump dead or dying. Injection systems need 110 psi, and a pump only doing 30psi will still not run .

Guessing when you say pressure that you have fuel pressure and that the fuel pump is working but the injectors aren't pulsing and injecting fuel into the cylinders. The way your fuel system works is that you should have constant power at each injector and the vehicles computer (the ECM) gets readings from different sensors and send a quick ground pulse in order to complete the circuit. each time the ECM sends a ground pulse, that's when the injector injects fuel so the ground signal/pulse is quick (on and off, one and off..you get the idea). The first thing I would do if your fuel pump is pumping and you have fuel pressure is check the fuse. The fuse you want to check should be a 20 amp fuse in the fuse panel under the hood of the vehicle in the engine compartment. Below is a diagram of the fuse layout and I have marked the fuse you need to check (the ECM 1 fuse). If that fuse is blown you will not have that constant power at the injectors. If blown replace and that should solve the problem unless it blows again which would mean you have a short. If it isn't blown make sure you have power at all time when the key is on. The pink wire at each injector should be the power wire. If no power you need to locate the open wire for that circuit (coming from that fuse to each injector). This is where I would start. If you need further instructions as far as any more testing procedures, reply/comment here or feel free to email me directly at [email protected]. Hope it's as simple as a fuse for your sake and I hope this helped.

check to see if the fuse blew again, make sure fuse has power to it,try hitting the bottom of the gas tank with a hammer while someone trysto start it at the same time if it start than you know the fuel pump is bad if it doesn't start check the power supply to the fuel pump in the gas tank itshould have 12volts while cranking engine

It sounds like you are on the right track. Here are the basics for your pump. I took a guess at the engine size and went with a 4.3 V6, Hopefully that is it.

1. There is an ECM B fuse, 20amp that feeds one side of the relay.
2. You have already mentioned the relay. The other side of the relay feeds from the VCM or Vehicle control module.

Remove your relay and check pin #3.. You should have 12volts with key on. If not check the ECM B fuse.
If you cross pin#3 and #5 on at the relay location you should feed 12 volts to your pump and it should run. If it does not, look for a ground problem on the black pump wire or a broken wire between the relay and the pump. I show a gray power wire to the pump.

Hope this helps.. Best of Luck..

• Very possibly could be the fuel pump. Often times when running the tank dry on pumps, especially ones that have been in the tank for a while and are partially clogged already, all the contaminants get caught up in the sock on the fuel pump and it becomes clogged and collapses and the pump fails.
• When you turn the key to the on position do you hear the fuel pump hum? If not this could be the fuel pump relay and I would suggest to check this before tearing into the pump.
• You may want to check that fuel filter too as they get clogged and prevent the vehicle from starting as well.
• Make sure the gas cap is on tight as well. Sometimes a vehicle will not start if the gas cap is not on tight of is on crooked. Check the seal on the gas cap too for cracks and or rips/tears. Try a dab of engine oil around the gasket to help it seal and make sure it clicks a few times after it twisted on.
• Hope this helps and thank you for using FixYa.

Regards, Tony

The no fuel problem is usually caused by a defective or bad fuel pump. The blown fuel pump fuse is actually pointing to the pump or circuit being bad.

Need to drop the tank, so let someone who has done it before do it, it's worth it.

Gasoline is kind of dangerous to deal with since it is extremely flammable and volatile.

When running out of gas the fuel filter often gets clogged because the last bit of gas takes all the dirt at the bottom of the tank with it.

It's possible that you have an air bubble in the fuel line. This blocks fuel from reaching the engine. To clear it, you will have to bleed the line at the fuel filter.

The other possibility is that the fuel pump is not working. Turn the ignition key to the on position. You should be able to hear the fuel pump humming. If not, check the fuel pump fuse, in the fusebox under the hood. If the fuse is ok, you will need to trouble-shoot the pump.

Fuel pump relay is on the firewall or fender. It is the blue box type. You will have to check it with an ohmmeter or get multi-tester.

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First, obviously, put gas back in the tank.

Check the fuel pump fuse, (20 amp yellow fuse in the lower left corner of the group). If that is not blown, turn the key on and pound hard on the bottom of the fuel tank. The fuel lubricates the fuel pump, once it runs dry, the pump can lock up. Once the pump is immersed in fuel again, a sharp jolt will unstick it and let it pump up to pressure again. If it locks up for too long, the pump will burn out and need replaced.

We found this out by accident, got mad and pounded on the bottom of the tank and the pump jumped to life.