« Last post by jim shula on May 20, 2016, 09:36:57 AM »
Do you have vertical space to run a flat 2x between the stringers and flush with their tops? I'd do this and then double up the 2x in the space between the tank and the stringer. Cover the 2x with an appropriate cushioning material like 1/4" neoprene rubber. Leave clearance to allow for 5% expansion. Don't make them tight to the tank. Put a piece of 2x between the stringers at each end as well.
What are the two indentations about halfway up the tank? Do they go all the way through the tank$
« Last post by BobC on May 20, 2016, 07:21:24 AM »
Yep, you can strap it down and in many cases that would be preferred method as it still allows for expansion/contraction between the straps. Nylon will last a decent amount of time of kept out of the UV but stainless is forever!
« Last post by film842 on May 20, 2016, 06:41:30 AM »
Don't know why the pictures didn't post but here's another try. As you can see it's a plastic tank. BobC...after reading your post I got the impression that I could essentially strap the tank down (with appropriate hold downs) as opposed to building something structural around it? I like that idea although I wonder about the long term life of straps.
« Last post by BobC on May 20, 2016, 06:20:58 AM »
You don't mention what material the tank is made of. If it is plastic, you will need to allow room for expansion. Other than that it really doesn't matter what material you fill the gap with. Some guys secure them with some nylon or stainless straps. It could be done as simply as gluing some blocks of wood to the stringers at intervals. With plastic tanks, the gasket around the sending gauge and fuel/vent inlet and outlet can be subject to deteriorating and leaking after time due to the constant expansion/contraction of the materials. Best to have an inspection port at this location.
If the tank is made of aluminum. I would not use anything that could trap moisture against the aluminum as this will cause corrosion. Once again you can use some blocks of wood that are epoxy/glass covered glued to stringers to hold it in place. UHMW plastic strips or HDPE or even some peices of PEX pipe will also work to hold it in place, will not wear a hole in the aluminum and will not retain moisture against the aluminum. Don't use foam or a dissimilar metal.