Quote:
Originally Posted by best view
Did not know that the factory dual fuel tank was a locked door in 1970 thought that was aftermarket
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Good eye. N18 is the mid-70 model year predecessor to the NL2 option folks are more familiar with in 71-72. Interestingly, have seen only a few pics ever related to N18, one showed it with an NL2-style cap in the REAR bedside, and the factory documentation I have shows it with the flapper doors like this 70 (and I'm not 100% certain the documentation I have is N18-specific, but it is dtd May 70 and is GM documentation on saddle tank installs). Dealers could also install aftermarket vendor saddle tanks, but this truck has the N18 RPO as you've highlighted, so it arrived from the factory with the predecessor to the NL2. You may find some more useful discussion on N18
here and
here.