Need Help with losing power

[Duckslayer21]

Here is what I have done. Have 05 Durmax with 206k. I have changed the fuel filter housing, filter, (whole unit) and the two hoses that are connected to it. I also flushed the fuel cooler and the fuel likne go back to the tank and cooler with air.

Here is the problem: I am trying to leaving with the Fifth Wheel tomorrow at 6pm central.

When driving with no load over 68 or 50 with a heavy load I lose power and can only do 66 with no laod or 35 with the load. I would say it feels like it is not getting enough fuel.

I had a friend use a GM computer to pressure test the fuel system. When the pressure gets to 160 MPA it bogs then the test defaults. It will not get over 160.

Thanks for the help

[andy-stevenson]

Have you checked the air filter? Any codes?

[Duckslayer21]

Just clean the Air Filter but I have a spare and will try that.
The code doesn't fit. The code was DTC P1093. Says to re do the hose fittings on the fuel line. A neighbor (Chevy Mechanic) did a fuel pressure with the computer. When doin the test the Pressure gauge did not bottom out. He said that if it was the fuel lines the pressure gauge should have bottomed out during the test. He is going to call GM tech line tomorrow when he has time, but I am limited on time.

[andy-stevenson]

Did you check further down the line? Around the fuel tank and fuel cooler?

[Duckslayer21]

I did not notice any leaks around the cooler I did not look around the tank.

[andy-stevenson]

You typically won't see a leak as the injection pump pulls fuel from the tank so if there's a small leak it more so sucks in a bit of air.

[Duckslayer21]

I have another friend who is a Chevy Mechanic was texted me that he is leaning toward bad fuel that has or is still clogging the fuel system.

If so do I take the bed off and flush the full tank I just bought and then blow air through the fuel line going back to the tank? Then how do I flush from the fittings on?