Floats perform an important function in maintaining the correct level of fuel in the float bowl by opening and closing an internal inlet valve. If the float develops a leak, it will sink below its ideal level and excess fuel will enter the bowl. This causes the engine to run rich and probably causes leakage of gasoline out of the carburetor, increasing the risk of engine fires. In a carburetor rebuild be certain to examine the old float for damage or corrosion. You can also test your float for leakage to determine if it needs to be replaced. Repairing old floats is difficult, especially in light of the need to avoid increasing the weight of the float with the addition of solder. Adding weight changes the floatation characteristics of the float.

We have one of the Internet’s widest selections of floats including all floats that remain available and many that are extremely hard to find. We have floats for all of the major name brands of carburetors. These floats are made in the U.S.A. and designed and built to the highest quality standards, including both brass and nitrophyl floats. In some applications, both are available to choose between. We do recommend changing all old nitrophyl floats at the time of a carburetor rebuild, and many mechanics change all floats during rebuilds.

From Holley, Carter, and Motorcraft to Stromberg and Zenith floats, we have them all, including a wide selection of Rochester and Marvel Schebler floats. If it is time for a float replacement in your classic car, scroll our selection and find your carburetor float at a price that will make you smile.

Float Problems and Their Diagnosis:

With brass floats, the floating “pontoon” is typically constructed of at least two brass sections soldered together along a seam. Then a tiny hole used to equalize internal and external temperatures is soldered shut to complete the assembly process. Since all of these points are submerged in gasoline during engine operation, leakage problems can later occur at any place that was soldered. Repairing these floats is quite challenging and replacement is usually preferred unless the float is no longer available.

If your engine is the least bit hard starting after it has warmed up, or if your exhaust has a rich gasoline odor, you probably have carburetor problems, and a bad float is one of the possibilities. Other symptoms include poor gas mileage and, of course, if the engine is flooding.

Is Ethanol Good for my Car?

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.

Older cars with rubber fuel lines are especially vulnerable. A failed rubber fuel line can result in an engine fire. Who needs that? But the fuel line constitutes the most easily addressed area of concern. Other components that are frequently damaged by ethanol include carburetor float valves, rubber accelerator pumps, pump diaphragms and die-cast carburetor bodies, rubber fuel pump diaphragms, galvanized fuel lines and fuel tanks, and gaskets made of either cork or rubber.

Because of its deleterious effects, ethanol rated as E85 (which is only 15 percent gasoline and 85 percent ethanol) should be avoided at all costs. But even the smaller 10 percent ethanol rated E10 will deteriorate components far faster than pure gasoline. Ethanol also attracts moisture, so use a quality fuel stabilizer to help control water retention.

Of course, if you can avoid ethanol altogether, that is your best option. Today there are not many places where you can get ethanol-free gas, but it behooves you to look for them. If you are lucky enough to have a local supplier, seize the opportunity for your car’s sake.

If ethanol cannot be avoided, then make regular fuel system inspections your new standard operating procedure. If your car does not have to retain its stock condition, it is a good idea to install an inline fuel filter so inspection of your gas is easier. Monitor this and the fuel bowl for traces of cork or rubber. If you see either, you already have trouble.

Also inspect the carburetor, both internally and externally. Look for signs of fuel leaks or residue of cork or rubber in the fuel. Check for loosened bolts from weakening gaskets. Check the needle valve. Its replacement may be required much more frequently than in the old days.

Unless the car is driven quite infrequently, regular monthly inspections of your fuel system should be performed and rubber components should be considered for replacement annually.

Of course, if your classic does not have to remain stock, your options increase dramatically. There are now stainless steel fuel tanks available, as well as stainless fuel lines, and they are completely trouble-free in relation to ethanol. There are also replacement carburetors that are impervious to ethanol problems, so if you drive a car that does not have to remain original, these replacements should solve your fuel-related problems for good.

Ethanol and classic cars are not good bedfellows. But a careful regular inspection regimen and timely replacement of key parts can make the relationship at least livable.