Fiberglass tank fill issue

Capt. Lou

Lieutenant Commander
Joined
Oct 5, 2011
Posts
183
Likes
50
Location
Martha's Vineyard
Boat Make
40 H&H "Julia G"
I was attempting to screw in a reducer/gauge cap to my corroded tank fill bung. The old fill bung snapped off top of fiberglass tank. I believe it may have been attached using 5200. I am not familiar with the construction of fiberglass tanks but it seems mine had a large access on top and they embedded the fill bung into a square piece of unknown material and then screwed that down to the top of the fiberglass tank with plenty of adhesive and maybe even a coating on top of it. Anyway I was thinking I could just 5200 bung back on. Here are some photos that may help explain. Looking for ideas...thanks

image.jpg
 

Capt. Lou

Lieutenant Commander
Joined
Oct 5, 2011
Posts
183
Likes
50
Location
Martha's Vineyard
Boat Make
40 H&H "Julia G"
And what I was trying to achieve was a visible gauge. Not sure I like the clear cover but I couldn't keep the screw in kind of hatch because there wasn't any Clarence above the cap

image.jpg
 

Blitzen

Admiral
Joined
Sep 1, 2011
Posts
5,832
Likes
6,417
Location
Sumday Isle, RI
Boat Make
Flowers Boat Works 46 hull #1, Flowers Boat Works 36 hull #1, Wayne Beal 28 Hull #1, Repco 30 1968,
Here is one thought, if the pad or fiberglass is thick enough to get a few threads into it, clean up the opening and tap the top of the tank for the proper size nipple and then use a reducer and bushing to reduce it to the size of your gauge. And don't forget the proper joint compound for gas/diesel
 
Last edited:

traditions

Rear Admiral
Joined
Oct 9, 2011
Posts
1,671
Likes
1,006
Location
mid coast maine, muscle ridge channel
Boat Make
38 Holland
That tank doesn't very thick.I would get a thick piece of glass,tap it with a 1 1/2 pipe tap,screw a 1 1/2 to 1 1/4 reducer into it and fasten it the same way the other one is.By using the reducer you have a set of good threads to screw some thing into.
 

tunaorlater

Admiral
Joined
Sep 9, 2011
Posts
5,295
Likes
4,215
Boat Make
40' Northern bay
I would clean both surfaces very good and epoxy it back on.
 

ToemanDoug

Ensign
Joined
May 21, 2012
Posts
14
Likes
0
Capt. Lou, would you mind sharing some info about the gauge you have there? Brand, source of supply, anything to point me in the right direction.

I have been loking for a mechanical in tank gauge like that, but google has not been my friend.

Thanks, in advance.
 
Last edited:

El Mar

Admiral
Lite User
Joined
Sep 1, 2011
Posts
7,835
Likes
4,019
Location
Westbrook, CT (The Asshole State)
First Name
Bryan
Boat Make
43 Tiara Open DDEC, GradyWhite 226, 18 Donzi Classic, 15 Boston Whaler Sport ETec 60

Capt. Lou

Lieutenant Commander
Joined
Oct 5, 2011
Posts
183
Likes
50
Location
Martha's Vineyard
Boat Make
40 H&H "Julia G"
Capt. Lou, would you mind sharing some info about the gauge you have there? Brand, source of supply, anything to point me in the right direction.

I have been loking for a mechanical in tank gauge like that, but google has not been my friend.

Thanks, in advance.

I own gas stations and happened to be looking at a catalog for supplies and noticed they made mechanical gauges for standard 50 gal drum bungs. I have the same bungs as fuel tank tops. You have to specify tank depth when ordering i paid $25/ cap. they took 2 weeks to get. got them from Jme
Krueger Sentry Gauge Type L Gauges - L221

http://http://www.jmesales.com/catalog/productinfo.aspx?id=6118&cid=4325&skuid=KSL221&gclid=CJ-FgoTB1bYCFQsy4AodnxYAZg
 

Capt. Lou

Lieutenant Commander
Joined
Oct 5, 2011
Posts
183
Likes
50
Location
Martha's Vineyard
Boat Make
40 H&H "Julia G"
My solution was I took a 1/4 inch piece of starboard and cut a hole and screwed and 5200 in the reducer cap. I then 4200 the hell out of the starboard plate and placed over old hole and screwed it in. I was thinking of putting a layer of west system over the whole top and painting it white just to clean it up. Will west system be in contact with 4200??
Here are photos:

image.jpg
 

Latest Posts

Top Bottom