1988 Glasstron

Nutron · Jul 23, 2011

I have a 1988 16' Glastron boat. I am trying to figure out where I can get the size of the fuel tank in the boat, I tried finding it on the side and front of the tank but it is no where to be found. I am mixing fuel and gas now and cannot seem to figure out the size of the fuel tank. Any help would be appreciated.

jayhanig · Jul 23, 2011

Re: 1988 Glasstron

Measure in inches the height X width X length to get cubic inches, then multiply that result by 0.004329 to get US gallons.

Nutron · Jul 23, 2011

Re: 1988 Glasstron

I measured 55 total inches, it came to 0.23. Does that mean it is 23 gallons? Sorry not the best with math.

Texasmark · Jul 24, 2011

Re: 1988 Glasstron

Just another way of saying what Jay said:

From commonly available cross reference tables, 1 US gallon = 231 cubic inches. A cubic inch is as Jay said is length x width x height measured in inches. If you measure the 3 dimensions of your tank in inches merely take that number and divide it by 231. The answer is the gallon capacity. However, you need to leave room for expansion and all so I would then multiply your answer by 0.8 for 80% of capacity and the answer (to me) would be your working capacity.

So, if your tank measured 24" long, by 18" wide, by 12" high then it's volume is 24 x 18 x 12 = 5184 cubic inches. Dividing by 231 (cubic inches per gallon) = 22.44 US gallons. Allowing for expansion multiply by 0.8 = 18 US gallons.

HTH

Mark

jayhanig · Jul 24, 2011

Re: 1988 Glasstron

Nutron said:
I measured 55 total inches, it came to 0.23. Does that mean it is 23 gallons? Sorry not the best with math.

55 cubic inches? Go back and look again. If your gas tank was 2" by 2 - 3/4" by 10 inches, it'd be 55 cubic inches. Your munchkin gas tank would then hold .23 gallons; or almost a quart.

You probably ought to plan on short trips.

V153 · Jul 24, 2011

Re: 1988 Glasstron

I believe 12 gallons was standard and 18 was optional. 'Less it's a CVX then 18 was standard.

Check out Classic Glastron or CGOAMN for more info.

Nutron · Jul 24, 2011

Re: 1988 Glasstron

Ok, so I did this wrong. Multiply not adding, L-26XW-17.5XH-11.5 = 5232.5 / 231 comes to 22.5 gallons. Thanks for the help. So with the expansion talked about, should I mix a full tank with oil to 18 gallons or stay at the 22? Thanks again for the help.

V153 · Jul 24, 2011

Re: 1988 Glasstron

I'd bet that's a 18gal Glastron tank.

Anyway, assuming your mixture is 50:1 it really doesn't matter the size of tank. Just add oil to the fuel accordingly. Say you put 6 gals of fuel in, add 16oz of oil. And so on?

jayhanig · Jul 24, 2011

Re: 1988 Glasstron

Nutron said:
Ok, so I did this wrong. Multiply not adding, L-26XW-17.5XH-11.5 = 5232.5 / 231 comes to 22.5 gallons. Thanks for the help. So with the expansion talked about, should I mix a full tank with oil to 18 gallons or stay at the 22? Thanks again for the help.

That sounds a lot more like it. Doing it my way, I came up with 22.65 gallons, so 22.5 gallons is the magic number. If you fill it full, mix for 22.5; If you're going to mix it with less, you have one more problem to figure out: what are you starting with? If you start with an empty tank, I'd fill it to 20 gallons 1) for simplicities sake, and 2) I just can't see 20 gallons of gas expanding 2.5 gallons on the hottest of days. The American Petroleum Institute suggests on its "Safety In The Home" page:

"Fill container no more than 95 percent full to allow for expansion." - http://www.api.org/ehs/health/home/index.cfm

Filling to 18 gallons is wasting capacity you may want or need some day.

V153 · Jul 24, 2011

Re: 1988 Glasstron

jayhanig said:
Filling to 18 gallons is wasting capacity you may want or need some day.

Agreed. However it bears mention that boat builders of that era seemed to be a lil conservative re hp/speed/capacities etc. For insurance purposes I reckon.

But keep in mind the tank(s) might be mounted fwd & high in the boat. Few inches above the deck/floor in some cases. Which means the fuel filler and the vent ain't a whole lot higher'n the tank in these kinda boats. Sounds like a lil built in 'sloshing' factor'd be alright?

Texasmark · Jul 25, 2011

Re: 1988 Glasstron

Yesssss. That's why I used the reduction factor 0.8 rather than 0.9 or 0.95.

Mark

Maclin · Jul 25, 2011

Re: 1988 Glasstron

I think I would use some separate 5 or 6 gallon plastic fuel cans and mix in those first then pour into the big tank just to be sure I had the ratio the engine can "live" with. (your post says you are mixing fuel and gas but I am assuming you are mixing fuel and oil for a 2cycle).

26aftcab454 · Jul 25, 2011

Re: 1988 Glasstron

OR--bring an extra 6gal of premixed gas in a portable tank--just make sure it is enough!.

V153 · Jul 25, 2011

Re: 1988 Glasstron

Yup! Might not be a bad idea to drain the built in tank while your at it. Find out what kinda crud's inside?

1988 Glasstron

Seaman

Master Chief Petty Officer

Seaman

Supreme Mariner

Master Chief Petty Officer

Lieutenant Commander

Seaman

Lieutenant Commander

Master Chief Petty Officer

Lieutenant Commander

Supreme Mariner

Admiral

Lieutenant Commander

Lieutenant Commander