Mercury 40 HP Fuel System Rebuild | Mercury 40 HP Fuel Pump Replacement | Boats.net

John will show you how to remove the VST and open it to inspect the components. We’ll replace the VST pump and the float needle, and then get the tank closed back up and reinstalled.

VIDEO HIGHLIGHTS:
Installing new fuel pump - 1:50
Removing VST tank - 3:50
Disassembling VST tank - 6:50
Removing VST fuel pump - 9:25
Replacing VST pump - 10:20
Installing VST tank - 12:17

Find Mercury 40 HP outboard parts here:

Talk to us:

In the video we’re working with a 2003 Mercury 40HP 4-stroke outboard motor, but you may have similar steps for your Mercury outboard. If you’re not sure whether these steps apply to your motor, leave a comment and we’ll get back to you.

RELATED VIDEOS

Mercury 40 HP output seal replacement:

Mercury 40 HP water pump repair:

[tomfairbank]

How about after the vst tank? I’ve cleaned that out but still having problems. I assume it’s the injectors. Would love that part

[nateanderson]

Great explanation beyond the actual repair!

[stephancordell]

What about the high pressure valve on top with the hose nipple? It has a screen filter

[bobbyparker]

How much pressure should be comming out of the vst tank going to the fuel injectors. Was wanting to test it before tearing it apart. Thanks

[alanhagen]

I have looked through a pile of manuals but have not found anything regarding the VST. Could you provide a link to the manual you found the pics in?

[charlesbarger]

I know this is a old video but I have a question. When removing the low pressure fuel pump is it easier to remove the latch or the cowling to make room to get the pump out?

[alanhagen]

A further to my other message, what are the part numbers for th 2 pumps you had on hand and the needle and seat?

[nicoleatwell]

Would the 60 be similar in parts and lay out

[steventomlinson]

Great video, replaced alot of parts now when I pump my build I get fuel to filter starts great out fuel doesn't replenish back in fuel filter and motor stalls any ideas ?

[normwetzel]

Would it be possible for the pump motor to continue running when the motor is shut down? The first time it happened the only way to stop it was to disconnect the battery, What it sounds like is a pump motor running and one is not able to restart the motor, We disconnected the battery for about an hour and put the wires back on an hour later it was OK.

[jonasthiagofarias]

Qual bomba veicular usar no mercury 60 4 tempos ano 2015 e não apita ??

[ChaoticMN]

Great video, very professional. I plan on T/S one of these this weekend for poor low and high idle. This helped me know what to expect with the fuel system.

[norcaloutdoor]

Can you show how to drain the fuel out when un-use

[billyzamora]

What should the p s i's be. In the fuel pump

[edwardabrahamiii]

I need some for my 2020 merc 150 4 stroke

[niceguydmm]

Can you buy the assembly and just swap it out?

[georgecave]

2017 merc 40 4 stroke, motor runs only for minates then quits, pump up fuel back into motor and will start again but runs only for a few minates. Thought it was vent on cap and replaced it but motor still won't operate properly. Any ideas ? I've replace the mechanical pump, cleaned all filters, checked electric fuel pump and all of that was ok. Can it be a pressure valve ?

[adrianol]

How you test hight pressure pump? Can you connect it to 12volts to see if works?

[lynneblais]

Great video! The only thing that can be distracting is the background music. I wish music was at a lower volume or none at all. I find it makes the difference between a really awesome video into a ugh one. Background sound has to not distract from what you’re trying to show us folks😁

[wallytavera]

I have a 40 horse Merc and fuel is coming out of the bottom carburetor at the plunger is there a rubber gasket that's in there that might be pushing fuel back out when it is pressurized