Patent US4516547A successfully refreshed from Google Patents.
US4516547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel supply system
Assignee: ZF International UK Ltd
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Filing: 1983-07-19
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Granted: 1985-05-14
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Expires: 2003-07-19
Abstract
Abstract A fuel supply system for an internal combustion engine includes a fuel pump which draws fuel from a supply tank. A subsidiary fuel tank receives fuel from the supply by way of a conduit which incorporates a one way valve. The inlet of the pump is connected to a pipe which extends to adjacent the lower wall of the subsidiary tank. The subsidiary tank can be pressurized with air to force fuel towards the pump and a safety valve is fitted to the subsidiary tank to limit the pressure build up therein.
Inventors
- 👤 Derek Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:06
CPC Classifications
F; F02; F02M; F02M37/00; F02M37/04; F02M37/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
125 words
A fuel supply system for an internal combustion engine comprising a fuel delivery unit through which fuel can be supplied to an associated engine, a fuel supply pump for supplying fuel to the delivery unit, a supply tank from which fuel in use is drawn by the supply pump, a subsidiary fuel tank, a conduit through which said subsidiary fuel tank can be supplied with fuel from the supply tank, a one way valve in said conduit, said one way valve acting to prevent the flow of fuel from the subsidiary fuel tank to the supply tank and a further conduit through which said subsidiary fuel tank can be pressurized with air to force fuel from the subsidiary fuel tank towards said fuel delivery unit.
Claim 2
Dependent Claim
125 words
A fuel supply system for an internal combustion engine comprising a fuel delivery unit through which fuel can be supplied to an associated engine, a fuel supply pump for supplying fuel to the delivery unit, a supply tank from which fuel in use is drawn by the supply pump, a subsidiary fuel tank, a conduit through which said subsidiary fuel tank can be supplied with fuel from the supply tank, a one way valve in said conduit, said one way valve acting to prevent the flow of fuel from the subsidiary fuel tank to the supply tank and a further conduit through which said subsidiary fuel tank can be pressurized with air to force fuel from the subsidiary fuel tank towards said fuel delivery unit.
Claim 3
Dependent Claim
23 words
A system according to claim 1 including a safety valve for limiting the pressure which can be attained in the subsidiary fuel tank.
Claim 4
Dependent Claim
32 words
A system according to claim 1 or claim 2 in which said subsidiary fuel tank is positioned so that fuel can flow through said first mentioned conduit under the action of gravity.
Claim 5
Dependent Claim
19 words
A system according to claim 3 in which said subsidiary fuel tank is located partly within said supply tank.
Claim 6
Dependent Claim
44 words
A system according to claim 1 or claim 2 in which said subsidiary fuel tank is disposed above said supply tank, said subsidiary fuel tank having a fuel inlet whereby the tank can be filled with fuel, and a cap for sealing said inlet.
References Cited (Backward Citations)
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Cited
US3450116A
Cited
US4030453A
Cited
US3987774A
Cited
US4031864A
Cited
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |