Cool Fuel Gen III delamination 2006 8.1s

Zorba

Zorba

Active Member
May 21, 2008
1,324
East Harbor, Lake Erie
Boat Info
2006 340 Sundancer
Engines
Twin 8.1 Mercruiser
I think i know my fuel issue but want some confirmation. I dealt with it last year in the hopes i could change my plugs and get peak performance again as usual, but alas at the plug change still could not make WOT RPM (4100 is best i could do) and still had some significant trans rattle indicative of a miss. Soooo, what is everyone's experience getting MerCruiser to fess up to the issue and at a minimum discount the replacement unit. I know of all the service bulletin and have heard stories of getting them to replace, but want see if anyone had some practical advice. I'm a realistic person and know we are talking about a 12 year old boat but it cant hurt to ask...

Also what is everyone's source for injectors... part numbers?
 
This won't help you Zorba, but...My 340 had 8.1s with trouble free Gen II Cool Fuel - I'd so love to pick the brain of the engineer that signed off on the CF 3 design. I never had vapor lock troubles with CF2, but I assume other folks must have...Has anyone priced a conversion from CFIII back to CFII?
 
My 2008 failed in 2014. After inspection, it was not delaminated paint but still the same failure and symptoms that the paint causes.

Merc did redesign it and the cf is no longer anything close in design now.
 
paulswagelock said:
My 2008 failed in 2014. After inspection, it was not delaminated paint but still the same failure and symptoms that the paint causes.

Merc did redesign it and the cf is no longer anything close in design now.
Click to expand...
Would like a better explanation of both of these statements
So if it wasn't paint that clogged your injectors, what was it ?
Tell us about the design that is so different.
 
Zorba said:
I think i know my fuel issue but want some confirmation. I dealt with it last year in the hopes i could change my plugs and get peak performance again as usual, but alas at the plug change still could not make WOT RPM (4100 is best i could do) and still had some significant trans rattle indicative of a miss. Soooo, what is everyone's experience getting MerCruiser to fess up to the issue and at a minimum discount the replacement unit. I know of all the service bulletin and have heard stories of getting them to replace, but want see if anyone had some practical advice. I'm a realistic person and know we are talking about a 12 year old boat but it cant hurt to ask...

Also what is everyone's source for injectors... part numbers?
Click to expand...

Have you changed your plug wires - this was the source of the problem for one of my motors not reaching full rpm.
 
scoflaw said:
Would like a better explanation of both of these statements
So if it wasn't paint that clogged your injectors, what was it ?
Tell us about the design that is so different.
Click to expand...
Boat started acting up out of the blue. Would randomly shut off sounding like fuel starvation. Slowly started losing performance. Eventually died and wouldn't restart and didn't have sufficient fuel pressure at the rail. All the symptoms of paint issues that kill the pump and clog the injectors. Replaced CF module and disassembled. All paint intact inside (but it was sprayed in there). Replaced all injectors and had them cleaned- no paint. So I had all the symptoms of the death by paint, but just ended up it was the fuel modules inside the CF dying, but not from paint.
 
I went volvo penta wires for their version of the 8.1 and they fitted perfectly......I then later picked up spare sets of AC Delco's (exactly what was originally on the motors) from Michegan Motors for about US$50 a set at the time.....so I grabbed 4 sets. Far cheaper than AUD $1,000+ a set the Mercruiser dealers were quoting here in Oz.
 
Last edited:
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