Volvo 300 CR V8 fuel pump problem

[Martyfishing]

I recently repowered my 22' fishing boat with the new Volvo 300CR. Ran great for 60 hrs, then fuel pump went out. Next fuel pump lasted 8 hrs, next 3 hrs. Last two failures were to low pressure pump which fails and burns out the 20 amp fuse feeding pumps. I checked fuel tank and supply lines and they are fine. Pumps seem to be getting proper voltage. Pumps are expensive and hard to find, I have a new one coming and don't want to burn it out. Any ideas will be appreciated, I want to go fishing again. Thanks, Martin

 

[muc]

Check how much vacuum there is between the tank and pump while at full throttle. Should be less than 2”.

 

[Lou C]

Might want to take a look at the anti-siphon valve on the gas tank. On older boats they can get corrded internally and then the ball sticks and restricts fuel flow.

 

[Martyfishing]

Check how much vacuum there is between the tank and pump while at full throttle. Should be less than 2”.

Checked that out, no valve, thanks for your imput.

 

[muc]

What was the vacuum at full throttle? Did you see any air bubbles in the clear line when preforming the test.

It's not bad luck or bad fuel pumps --- you have something wrong.

HOW TO: Testing your boats fuel system.

Note, this was originally posted courtesy of Don S. Minor edits and pictures added by CaptJason A lot of you folks out there seem to be tearing into carbs quite a bit. Before you choose to open up a carb, you really need to look at what's feeding the carb first, and that is the boats fuel...

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