More gas

[Rocsaloon]

I have a 1985 offshore pro with a 100 gallon tank I need 50 more, should I add an aux tank or just go for a single 150 gal?

 

[Bloodweiser]

I would ask what the cost differential is between the two options

 

[wrxhoon]

That will also depend on the condition of the 100 gal tank you have now.

 

[seasick]

That will also depend on the condition of the 100 gal tank you have now.

Very much so.

For all the work required, I would go for a bigger tank but do some research about how that would fit and what structural changes might be needed. For example, bulkheads may need to be removed, modified and/or added

 

[SeanC]

2 tanks with separate plumbing and filters is good insurance.

 

[Ky Grady]

I like the option of 2 tanks. 148 total.

 

[seasick]

I see that your filler hoses run in opposite directions. Do you have fill and vents on both and starboard gunnels?

 

[Ky Grady]

If you're talking to me, you need to look closer. Both run same direction, to starboard side gunnel.

 

[ocdansar]

I had a 1985 24 offshore. I went from a single 200 to twin 150’s and added the extra 50 and also put a 20 gallon freshwater tank in that hold also.

 

[Rocsaloon]

I like the option of 2 tanks. 148 total.
View attachment 15808

I went with the 40 gal auxiliary tank, didn't break the bank lol . should get me to everywhere I need to go here in NC

 

[Fishtales]

I like the 2 tanks. One big one could have issues managing the weight distribution when less than full. I'd do the 100 gal tank while there as well.