My 454 Rebuild

[Spareparts]

I have Torque pro so no.

 

[Spareparts]

AcDelco or Delphi or? New fuel pump

 

[Piratehunter]

ACDelco is my recommendation, the Delphi that replaced my original at 108k miles, lasted 7k miles. left me stranded way out in the back country.

 

[Spareparts]

Can just the pump be replaced. Anyone have the part #?

 

[Piratehunter]

yes it can, don't have the ACDelco # handy, replace the sock on the inlet too. Check on RockAuto.

 

[Spareparts]

New AcDelco pump ordered.
The old pump would idle at 45psi but under wot would drop to 37ish.
This should fix the fuel pressure problem. and hopefully the rough idle slight miss problem.
If it does not fix it the only thing i can think of to do next would be to put the original GM cam back in it. Maybe pull the heads and have a good look at them.

 

[Supercharged111]

New AcDelco pump ordered.
The old pump would idle at 45psi but under wot would drop to 37ish.
This should fix the fuel pressure problem. and hopefully the rough idle slight miss problem.
If it does not fix it the only thing i can think of to do next would be to put the original GM cam back in it. Maybe pull the heads and have a good look at them.

I had a pump do the exact same thing in a 454 truck I flipped, but when I dead headed it the pressure didn't rise any. Had a good used pump on the shelf and it fixed me right up.

 

[Spareparts]

Mine will rise to 80psi if i deadhead it. I don't think mine is pushing enough volume to hold pressure.
Also here is the on log i could get and its a snap shot.

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[Supercharged111]

Mine would drop pressure free revving, didn't even need to be moving. In your log I don't see knock retard. . . are you still on the black box? If so switch back to the 411. Of the 2 that's more likely to have better support.

 

[Spareparts]

The black box does not seem to report knock retard.
I don't really want to put the 0411 back in yet as i don't want to introduce more potential problems.
With either ecu on the old engine it did idle perfect and never a miss. Problems started with the new engine and i still suspect a bad cam.
Once the fuel pressure is fixed it's about all that's left. I have checked or replaced about everything else!