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Huh, thats weird, send a simple pic of side of truck. I may try to modify.
The problem with the earlier trucks was that the filler neck angle was just too sharp at the top.
This has been a complaint since this body style was introduced in 1973. I was working at a gas station pumping gas and everyone was howling about how they couldn't fill their trucks except at a trickle. The problem with the earlier trucks was that the filler neck angle was just too sharp at the top. Gas nozzles wouldn't even fit all the way in. This is more of a problem here in California with the stupid rubber cone on the pump nozzles. If they aren't compressed, no gas. So, like said earlier, either turn the nozzle upside down or shove a funnel in the neck and hold the rubber cone up with your hand. I have this same problem with my 1968 Firebird when I fuel up.