Tuesday Tech Question for 1/31/12:

Question:

I have a mechanical fuel pump that keeps the bowls of my carburetor full and a return line that takes excess fuel back to the tank.  My racing buddies say that I need a fuel shut off valve in the main fuel line to the carburetor, is this true?

Fuel Pump Joe

Answer:

Fuel Pump Joe,

Yes it is.  In the 2012 NHRA Rulebook General Regulations, section 20, page 5, Pumps/Valves it states “Cars equipped with carburetor(s) or non-electronic fuel (EFI) systems but with mechanical non-OEM fuel pumps must have a quick-action fuel shutoff valve within easy reach of driver and located in the main fuel line between fuel tank and carburetor and/or injectors.”