7.3 PSD Fuel pump Help!!

[White Monster]

I have 1999 F-250 PSD. I was going down the road and my truck acted like it was starving for fuel so i shut it off real quick and pulled over. I got the truck towed to my house and after replacing the fuel pump twice i still cant figure out the problem. The fuel pump turns on but it will not pull fuel from the tank. I have cleaned all filters in the tank and cleaned the tank out. I bought a new sending unit and still nothing. I can suck fuel from the supply line to the pump and i get fuel but when connected to the pump the pump simply will not push any fuel out. I checked the power going to the pump and i have plenty of power. What else could it be???

[jesilvas]

Is the pump actually running?
Have the pump draw fuel from a container on the ground and then just loop it back to the same container to see if it's working. Then reconnect the pump to the tank but let it pump into the container. Then draw from the container and let it pump to the fuel bowl.
That will be able to narrow down which part isn't working right.

[White Monster]

I did that already and it did not pump any fuel. Ive replaced the fuel pump twice and it is still not pumping fuel.

[jesilvas]

If it's not pulling from a plain container on the ground right next to, I almost wanna say it's a bad pump still.

[White Monster]

Thats what i was thinking to but i didnt know if it could be the fuel pump relay not allowing fuel to pass thru the pump or if was the crankshalf Position sensor.

[jesilvas]

You just said fuel is not pumping. If you hook it up to a container, see no fuel flowing into or out of the pump and you are SURE there is power at the pump connector with key on engine off, then the pump isn't working.

[White Monster]

Well i know that lol i just want to make sure im not missing anything else that i might have looked over before replacing the pump for the 3rd time.

[jesilvas]

Hope You're warrantying these pumps
Are you powering the pump with the OEM power supply or just straight 12V

[White Monster]

I sure am! Yes im using the OEM power supply as well. The pump i got from auto zone made by Airtex. I guess thats a new brand out. From what ive been told this brand is suppose to be better than their last suppliers. Ive never heard of them before but i gotta say im not to impressed so far.

[ToddOH43]

Originally Posted by White Monster

I sure am! Yes im using the OEM power supply as well. The pump i got from auto zone made by Airtex. I guess thats a new brand out. From what ive been told this brand is suppose to be better than their last suppliers. Ive never heard of them before but i gotta say im not to impressed so far.

Airtex + AutoZone = JUNK.

I replaced TWO AutoZone pumps in just over two years on my 2001 F350.

Replaced the last one with an OEM pump and havent had a problem since.