My truck seems to be losing about 50% of its power when it is below a quater tank of gas. I have never heard of this before what could it be? It has a brand new fuel pump. Please help!

 

So it runs fine as long as you have more fuel in the tank? Stock fuel pump/module? Why did you change the pump? What are your mods?

 

no mods yet. i changed the pump about 3 weeks ago because the problem was getting worse. it seemed to work good for two weeks then it started up again.

 

A properly functioning OEM fuel module should not be affected by the fuel level in the tank. Modified modules with aftermarket pumps can be sensitive to fuel level. Are any DTCs being set(SES light on)? Was the tank clean(ed)? No water in the fuel?

 

I cleaned the tank when I replaced the pump. The gas is good. But the SES light is on but I dont have a way to see what DTCs are being thrown.

 

Go to auto zone, they will let you use their scanner.

 

I guess i will go to autozone then and see what DTCs i am setting off and figure out if it has anything to do with the gas level.

 

that happens when your fuel batteries get low.