Q: Which cars had 18 gallon gas tanks?

A: None of them. The 18 gallon tank is a rumor. All thirdgens have 15.5 gallon tanks.

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1991 Camaro Z28
5.7L 5-Speed
13.32 @ 105.27 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
Webmaster: ICON Motorsports

 

But it cost me $22 to fill my tank!?!?!?!!
Oh yeah, gas is $1.45 & 9/10.

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ASE Master Tech + L1
Savannah, GA
'87 Trans Am-K&N,Cold air induction, SSM SFC, Flowmaster, 16" GTA rims.
'97 Bonneville SSE
About Me

 

Not true. My car has a 16.2 gallon tank. Came stock in '87's at least.

 

Q: Why do some cars have 16.2 gal tanks and others have 15.5 gal tanks?

A: Really, they don't. Both cars have exactly the same physical tank. The difference is in the sending unit. Fuel injected cars have a fuel pump in the tank which takes up some of the "space"... hence why they are rated at 15.5 gal and carbureted cars are rated at 16.2 gal.


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"You live and you learn, or you don't live long"
"Good judgement is often the result of experience. Experience is, unfortunately, often the result of bad judgement."

'84 Black Camaro ZZ4 M5 (V-6 in a former life)- Blown 10-bolt
'99 Navy Blue Metallic Firehawk #120 M6(!CAGS, B&M Ripper, stock POS clutch)

 

Thanks again Ron. I knew what the difference was but I didnt know how to say it.

 

I thought the 1LE cars came with a specially baffled, 18 gal. tank.

 

Specially baffled, yes... there's currently a question as to whether some of the NON 1LE cars got the baffled tank, and which ones got the swinging pickup.

NONE of them had 18 gallon tanks. Sorry to burst that bubble .