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Fuel tank size 1985 29 Sedan Flybridge
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tundrarules
#1 Posted : Friday, March 18, 2011 9:33:29 AM(UTC)
tundrarules

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I assumed I have a 100 fuel gallon tank. All the ones like mine for sale are listed as having a 100 gallon tank.

First time I've run my tank close to empty for winter layup. Filled up (ouch) for dewinterization a few days ago and pump shut off at 70 gallons. Either my gauge is wrong or I have about a 75 gallon tank.

Anyone know what size fuel tank I have?Think







1985 Marinette 29 Sedan bridge
Twin 318s, 660 hours
New Edelbrock 1409 carbs (working like a charm)
Original Electronic Ignition, Blaster 2 coils, 90 deg plug wire universal kit cut to fit
Raw water system
Freshwater always
Located Pickwick Lake, TN,MS,AL

RETRO BOATS ARE COOL

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BCassedy
#2 Posted : Friday, March 18, 2011 10:30:57 AM(UTC)
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I don't know about a 29' BigM but here's how you could compute the capacity of your tank:

Length in feet x Width in feet x Height in feet = Cubic feet dimension

Cubic feet dimension / 7.47 = gallons

Bill
Bill & Sharon Cassedy
" Sunset Seeker "
1988 32' Fly Bridge
Twin 318 Cu In / 240HP Chrysler power plants
Raw water cooling
Freshwater boat
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Barkleydave
#3 Posted : Friday, March 18, 2011 11:14:16 AM(UTC)
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Specs of my 87 29 FB Sedan state 100 gal for twin and 75 gal for single.

My twin the tag on the tanks states: 96 gal.

dave
None
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cap'n Brent
#4 Posted : Saturday, March 19, 2011 12:03:20 AM(UTC)
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I would say a 96 gal tank would be advertised as a 100 gal using the round up theory if your a good captain you know not to plan a trip thinking you have a 100 gal to USE. 1/3 OUT 1/3 BACK and 1/3 for wind,current, mishaps. So 100 gal 103 or96 is a mute point with addition that your pick up tube is not all the way at the bottom of the tank to prevent pick up of trash off the bottom. 25 gal at the bottom of a 100 gal tank isn't gonna look like much.
HP Chadwick bay Sunset Bay lake Erie NY boat name Sunrise 32' f/b fisherman chry 318 twin blue bastards,28'express singel 318
"It would be a labor of love, if I loved to labor" cpt Brent
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tundrarules
#5 Posted : Saturday, March 19, 2011 9:17:27 AM(UTC)
tundrarules

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It would be interesting to know how much unusable fuel is in our 100 gal tank. May even say it in our manual somewhere.

Guess one could measure pickup tube and tank and use formula to figure it out exactly. Think




1985 Marinette 29 Sedan bridge
Twin 318s, 660 hours
New Edelbrock 1409 carbs (working like a charm)
Original Electronic Ignition, Blaster 2 coils, 90 deg plug wire universal kit cut to fit
Raw water system
Freshwater always
Located Pickwick Lake, TN,MS,AL

RETRO BOATS ARE COOL

If the guys on this forum take their time to help you, have the courtesy to update your thread with the resolution.
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mark klusman
#6 Posted : Saturday, March 19, 2011 12:00:45 PM(UTC)
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Heres a question on my tank. On my twin, 28ft. which pickup quites first, port or starboard? 100 gal. i guess or real close.
Mark

No matter where you go,there you are.
Knot Normal
28FT. Express
Twin 318's
Ten Mile Tn.




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tundrarules
#7 Posted : Wednesday, April 27, 2011 5:01:12 PM(UTC)
tundrarules

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Measured tank at 17x17.5x60 which says my tank is a 75 gal tank (confusing because I have twins, and someone said twins are 100 gal). Assuming the pickup tube is 1 inch off the bottom (not sure), that would mean my tank has 5 gallons of unusable fuel (or water).

Tank calculator

BigM


1985 Marinette 29 Sedan bridge
Twin 318s, 660 hours
New Edelbrock 1409 carbs (working like a charm)
Original Electronic Ignition, Blaster 2 coils, 90 deg plug wire universal kit cut to fit
Raw water system
Freshwater always
Located Pickwick Lake, TN,MS,AL

RETRO BOATS ARE COOL

If the guys on this forum take their time to help you, have the courtesy to update your thread with the resolution.
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MikeM
#8 Posted : Wednesday, April 27, 2011 8:44:13 PM(UTC)
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My 28 sportsman with twin 318's has a 75 gallon tank as well. Except for filling it I sure wish it had a larger one. I have looked at either adding another or removing that one and going bigger haven't decided yet. Any suggestions?
1988 28' sportsman
twin 318 chrysler
14x11 nibral
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