New engine but low power. 7.3 IDI

[John Lahore]

What exactly was the problem?

Low fuel pressure, At the time I tested it, it was already pretty warm, I ASSUME that last week when it was 40 deg cooler, the pressure would have been much lower.
As I drove it (and the fuel circulated and warmed) the pressure drop under load almost went away entirely.
I also am assuming that this is due to a dirty fuel filter and low temps (more viscous fuel) last week.

If I wasn't watching the pressures, I would have said the problem just went away.

 

[Duke57]

Low fuel pressure, At the time I tested it, it was already pretty warm, I ASSUME that last week when it was 40 deg cooler, the pressure would have been much lower.
As I drove it (and the fuel circulated and warmed) the pressure drop under load almost went away entirely.
I also am assuming that this is due to a dirty fuel filter and low temps (more viscous fuel) last week.

If I wasn't watching the pressures, I would have said the problem just went away.

So between warmer temps and fresh fuel filter, problem solved. Cool

 

[John Lahore]

Put my new fuel filter on, on Sunday.
Wow, even the pressure at idle went up from 4 to 5 PSI,
Now the pressure stays above 4.5 PSI at all times.
The old filter (that came with the engine) was packed with junk, It spilled out as soon as I took it off and filled half the cup I poured the oil into.

 

[Alwaysreadyrob]

Does it have a turbo and if it does is it spooling up ?
Do you have a boost gauge ?

 

[John Lahore]

Does it have a turbo and if it does is it spooling up ?
Do you have a boost gauge ?

No Turbo.