HOW IT WORKS

The amount of fuel entering the fuel bowl is regulated by the distance the fuel inlet needle is raised off its seat and by fuel pump pressure. Movement of the fuel inlet needle in relation to the seat is controlled by the float and lever assembly which rises and falls with the fuel level. When the fuel in the fuel bowl reaches a pre-set level, the float lowers the fuel inlet needle to a position where it restricts the flow of fuel, admitting only enough fuel to replace that being used.

An integral retaining clip is attached to the fuel inlet needle assembly. The clip hooks over the tag on the end of the lever of the float assembly. This clip assures reaction of the fuel inlet needle to any downward movement of the float. Downward movement of the float (or float drop) is controlled by adjustment of the tab end of the float lever.

A wire-type retainer prevents movement of the float shaft within the guides on each side of the fuel bowl. The retainer fits into a groove on the outside of the fuel inlet needle seat. The ends of the retainer are hooked over grooves on opposite ends of the float shaft. The fuel bowl is internally vented into the air cleaner.

FITTINGS AND FILTERS

This is one of several 2100 fuel inlet types. This one has a 1/2" inlet. Uses a brass fitting 90-10 with a gasket, then a 30-91 fuel filter. The fitting has an inverted flare. The fuel filter fits against this and does not use a gasket. This would be typical of 1958-1963 carburetors.

INSTALLING FLOAT RETAINER

The float retainer in the Motorcraft 2100 carburetor, also sometimes referred to as the float pin retainer, serves a straightforward yet essential purpose: it holds the float hinge pin in place. The float hinge pin is what the float pivots on within the carburetor's float bowl.

Here's a bit more about its function:

1. Holding the Float Hinge Pin: The float inside the carburetor's float bowl moves up and down with the level of fuel. This movement controls the needle and seat mechanism, which in turn regulates the amount of fuel entering the float bowl. The float must pivot smoothly on its hinge pin for accurate fuel level control.
2. Preventing Movement: Without the float retainer, the hinge pin could potentially move out of its proper position, which could interfere with the float's operation or even allow the float to become dislodged. A misaligned or dislodged float can result in fuel flooding or starvation, leading to engine running issues.
3. Installation: When rebuilding or servicing the carburetor, it's crucial to ensure that the float retainer is properly positioned and in good condition. A damaged or missing retainer can lead to the aforementioned problems.

While it's a small component, the float retainer plays an essential role in maintaining the correct function of the carburetor's fuel control system. When working on or rebuilding a Motorcraft 2100, it's always a good idea to ensure that all components, big or small, are in their proper place and in good working condition.

Installing a **float retainer** on a Motorcraft 2 barrel 2100 or 2150 carburetor.

https://youtu.be/-KhVSa38jBA?si=eVDrax3Y0bneIOc2

TROUBLESHOOTING AND Q&A

What Does The Float Spring Do?

Question:

I have a damper spring on my float pivot rod. Currently it is oriented with the short side under the float hinge and the long side against the back of the float bowl (behind the needle) ...in effect putting slight up pressure on the float. The spring is in its natural state, i.e. not wound around giving more tension. Is this correct?

Answer:

The spring is used to keep the float from bouncing. A small amount of tension is desirable. If it is flopping around then wind it one turn. From what you describe you have it in the right position.

Red valve