Anyone else have a situation when your truck is running good and once you hit about 1/4 tank or less and first gear runs sluggish?

 

That means the check valve in the pump has failed and is letting the bucket drain. This means when you accelerate the fuel in the tank drains out of the bucket to sit in the back, causing the fuel pump to cavitate, which means you lose fuel pressure.

 

Welp looks like it's time to install my walbro pump