yo,
I'm with my buddy, Fred on this one.
There are just too much risks.
Problems in a 91:
And I hate to do this, esp. since JBG is ther SPONSOR on da Zone, but really, JBG did not manufacture it....
Installation, JBG Polyethylene (MTS mfgr) Problems in a 91; "...i bought one of those plastic ones from JBG... it doesnt fit... the skid plate isnt even tightened all the way up (its dangling by the 2.5" long bolts..the tank is too obviously) and the top of the tank was hitting the floor... its not the same size... taller, wider etc... the filler neck doesnt line up nice either.... second problem to keep an eye out for.. the hold downs work loose on the top and eventually the seal for the sending unit slips and when you fill up at the pump it will dump over 1/2 gallon on the ground when it tops off..."
Source: by DcSkater602 (Steve)
& Problems in a 90:
"... had the same exact problems with my plastic tank. I bought mine from JC Whitney. It didn't fit right and after fiddling with and unscrewing the upper harness limiting straps until they were maxed out it fit and then while filling the tank I discovered that there was a crack along the side of the tank about half way up. **** of a thing to discover when you just put close to 15 gallons of gas in your tank and to have it start gushing out instantly. Luckily my garage wasn't far from the gas station so I drove it home spilling gas everywhere. Took it back and siphoned the fuel out, called JC Whitney and they're shipping me a new one free of charge even though they claimed to have never had this complaint before. I think I might sell it though and just buy a new metal one like you had. That or figure out a way to make spacers to make up for the extra height. I guess they had to make the tank larger in order to make up for all of that extra wall thickness, but this is a real headache..." by 5billiondead at FSB
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Next is... altho he says it is "wasnt real hard to do, pretty easy..." look at what he had to do to important structural components
Installation Info, 19 gallon Polyethylene in a 78
"...alright guys, i dont know if yall remember, but the 33 gallon tank hangs down real far , especially on stock suspension components. i know, i know, get a lift, well, thats coming along shortly.
but to the point, i put a 19 gallon poly truck tank in my bronco, it wasnt real hard to do, pretty easy, in fact, if you have the right tools. basically you just cut out the rear most crossmember, shave off probally 3/8 to a half inch of steel on each lower frame rail edge, fab up a new rear most crossmember to accomodate straps, i just used a piece of U-channel that you can get from Home Depot, theres no good steel or scrap yards near the house. bolt that up, put the tank in.
i had to notch a good size piece of the upper frame rail for the filler neck hose to fit, but i reinforced the hole with a piece of 1/4 inch steel flat bar. go to NAPA, they have new fairly flexible filler neck hose for around 17 bucks a foot, part number NAPA #1055.
get that, cut it to fit, i just used my old vent hose, it wasnt that bad. put the tank up there, make sure it will fit. i used from fairly heavy guage galvanized steel straps that my dad found, but you could use any kind of thicker guage hanging strap for the bottom straps. the way the frame got cut, upper straps arent really neccesasy, but im gonna put them in anyway.
it could be a 2 hour job if someone had the right tools, and knew how to use them. i always bend and break saw-zall blades, so it took me longer, plus some of the drill bits i used sucks, which took even more time. but if you had a welder, for the fabbed up crossmember, and a good saw-zall, it wouldnt take long at all. a drill and bolts works fine, but takes slightly longer..."
by 78broncoboy
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But for a Postitive Experience Ryan M said he had no problems w/a JBG Polyethylene (MTS mfgr) Install in an 86