Engine Stalls at low revs

[Taz59]

anyone got the part number for the low pressure pump, (Pump Pressure 8psi ?)

 

[alldodge]

I'm finding 3858261 and 3858714 (item 68) but does not clearly state Gi-G. Search and found them on ebay and they list for some different motors.
https://www.marinepartseurope.com/en/volvo-penta-explodedview-7797410-23-10770.aspx

While 8 psi is less then what was found in the spec, looking at the pump online I'm seeing 6 to 8 psi is good. Being the low pressure pump, 8 psi should be plenty to keep it running. If you were loosing at WOT then maybe it could be the cause.

What was the high pressure pump output?

 

[Taz59]

I have fitted a new fuel cell and its working fine, so I wanted to overhaul the old one and keep it as a spare.

The Old Low Pressure Pump Reading was 18psi New Pump 10psi
The Old High Pressure Pump Reading was 54psi New Pump 50psi

The manual says low pump should be 8psi and high pump should be 50- 60 psi