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Author Topic:   6.6 gallon fuel tanks & fuel storage
PMUCCIOLO posted 03-24-2002 03:10 AM ET (US)   Profile for PMUCCIOLO  
I need your advice...I had an 18-gallon Pate fuel tank installed under the rear seat on my 17' Alert. I still have the two 6.6 gallon Yamaha OEM tanks, but will use them infrequently (if at all).

It is my understanding that the tanks should be stored full of fuel (to prevent condensation), but I have pre-mix (fuel and oil) in mine for the motor's break-in. Does this adversely affect the situation?

Is there some sort of fuel stabilizer to add? If so, how often should I cycle the fuel in the tanks?

The tanks are stored in my garage, which is well ventilated, so that's not an issue.
If anyone is interested, I'll strongly consider selling them. I have no idea what they're worth. Let me know.


whalerron posted 03-24-2002 11:43 PM ET (US)     Profile for whalerron  Send Email to whalerron     
According to Chevron Oil, you need to put gasoline stabilizer in the tank at the same time you buy the fuel. This is because the "lights" in the fuel begin to evaporate immediately. The "lights" are the additives that make engines easy to start when they are cold. Chevron has a pretty interesting writeup on this subject on their webpage.
Bigshot posted 03-25-2002 10:12 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
The problem is the gas will go to crap. Without gas the tanks will rust inside. With Sta-bil it will not gum up etc but will lose octane...quickly. You will never use them again unless doing a long trip but in an alert, you will most likely be inshore near gas.

Selling them causes an issue, can't ship. They will not ship used tanks.

whalerron posted 03-25-2002 02:10 PM ET (US)     Profile for whalerron  Send Email to whalerron     
You make a good point about octane loss. For this reason, it is important to buy a good fuel stabilizer.

According to this paper available from the Minnesota Department of Agriculture, gasolines loses octane because of oxidation. (If I remember correctly, oxygenated fuels are even more susceptible to this oxidation process. ) But, good gasoline stabilizers contain anti-oxidants which prevent the loss of octane. The use of a Stabilizer should keep the gas good as new:

As for running an engine dry, I had always done this in the past but I have read that this is not a good practice. Even if you do manage to keep everything lubed in a 2 stroke as the engine goes to running on a single cylinder, you can not get all of the gas out of the system. Unless you disassemble everything and blow out all of the fuel lines and ports, there will be some old gas waiting around to give you grief later.

Bigshot posted 03-25-2002 02:14 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Problem is and is going to be the vent will have to remain open. You will get evaporation and oxidation no matter what. The oil will not eveaporate and therefore change ratios, etc. I would run the gas out and sell them locally and not have to worry about the 2 bombs in your shed. Maybe your deal;er will trade you some $$ towards your 20 hour service for them, etc. I bet they are $60 new each.
whalerron posted 03-25-2002 05:40 PM ET (US)     Profile for whalerron  Send Email to whalerron     
Why do the tank vents need to remain open? On the 6 gallon steel tanks, whether I have 1 gallon or 6 in the can, I have no problem with expansion or with the tank collapsing. With a 12, I wouldn't expect expansion to be a problem but do they crush themselves because of contraction?

- ron

whalerron posted 03-25-2002 05:42 PM ET (US)     Profile for whalerron  Send Email to whalerron     
Whoa! I just replied to the wrong thread. Scratch that last comment! Oh, that was bad!
PMUCCIOLO posted 03-26-2002 01:32 AM ET (US)     Profile for PMUCCIOLO    
Thanks for the input. I'll probably wind up selling them locally.


madhur_101 posted 09-01-2005 09:16 AM ET (US)     Profile for madhur_101  Send Email to madhur_101     
can you tell that keeping the gasoline in storage leads to the loss of octane ? If yes than after how much time it losses its octane rating (10 days , 1 month or more)

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