Regarding OEM parts, vans produced from 08/1983 through 01/1987 used FPD #23270-52011 which was replaced by #23207-16020 which is now NLA. Vans produced from 02/1987 through 07/1988 used FPD #23270-73010 which was replaced by #23270-50012 which according to www.toyotapartsdeal.com is currently still available.

All of the above listed part numbers are physically interchangeable. The only difference with them is the pressures at which they are meant to operate. The only thing that controls pressure (other than max output of fuel pump) is the Fuel Pressure Regulator. Toyota recognized the need to increase pressure in the 1988 models and along with the higher output FPR's came the new FPD's . If you want to keep it all Toyota, you could upgrade to the 88-89 FPR and the 88-89 FPD, then both would be matched and the van would have slightly less tendency to exhibit heat soak issues.

Of course I've see people intermix these parts, and although it's not something I would recommend, things still seem to still function okay. With these vans getting older and parts drying up we'll all eventually be forced to use aftermarket parts and/or adapt things that didn't originally belong. Good luck! Tim