fuel filler pipes

The illustrations below show the Bullnose filler necks/hoses vs the 1987 & later ones.  But just in case you miss it:

• The Bullnose fillers have the fuel going down the main hose and the vent path is a small (3/4" I think) hose.  This causes fuel pumps to trip off as the fuel can't go into the tank rapidly because the air cannot get out.
• The 1987 & later ones are reversed - fuel goes down a 1" tube and the entire outside hose is the vent path.  This works much better as the air can get out and the pumps don't trip off as quickly.