Volvo 5.0 glx surging issue

[Derklaw]

Ok so this problem has been persistent. New battery, new leads, new plugs and wires, new injectors, new distributor cap, new high pressure fuel pump, boat runs perfect in the driveway, take it on the water and put it under load and it gets about a half a Kilometer out and starts surging, drops down to idle and then when you chop the throttle it sputters and dies. I’m stumped at this point

 

[alldodge]

Assuming GXI and not GIX
What is the motor serial number?
What is the fuel pressure when it starts to surge?
Is this a new to you boat or just a new problem?

 

[Senior B]

Sounds like a bad low pressure / boost fuel pump .. Says above that you replaced the high pressure pump. A bad boost pump, the boat will start and run, but when you take off it will quickly become fuel starved. Just a thought.

 

[stouchton]

I am with Senior B on this.... and another clue will be if you high pressure pump is hot. The high pressure pump needs to be moving fuel to cool itself, and when there is no fuel in the tank fed by the low pressure pump it will starve and run hot - just experienced this myself. Oh - and that is why the small tank is water cooled - it is to cool the high pressure pump that would otherwise be recirculating hotter and hotter gas.

High pressure pump should run warm - I was surprised when mine was almost too hot to touch.