That fuel line is a metric size too... I sorta recall that mine was 10mm , 3/8 worked, but was a bit tight. I am keeping my eye on it for signs of splitting, eight months later, still looks OK, but I would feel more comfortable if it was the correct size. If I wasn't so lazy, I would have hunted down the 10mm stuff and "done it right".

I am not 100% sure on the size, so double check it before you buy the hose!

C/YA!
Jeff
'88 Trooper
2DR LWB 4ZE1 5SP
bone stock DD