The lines connect, on my 1980s 740s, at the upper rear of the tank. Accessible from under the car, or via an access panel in the trunk/back seat somewhere (I have seen the panel from below but have not attempted to access it from above). The connection at the tank is a simple push-on hose over nipple with a hose clamp. To fit a larger hose, you will probably need an adapter, or sometimes I have had good luck making a sort of "sleeve" for the nipple by forcing a piece of appropriate size nylon tubing over it. I assume all this is the same on your 1990 wagon, though I cannot say for sure... someone else on here was just saying the other day that the fuel tank and filler setup changed in the late 1980s so yours may be different from mine. I have only ever worked with 1986 and older diesels so cannot speak to any late-production differences...
Why are you increasing the hose size?
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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