US 4,063,540 AGranted

Method and apparatus for fuel recovery in internal combustion engines

AssigneeFiat Societa per Azioni

InventorAntonino Pace

Life of this patent

Estimating the term…

Loading patent…

Abstract

Apparatus and method for recovering fuel from the induction system of an internal combustion engine having a carburetor, comprising one or a plurality of collectors along the fuel path between the carburetor throttle valve and the inlet valves of the engine, the collectors being in the form of annular recesses in the walls of the ducts, which recesses act to trap fuel which flows back as a liquid condensed onto the inlet manifold pipes as a reaction to the closure of the associated inlet valve of the engine. Each collector is connected by a drainage systems of conduits via expansion tanks and a pump, to the petrol tank of the engine and/or to the inlet to the carburetor whereby fuel which condenses prior to being drawn into the engine can be recycled for vaporization thereby avoiding its entry into the engine as a liquid.

Claims4

Dependent claims

A fuel recovery device for a carburetor of an internal combustionengine comprising a down draft type carburetor having at least one vertical axis barrel, an intake manifold having a plurality of pipes adapted to be connected said engine, a fuel collector disposed between said carburetor at the lower end of each barrel and said intake manifold for collecting fuel condensed in each barrel, expansion chamber means, first conduit means connected between each collector and said expansion chamber means for directing the collected fuel from each collector to said expansion chamber means, second conduit means connected to said expansion chamber means and said pipes for returning vapors from said collected fuel to said pipes and third conduit means leading from said expansion chamber means for returning said fuel for reuse, each collector comprising an annular groove at the lower end of each barrel defined by upper and lower coaxial frusto-conical walls with said lower wall being inclined to the vertical axis of the barrel by an angle in the region of 45.degree. to 60.degree. and said upper wall being inclined to the vertical axis of said barrel by an angle in the region of 10.degree. to 20.degree..

Dependencies are inferred from the claim text.