Evaporative Emissions Control System for Walk Behind Lawnmowers 2007-32-0053
This paper discusses an evaporative emissions control system which significantly reduces diurnal evaporative emissions in walk behind lawnmower engines equipped with float carburetors. The system also maintains engine startability, run quality, and a simplistic user interface. The system consists of low-permeation fuel line and a multi-layer fuel tank using an EVOH barrier as well as a carbon canister integrated in the lawnmower's push-handle and an Automatic Bowl Drain System (ABDS). A prototype of the system resulted in a 90% reduction in diurnal evaporative emissions when compared to a pre-regulation walk behind lawnmower using the CARB TP-902 sealed housing for evaporative determination test. This paper demonstrates a practical solution to reduce diurnal evaporative emissions and hydrocarbon running losses below the level emitted from a state of the art, float carbureted, walk behind lawnmower engine.
Author(s):
Andrew Bejcek
Affiliated:
Walbro Engine Management, LLC
Pages: 7
Event:
Small Engine Technology Conference & Exposition
Related Topics:
Fuel lines
Fuel tanks
Lawn vehicles and equipment
SAE MOBILUS
Subscribers can view annotate, and download all of SAE's content.
Learn More »