gas tank mounting question?

I used a 10 speed frame for my bike project. If I mount the tank on the top frame tube it will only be about 1.5" above the engine. Will this be enough clearance or will the gas tank overheat And blow up in my face?

I plan on riding the bike for extended periods like six to eight hours a day with short stops to get the blood circulating back into my legs and backside.

The only other place I can put the tank would be on the rear rack.

I mounted the tank and the shut off valve is just behind the muffler housing, the fuel line is laying against the spark plug boot on top of the valve cover and if I go up in a blaze of glory I'm going to haunt you two guy's the rest of your lives!!!!

Ok here's what I did. I cut a piece of 1.5"PVC pipe into thirds lengthwise about 8" long and taped four pieces to the top frame tube with electrical tape. Then bolted the tank on top of the PVC sections but I had to make longer straps to go under the tank.

This raised the tank a good inch higher. I bought 1/4" chemical injector line for a power washer to use as a new fuel line because I can't find fuel line anywhere around here And I even went to two small engine repair shops, got the line from Tractor Supply store.

The line is taped to the frame tube, its about 1/2"above the valve cover and at least a inch away from the spark plug. I also put a inline fuel filter on the fuel line, the repair shop had the filter but not the fuel line to go with it. Can you beleve this crap. I spent 4.5 hours today running around tring to find this stuff.

Well its starting to rain now that the bike is finally done so I'll have to wait untill tomorrow for the maiden voyage, this damn thing better run or I'm going take a big hammer to.