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  Do I need to replace my fiberglass fuel tank?

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Author Topic:   Do I need to replace my fiberglass fuel tank?
thunderpaste posted 01-25-2009 11:35 PM ET (US)   Profile for thunderpaste   Send Email to thunderpaste  
I just bought an 88 Montauk with a brand new E-tec 90 and a fiberglass fuel tank. I know Ethanol blended fuel is widely available here (New Orleans)but have not looked around yet for non-blended fuel.

Should I consider switching to an aluminum or plastic tank? I have a high quality fuel filter on board. Will this protect me from damaging my motor at least until I can replace the tank?

koaman posted 01-26-2009 12:02 AM ET (US)     Profile for koaman  Send Email to koaman     
You are best off finding and using efree or nonethanol fuel, you will get better mileage and preformance. Use a plastic tank if you have to use the Ethanol blended fuel. I don't think the filter will do much good and it definatly won't help ruining the fiberglass fuel tank. What did you pay for the Montauk if you don't mind me asking, I have been looking to buy one for a little while now.
koaman posted 01-26-2009 12:02 AM ET (US)     Profile for koaman  Send Email to koaman     
You are best off finding and using efree or nonethanol fuel, you will get better mileage and preformance. Use a plastic tank if you have to use the Ethanol blended fuel. I don't think the filter will do much good and it definatly won't help ruining the fiberglass fuel tank. What did you pay for the Montauk if you don't mind me asking, I have been looking to buy one for a little while now.
koaman posted 01-26-2009 12:02 AM ET (US)     Profile for koaman  Send Email to koaman     
You are best off finding and using efree or nonethanol fuel, you will get better mileage and preformance. Use a plastic tank if you have to use the Ethanol blended fuel. I don't think the filter will do much good and it definatly won't help ruining the fiberglass fuel tank. What did you pay for the Montauk if you don't mind me asking, I have been looking to buy one for a little while now.
wezie posted 01-26-2009 07:08 AM ET (US)     Profile for wezie  Send Email to wezie     
I would replace it. Begin planning to replace it.
Search for fiberglass and alcohol problems and you will find many very ugly problems that you do not want with your E-tech. The alcohol dissolves the fiberglass and the engine cannot process this stuff.
One more cost of the alcohol, and you may or may not be notified of alcohol in your fuel.
Good Luck!
crabby posted 01-26-2009 07:37 PM ET (US)     Profile for crabby  Send Email to crabby     
I still had my original Pate fiberglass tank (circa 1985) when I repowered with a new 90hp E-Tec in 2004. After several problems with my new motor I decided to not take further chances (in NY state we had already switched to EtOH blended fuel in 2004) and replaced the tank. Before I trashed the tank (no takers either here or on Craigslist) I opened it up and there was a huge "ball" of coagulated "stuff". I realize this is an anecdotal story of what I experienced and does not explain or prove anything, but after having replaced all of my fuel components on my previous engine (1986 70hp Evinrude) due to what I presume to have been EtOH poisoning (soft rubber fuel lines, mushy fuel pump diaphragm) I can report that I have not experienced any problems since then with my current motor that I can directly attribute to either EtOH blended gas or my deteriorated fiberglass tank. I use (since 1985) a cheapo spin-on fuel filter.

My opinion: get rid of it. EtOH in your gas is going to be a reality no matter where you live in the USA (eventually).

thunderpaste posted 01-26-2009 08:26 PM ET (US)     Profile for thunderpaste  Send Email to thunderpaste     
Thanks for the info everyone. I am going to have an aluminum tank fabricated and got a ballpark estimate of $300 for a 30 gallon tank. I'll probably have it powdercoated too.

I paid $11,500 for the Montauk. It is in good condition and the motor is immaculate. A good buff and some teak sanding and treatment and it should be looking pretty sharp. I also plan on putting new cushions and a raised teak rear bench with some kind of storage and livewell.


koaman posted 01-26-2009 10:16 PM ET (US)     Profile for koaman  Send Email to koaman     
Sounds like you got a great deal, best of luck with the new ride and post some photos after all the work is done.

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