Fuel System Information & Restoration
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Second Generation Camaro Owners Group Fuel System Information & Restoration |
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Fuel System General Information
Quick and dirty overview. Keep in mind, this is a system... all the parts are designed to work together to supply fuel to the carb.
Carburetor
Only the highest performing 396 and the Z28 (until 1973) used a Holley carb. They look
racey and are easily tunable. All other 4 barrel applications used a quadrajet carb (in
various CFM's). Low performance applications used a 2 barrel carb, while the 6 cylinder came
with a 1 barrel carb.
Specific Carb usage is contained in the engine specific sections.
Throttle Bore:
L6 - 1.69, 307 - 1.44, L65 - 1.69
Qjet: 1.38 (primary), 2.25 (secondary)
Holley throttle bore was 1.69
Fuel pump
All Camaro fuel pumps were mechanical. They're pushrod driven off a lobe on the cam. They pull
gas from the tank and push it up to the carb. Typical performance is 4-5 PSI at the pump outlet for
the L6 engine and 7.5 to 9 PSI for V8 applications.
Gas Tank
From 1970 to 1973 the Camaro used a 19 gallon (approx.) tank, or an
18 gallon (with EEC) gas tank. In 1974 the size was increased to 21
gallons.
Fuel Lines
Low performance cars used 5/16" supply lines. Performance cars used 3/8" supply lines.
Some cars required a return line. Some cars also had a vent line.
Air Cleaner assembly
The ONLY Camaro to have an open element air cleaner was the 1973 Z28 and 1970 L34 396.
All other cars (including Z28's) had some form of snorkle(s) on the air cleaner assembly.
Fuel System Restoration
If you've modified your engine you will often times require more fuel to burn, which means you'll
need to upgrade your fuel system if your car can't supply enough gas in stock configuration.
You may do this by using other components from a car/engine which produced similar results that
you're now after (i.e. 360hp Z28), or by using aftermarket parts. These issues
are dealt with in the performance section of the site.
This section will deal with putting your system back together correctly using the original parts.
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