Are aftermarket blazer tanks smaller than stock???

[67ChevyRedneck]

Just curious. Last weekend I was a little low on fuel and was sitting at a light to make a left into the gas station when the motor started dying. I thought, oh crap, she's about to run out! No joke, I actually made it to the pumps and it died. That was close! It was definitely out too, when I went to restart it after, I had to pump it for about 10 seconds.

Anyway, I tapped the tank for the heck of it, sounded pretty hollow, so I filled 'er up. I even went so far as to fill it up, let it settle then stuff it full, and I only managed to get 18.2 gallons in it.

I thought blazer/burb tanks were all 21 gallons. I can understand that the pick-up unit can't get all the gas out, but 3 gallons worth left?

Anyone else think they have a "small" blazer tank?

The tank has the correct blazer/burb sending unit.

The tank was a repop I bought off a board member about 2 years ago, I have no idea where he got it from.

Just curious

I did do a search

http://67-72chevytrucks.com/vboard/s...r+tank+gallons

http://67-72chevytrucks.com/vboard/s...r+tank+gallons