• Bobs Carburetor Shop

    Recently I was driving through Oceanside California and a sign on a building caught my attention. “Bob’s Carb’s”. The 1st thing I thought was WOW, you don’t see many carburetor shops these days. I was curious about the business so I turned off and went inside. Hi, My name is…

  • Gas Dripping From Venturi

    Gas dripping from the venturi can happen on most carburetors, but we will talk about the Mercarb and the Rochester 2 Jet, 2 barrel. The only time gas should come out of the venturi is when you pump the gas throttle. That is when an extra squirt of gas is…

  • Idle Mixture Screws – Adjustments and How to Purchase

    The Carburetor Idle Circuit and Adjusting the Idle Mixture GENERAL KNOWLEDGE The idle mixture screws sets the mixture of fuel and air during idle RPM; the idle circuit is in effect only when idling. Once RPM increases above idle, the idle mixture screws are no longer in play. Single barrel…

  • Rochester 2 Jet Fuel Percolation

    Throttle Body Venting I ran across some information about some of the 2 jets that deals with the percolation of gas after shutting off the vehicle. We hear about this problem a lot these days because gas now has a lower boiling point. Percolation means that the gas is boiling…

  • Car Stalls When Putting in Gear

    I was recently asked about a Thunderbird that dies when putting the transmission in drive. This could be caused by a vacuum leak, or possibly it is starving for fuel. Knowing that this particular vehicle has a multitude of vacuum hoses going to the carburetor, I would go with a…

  • Testing the Holley 94 Accelerator Circuit

    When I’m rebuilding my carburetors, I will usually test the accelerator pump circuit before closing up the float bowl. The Holley 94 carburetor uses a check ball in the accelerator pump well and I want to make sure it doesn’t need seating. 1st, you need to know why the check…

  • Holley 1940 Float

    The Holley 1940 carburetor originally used a Nitropyl type of float and because they tend to absorb fuel over time, we recommend that they be replaced at each carburetor rebuild. Once a Nitrophyl float has absorbed fuel it will become too heavy and allow more fuel to enter the bowl…

  • Rochester B, BC 1 Barrel Carburetor Identification

    This carburetor is one of the hardest carburetors to identify when it comes to purchasing rebuild kits. Fortunately there are ways to find the original carburetor number, or worst case and with a little work, you can at least get the correct carburetor kit. Identification. Rochester used a tag attached…

  • Carter WCFB Carburetor Float Circuit

    The purpose of the float circuit  is to maintain an adequate supply of fuel at the proper level in the bowls for use by the low speed, high  speed, pump and choke circuits. Primary and secondary bowls are separated by a partition. The fuel line connections is above the secondary…

  • Replacing Carburetor Expansion Plugs

    Expansion plugs such as the one you might find on the choke housing will sometimes come loose, fall out, or perhaps you just needed to get inside for a good cleaning. The process explained here is for those types of passage ways that have no fuel such as the choke…