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Fuel pump replacement

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F.Scott

New member
I have a 2016 25 hp mercury four stroke outboard.
The engine will start and run, but when I take it toward the top end, it sputters and dies.
I want to do a DIY fuel pump change, but I have found out there are actually two fuel pumps. The question is do I have to replace both of these. The pump itself is about $200. There’s another pump in the vapor separator which is about $700. Do I need to replace both of these or should I just start with the $200 pump. Or is that just a waste of time and I should replace them both. Appreciate any advice anyone gives me. Thanks, Scott.
 
Have you used the manual primer ball to take the place of the lift pump to see if that changes the situation?
 
Clean the vapor tank.----Replace filters BEFORE you spend an obscene number of beer tokens on new parts.----Also test run with another fuel tank and hose !
 
I am the 2nd owner of this boat, once my motor starting acting up, I immediately replaced the fuel tank and hose, and the fuel filter.
I just watched another video of cleaning the filter at the bottom of the fuel pump in the vapor tank. Is there another filter I should be looking at?

Thank you for preserving my beer tokens, I will be needing them once I get this back in running order!
 
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0R690580.

Two fuel pumps. A low pressure mechanical pump to supply gasoline to the vapor separator tank (VST) and a high pressure electrical fuel pump to supply gasoline to the fuel injectors.

The fact that the motor runs well for most of the time would lead me to believe that the low pressure mechanical pump is not doing its job of keeping the VST filled with gasoline. Reasons could be several things. Pump is failing or perhaps there is a restriction to fuel flow.

If and when you start to run the motor to the point where it sputters and dies, pump the primer ball to do what the mechanical pump should be doing. That is, keeping the VST full of fuel. If the motor then runs well you have eliminated the costly high pressure electrical fuel pump from the equation. You will then continue to troubleshoot to determine why the mechanical pump is not doing what it is supposed to be doing.
 
Awesome explanation. I will get to work and let you know how it goes!
And I was looking at about 750.00 for the high pressure pump online, that is much more reasonable (if required).
MUCH APPRECIATED!!!
 
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