Beckett oil pump 6527

That is not. The factory pump setting is probably 100 PSI
The burner may require 140 PSI.
Call the company and ask if their technicians are required to follow manufacturer instructions when doing repairs or replacing parts?

If the say YES then ask them for the report of the pump pressure and the combustion analysis results as listed in the replacement pump instructions that you found online

BDR529 said:

Replaced pump on what?

on any Beckett oil burner equipped with a clean cut pump.
When a fuel pump is replaced on any oil burner, regardless of the application, the fuel to air mixture MUST be known in order to get the adjustments correct.

BDR529 said:

Was it a retro fit burner on a Arco liner? You going to reinvent the wheel with 20 calls backed up?

All pumps are shipped out at 100psi as you know. All industry standard is +/- 5% no matter what it is.

Someone is looking to make problems and call backs for other reasons.

Doesn't matter! You justify crappie work because your backed up life's a ****! Don't take any new calls!

You're ASSUMing its correct, Check and verify all parts! The customer is paying for a service, part of that service is to properly set it up, perform a combustion analyses.

BDR529 said:

Was it a retro fit burner on a Arco liner? You going to reinvent the wheel with 20 calls backed up? All pumps are shipped out at 100psi as you know. All industry standard is +/- 5% no matter what it is. Someone is looking to make problems and call backs for other reasons.

The fact that it's a retrofit burner on a very old boiler makes combustion analysis and measuring pump pressure even more important. There is no excuse for not doing the job properly.  I can do these two things in 15 minutes, that's not going to make or break the rest of the day.  Don't do a job if you don't have the time, skills, knowledge or tools to do it correctly.