The Hot Idle Compensator is used on some carburetors to offset enriching effects caused by percolation during hot operation. Generally used on vehicles with air conditioning. When the engine is running hot and then stopped, the fuel can boil or percolate and vaporize causing a rich condition at idle. The…
Accelerator Pump Adjustment A – Rich B – Lean C – Leaner The Weber marine carburetor accelerator pump lever has 3 holes. The standard position is to have the rod in the 1st (A) hole. If you are experiencing a bogging down on acceleration try placing the rod in hole…
A lawsuit has been filed in the United States District Court in New Jersey against Subaru of America, Inc. (“Subaru”) and Fuji Heavy Industries, Ltd. What is the suit about? The suit alleges that certain Subaru vehicles suffer from a design defect that causes them to consume excessive amounts of engine…
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…
Classic cars are not the best match for today’s ethanol enhanced gasoline. If you use it in many of the older models, be prepared for earlier component failures. Most automotive parts wear out over time, but ethanol speeds up the deterioration of many, especially those made of rubber or cork….
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…
Here is an interesting story from one of my customers. We were discussing some of the problems he was having with his Motorcraft 4300 and shared his story with me. These 4300s did run for some people, at least a mile or two off the lot. When the carb didn’t…
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…
Gas is leaking out of the main throttle shaft, or gas is coming out of the top vents, or you get black smoke while idling. All of these are indications of too much gas, or flooding. Here is a list of possible causes in no order of importance. Most float…
by John Klyzek How do you tell someone what size something is? What diameter is that hole? How long is that part? What we are really doing is comparing the size of the item in question to some known or agreed upon standard. What is the standard? Is there more…