Fuel capacity

[Trent1124]

Hello I have a 1993 Astro S18FS, it is the fish and ski model with a 150 on it. I have been struggling since I bought this boat to understand why I can only fill the tank when empty to 15 gallons. My tank is stamped to hold 25 gal. Any help is appreciated!

 

[Alumarine]

Hi and welcome.
Are you sure it's empty when you are trying to fill it?
It could be the gauge.

 

[Bondo]

Ayuh,..... Or the angle of the boat in regards to where the fill enters the tank,....

Welcome Aboard,.....

 

[UP HOOKER]

Is it an Aluminum tank or plastic? I saw a plastic tank once that was foamed in and actually was distorted kind of crushed down.

 

[82rude]

Maybe the tank was replaced at one point.

 

[chuser]

Did you run the engine all the way to empty? Until it quit? Maybe the gauge isn't showing the accurate fuel level. I know mine doesn't, it reports empty when I've still got a quarter tank or more.

 

[KevenF324]

May be you have fuel on your tank , that's why u cant fill more than 15 gal...... make the tank empty first than try it or your tank originally made for 15 gal not 25 gal

 

[pddgm]

Also make sure the tank vent hose is not clogged or pinched off. I built inboard jet bass boats for a while and it had a 36 gal tank that was tricky to fill until we figured out the vent was in the wrong place on the hull...