Mercruiser Gen III Fuel Module

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This video describes how to repair and maintain and mercruiser GEN III cool fuel module. The fuel system was not properly maintained from the previous owner and caused this filter to fail.

[bossboyent]

Nice vid man thanks for sharing I learnt more from this than the previous 10 other users combined

[willytv]

Very good video man - I just bought a Cobalt with a 496 and it has this cooler. So far, I am having no troubles, but I plan to go into it this winter and have a look. I would definitely put some never-seize on those small screws when you put that back together.

[rickrobinson]

How did threading the water inlet/outlet work out. It looks like the walls are awful thin for the threads

[burespeter]

Hi, To prevent water buildup in your fuel tank, keep the tank full of fuel when the boat is not in use. That will prevent condensation on the walls of fuel tank and less water will collect in it.
That will save you a lot of headaches and money. Water in fuel is not bad fuel, but condensation in the tank. I hope that will help. PS: Great job on the broken bolts :o)

[XCXFlashBang]

What is the brass check valve for on the side of the module? Is it to relieve pressure on the water side if it's too high?

[panchohughes]

Helpful video. Thanks for sharing this info. Going thru this same type of issue myself.

[ainstaink]

You should torque M6 SS bolts to about 55-60 in-lbs max! My experience with M8 grade 10.9 going into aluminum...they torque to about 96 in-lbs. 124 in-lbs would break the bolt! Also how did you prime the system? Everyone talks about replacing fuel filters, but then you live the system with quite bit of air in there.

[msgofast]

I had plastic fitting leaking, thing I also see is 2 hoses go into main feed hose side by side, trying to understand how water will flow around when 2 hose next to each other on a supply line?
My cooler blocks up with salt over a yr and fuel block over heats and get vapour lock engine would run when hot.

[benlavold]

How much did he charge to repair the injectors? Do you have a link to the service bulletin for the water fittings?

[gregmahanna]

Great video. What can you do when the fuel line won't come out of the cap after the retaining pin is removed?

[pinksprinkles]

Good advice. It helped me a lot.
Thank you!

[ATKrausz]

Did you replace the small round filter below the main filter?

[itozs]

Hello, great jhob!..What is the manual number? Thanks

[tersch]

how do you remove the fuel module from the boat? i see you took part of the fuel line that goes to the engine with it. Does that not disconnect from the module? Im stuck, thanks!

[vikingman]

That is too much work and it looks like you need new pumps. Also, the main paint peal problem is inside the small filter on top of the unit. You can clean that out. I would just buy a new Gen III box and assembly.