Before I took the motor out of my truck to do the 6.0L swap there was often a high pitch whining noise coming from under my bed near the fuel tank. I wasn't sure what the problem was but now that I'm about to wrap up the project I would like to take care of the problem while I'm at it. Any of you other guys heard this?

 

Most likely the fuel pump

 

My inline 255lph pump whines pretty loud sometimes and then sometimes it doesnt. No real reason.

 

might as well change it, If not now you will later.

 

So, what should I replace it with? Where to buy? Prices?

 

From what I've heard, even some new pumps can be noisy but I agree that now would be a good time to replace it. Good luck!