Yeah, it's originally a non-return system, so the gas cap is correct.
I couldn't find a decent non-return line pump, so I picked up a Delphi unit (all others were Spectra or some other off brand) Ames has them as well as the other sites, but I was on RockAuto at the time and just grabbed it.
The one on the car now is about 12 years old, but not many miles on it and was a Carter unit. Works fine, but was doing a timing cover reseal and decided to replace it while I was in there.
