Fuel pump system
US4672937A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 1986 |
| Grant date | Jun 16, 1987 |
| Priority date | — |
| Expiry date | May 19, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/4807
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel system for maintaining fuel flow when the surface of the pool of fuel in the fuel tank is below a minimum level. The fuel pump system includes a reservoir in the fuel tank and a pump in the reservoir. A motor in the pump drives a first pump which draws fuel from a secondary chamber of the pump and discharges it to the engine. The motor also drives a second pump which draws fuel from the tank through a primary chamber and discharges it to the secondary chamber. The excess of fuel discharged by the second pump over the first pump is discharged through an orifice in the pump to the reservoir. At fuel levels below the minimum, a float controlled solenoid closes an intake port to the primary chamber causing fuel to back-flow through the flow orifice to the secondary chamber to supply the first pump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.