6.0 fuel pump loosing pressure

[Jeckstine]

When this pump goes bad is it an all or nothing or can it gradually loose pressure?

[Newman]

What are your symptoms? Did it start after changing the fuel filters?

[Jeckstine]

I had blown head gaskets so I pulled the engine apart, had the heads checked and surfaced. When it was apart I did all of this also. ARP's, black onix, updated oil lines for turbo, 6.4 banjo bolts, updated fuel regulator with blue spring and I put a crossover line on the back of the heads and changed all filters.

At idel it reads 50lbs of pressure and if you drive it it will drop as far as 30lbs at wot. Light throtle it is at 45 psi. never been up in the 60's like it should be. i have a auto meter gauge in the test port
My engine is a 2004 6.0

[Jeckstine]

and the injectors are stock.

[Newman]

Sounds like you have a bad pump. Is it leaking fuel anywhere externally

[Jeckstine]

turns out the crossover line had air traped in it. I put bin one stock banjo bolt and one high flow 6.4 banjo bolt. that unbalanced the system and forced the air out! I got off cheap for a change.

[Miskeeter]

I just recently changed my fuel filters and now i am having surging issues at wot. turbo is building 26 psi of boost but truck feels like it is going nowhere... Did i screw something up with the recent filter change or is my pump failing? Is it hard to replace the pump?

[Jeckstine]

the fuel pump is on the drivers side fram rail at that filter. It is easy to change. You may also have traped air in the system from the filters.

[Miskeeter]

Thank you so much for the quick relpy. I was just reading the proper filter change steps and I have realized that I did not purge the air from the system after the change by turning the key to the on position 3 times for 30 seconds. How would I purge that air now? I didn't realize that there was even a problem until i installed a more powerful tune that required more fuel, then at wot it sputters like it's starved for fule (or there is air in the system) otherwise it runs just fine. I have an 03 f250 with a 6.0 PS

[Jeckstine]

Once the air is past the filters and in the lines and fuel rails the only way for you to get it out is through the injectors. You just have to drive it and it will work its way out.