F36 Tanks

LandVF36 · Post by **LandVF36** » Wed Jul 30, 2008 11:18 pm

Our 73 F36 today only has 2 tanks the flank the engine compartment. They are narrow at the bottom, fat at the top. I've never really paid much attention to how much gas I put in when the guages are at 1/2 or 3/4 to full, so I guess I don't really know what size they are. I can't find any labels. I think they have been replaced before, at least they are painted white on all sides, not normally an orginal feature...

There are also "cradles" between the stringers below the aft deck, one on each size. No tanks there anymore, but the old lines run up to valves mounted below the glass door into the salon / above the aft deck on the bulkhead wall.

So, long lead up to a basic question. Anybody have a guess on the actual tank sizes? Anybody know what tanks the old girl came with? Were 4 tank configurations common? If not, I'll bring a calculator to the boat on Saturday and figure it out.

Mitch

Stripermann2 · Post by **Stripermann2** » Thu Jul 31, 2008 7:50 am

The standard tanks were a total of 250 gallons. 125 each tank.

The rear tanks I believe, gave the additional 100 gallons, 50 each. According to the Trojan manual I have on hand.

LandVF36 · Post by **LandVF36** » Thu Jul 31, 2008 11:05 pm

Thanks for the info. Last weekend we went 30mi downstream on the Mississippi and back the following day. We traveled at around 25 mph down and at about 9 mph back ( but towing a big old Polaris 11' jetski). I went through a little less than a 1/4 tank on each side. If they are 125 a side, then that's about 1 mpg.

Seems bad, but our last boat, a 1978 Chris Craft Catalina with twin 283 did do any better and only went 1/2 as fast anywhere.

If I'd just cruise at hull speed, and not tow anything, I bet it would be around 1.5 mpg.

Hoping to go from Minneapolis to St Louis and back next summer. Guess I need to start saving.

Danny Bailey · Post by **Danny Bailey** » Mon Aug 04, 2008 9:05 pm

The original tanks in my '80 F-36 were 125 gallons each but they were not narrow on the top and fat on the bottom like you say yours are. They leaned outboard...shaped like a parallelegram or 'half crushed rectangle'. If yours are a different shape they may have been replaced sometime and may not be 125 gallons.

Lookout · Post by **Lookout** » Sat Sep 06, 2008 7:03 am

I have an 86 F-36 and it has 2 125 gal tanks foward and 2 50 gal tanks aft. This is as shipped from trojan

LandVF36 · Post by **LandVF36** » Sat Sep 06, 2008 7:31 pm

Thanks for the info. Based on guages and fills, I think I've figured out that they are around 120 gals. They do "tip out", its just that they are wider at the top then the bottom. I burned them down to about 1/4 tank in August, but didn't have the cash on hand to top them off and do the math. The guages between the port and starboard definately read differently through the middle range.

Where were are the deck fills for your read tanks. Out boat has the cradles still for the rear tanks, gas line plumbing and valves, just no deck hardware. Just curious.

Do you also have 2 40 gal round water tanks below the galley and helm floor?

prowlersfish · Post by **prowlersfish** » Sat Sep 06, 2008 10:00 pm

LandVF36 , the fills were right behind the fron fills . the rear tanks were a option , but I would think you had rear tanks if the lines and valve are there . my rear tanks were removed when the diesels where put in the fill holes now have rod holders in them . the stock side tanks as note were 125 gals each..

My Trojan also had the 2 40 gal water tanks in the same place as yours . they have been replace with plastic rectangler thanks .

Lookout · Post by **Lookout** » Mon Sep 08, 2008 5:08 am

Same on mine. Looking at your picture, I can only see one cap. the fills would be about 4 inches to the stern of the port and starboard fills you now have. To be honest, with the fuel prices the way they are, I have my rear tanks dry and have only been using my front tanks. I suppose for long range crusing they would ba handy but I just fish so I dont need to lug around 350 gals of fuel.