Merc cool fuel module

J

JAYROCK

Member
Joined
Sep 18, 2007
RO Number
28607
Messages
272
Those who have worked on these know that they are water cooled. Mine is leaking water since removing it to replace fuel pumps. Can't buy just the seals! You have to buy the hose assembly! Can I bypass the cooling lines alltogether? Will it affect anything? The temps here are cool. Thanks Jay
 
you can rebuild it, i think the O rings are the same as injector O rings try a auto parts place for replacement O rings (for the fuel lines) I take them apart and soak in muratic acid for a few minuets that copper cooler will look like new! rinse it well and if it was in salt the salt will turn white and you can wipe it off .make sure to blow it out good inside the fuel cooler so no water gets in the fuel
 
Thanks Guys. I found that the plastic ends that plug into the module are bad. Cant just buy the ends. Have to buy the whole hose assembly. Can I run without the water cooling lines? Will it hurt anything?
 
I don't see why you could not bypass it - the coolfuel is simply to cool the fuel in the fuel lines in an attempt to prevent vapor lock. Depending on how your boat/ER is setup, vapor lock might not even be an issue.
 
billy is right i think they caused more harm and leaks than good i have seen several deleated without any vaporlock issues
 
Call MerCruiser and explain the issue. The design of this unit was flawed. They knew it and issued a service bulletin to dealers. I found out about this bulletin thru a friend. I called Customer Service and sobbed (new unit quite expensive). They offered to pay for a new cooler and 1/2 of the labor to have an authorized mechanic install. I was surprised and quite satisified.
 
I wonder if the cooler is also cooling the pump on the Merc device as on some Crusader models that have the pump inside the FCC cooler. The Merc may not. The were 1 or 2 reports here of successive fuel pumps burning out when it eventually proved the cooler RW flow was blocked with corrosion.

Here's the Merc bulletin for the Cool Fuel connections : http://www.mercruiserparts.com/bulletins/001/04//2009/EN_01.PDF
 
I am going to bypass it this weekend and go for a ride! We have a 140 mile trip next weekend. Want to shake it down before then!Thanks for all the help!
 
davefin is correct. I found out about the service bulletin. I believe if you are within 4 years you are covered under warranty.
 
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