US4683864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel routing systems for fuel-injected engines
Assignee: Walbro Corp
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Filing: 1985-04-11
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Granted: 1987-08-04
•
Expires: 2005-04-11
Abstract
Abstract Fuel routing apparatus for use with fuel-injected engines is provided. In accordance with certain of its aspects, the apparatus automatically recycles fuel to the vehicle's engine when the fuel stream from the vehicle's storage tank is interrupted. In accordance with other aspects, the apparatus provides automatic hydraulic switching between fuel tanks for multiple fuel tank vehicles. In certain preferred embodiments, the apparatus includes a replaceable fuel filter and provides automatic bleeding of entrained air from the fuel stream which is delivered to the vehicle's engine.
Inventors
- 👤 George H. Bucci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:53
CPC Classifications
F; F02; F02M; F02M37/00; F02M37/0011; F02M37/0023; F02M37/0047; F02M37/0052; F02M37/0076; F02M37/0088; F02M37/20; F02M55/00; F02M55/007; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/2567; Y10T137/2569; Y10T137/4673
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
555 words
Fuel routing apparatus for use with a fuel delivery system which supplies fuel to an engine, said system including first and second fuel storage tanks, first and second low pressure pumps for withdrawing fuel from the first and second storage tanks, respectively, and a high pressure pump or supplying fuel to the engine, said apparatus comprising: (a) first and second feed ports for receiving fuel from the first and second low pressure pumps, respectively; (b) an engine feed port for delivering fuel to the high pressure pump; (c) an engine return port for receiving fuel returned from the engine; (d) first and second return ports for returning fuel to the first and second fuel storage tanks, respectively; and (e) hydraulically operated valve means having a first position in which the first feed port is connected to the engine feed port and the first return port is connected to the engine return port and a second position in which the second feed port is connected to the engine feed port and the second return port is connected to the engine return port, said means being responsive to the hydraulic pressures produced by the first and second low pressure pumps such that the means is in its first position when the first low pressure pump is supplying fuel to the first feed port and the second low pressure pump is not supplying fuel to the second feed port, and is in its second position when the second low pressure pump is supplying fuel to the second feed port and the first low pressure pump is not supplying fuel to the first feed port, said hydraulically operated valve means comprising: (i) a first two-position valve connecting the first feed port to the engine feed port when the valve is in its first position, and connecting the second feed port to the engine feed port when the valve is in its second position; (ii) a second two-position valve connecting the first return port to the engine return port when the valve is in its first position, and connecting the second return port to the engine return port when the valve is in its second position; and (iii) a chamber separated into first and second portions by a diaphragm which is moveable between first and second positions corresponding to the first and second positions of the hydraulically operated valve means, said diaphragm being connected to said first and second two-position valves, the first and second two-position valves being in their first position when the diaphragm is in its first position and being in their second position when the diaphragm is in its second position, the first portion of the chamber being connected to the first feed port and the second portion of the chamber being connected to the second feed port so that the first portion fills with fuel and moves the diaphragm to its first position when the first low pressure pump is supplying fuel to the first feed port and the second low pressure pump is not supplying fuel to the second feed port, and the second portion fills with fuel and moves the diaphragm to its second position when the second low pressure pump is supplying fuel to the second feed port and the first low pressure pump is not supplying fuel to the first feed port.
Claim 2
Dependent Claim
555 words
Fuel routing apparatus for use with a fuel delivery system which supplies fuel to an engine, said system including first and second fuel storage tanks, first and second low pressure pumps for withdrawing fuel from the first and second storage tanks, respectively, and a high pressure pump or supplying fuel to the engine, said apparatus comprising: (a) first and second feed ports for receiving fuel from the first and second low pressure pumps, respectively; (b) an engine feed port for delivering fuel to the high pressure pump; (c) an engine return port for receiving fuel returned from the engine; (d) first and second return ports for returning fuel to the first and second fuel storage tanks, respectively; and (e) hydraulically operated valve means having a first position in which the first feed port is connected to the engine feed port and the first return port is connected to the engine return port and a second position in which the second feed port is connected to the engine feed port and the second return port is connected to the engine return port, said means being responsive to the hydraulic pressures produced by the first and second low pressure pumps such that the means is in its first position when the first low pressure pump is supplying fuel to the first feed port and the second low pressure pump is not supplying fuel to the second feed port, and is in its second position when the second low pressure pump is supplying fuel to the second feed port and the first low pressure pump is not supplying fuel to the first feed port, said hydraulically operated valve means comprising: (i) a first two-position valve connecting the first feed port to the engine feed port when the valve is in its first position, and connecting the second feed port to the engine feed port when the valve is in its second position; (ii) a second two-position valve connecting the first return port to the engine return port when the valve is in its first position, and connecting the second return port to the engine return port when the valve is in its second position; and (iii) a chamber separated into first and second portions by a diaphragm which is moveable between first and second positions corresponding to the first and second positions of the hydraulically operated valve means, said diaphragm being connected to said first and second two-position valves, the first and second two-position valves being in their first position when the diaphragm is in its first position and being in their second position when the diaphragm is in its second position, the first portion of the chamber being connected to the first feed port and the second portion of the chamber being connected to the second feed port so that the first portion fills with fuel and moves the diaphragm to its first position when the first low pressure pump is supplying fuel to the first feed port and the second low pressure pump is not supplying fuel to the second feed port, and the second portion fills with fuel and moves the diaphragm to its second position when the second low pressure pump is supplying fuel to the second feed port and the first low pressure pump is not supplying fuel to the first feed port.
Claim 3
Dependent Claim
26 words
The fuel routing apparatus of claim 1 wherein said hydraulically operated valve means includes detent means for defining the first and second positions of said diaphragm.
Claim 4
Dependent Claim
143 words
The fuel routing apparatus of claim 1 further including: (a) a reservoir connected to said engine feed port, said feed port being connected to said reservoir when said hydraulically operated valve means is in its first position, and said second feed port being connected to said reservoir when said hydraulically operated valve means is in its second position; and (b) a valve connecting the engine return port to the reservoir, said valve being closed when the pressure difference between the pressure of the fuel in the engine return port and the pressure of the fuel in the reservoir is below a predetermined value, and said valve being open when said pressure difference is above the predetermined value, the fuel returning through the engine return port being recycled to the engine through the reservoir and the engine feed port when the valve is open.
Claim 5
Dependent Claim
39 words
The fuel routing apparatus of claim 3 further including a bleed tube connecting the reservoir to the engine return port for removing entrained air from the fuel being delivered to the high pressure pump through the engine feed port.
Claim 6
Dependent Claim
31 words
The fuel routing apparatus of claim 3 wherein the reservoir includes a filter for filtering the fuel before it is delivered to the high pressure pump through the engine feed port.
Claim 7
Dependent Claim
88 words
The fuel routing apparatus of claim 5 wherein the reservoir includes first and second portions, the first portion being removable from the second portion for replacement of the filter, and wherein the first and second feed ports are connected to the reservoir by a common port and said common port includes a valve which is closed when neither the first nor the second low pressure pumps is in operation so as to prevent siphoning of fuel from either of the two storage tanks during replacement of the filter.
Claim 8
Dependent Claim
526 words
Fuel routing apparatus for use with a fuel delivery system which supplies fuel to an engine, said system including first and second fuel storage tanks, first and second low pressure pumps for withdrawing fuel from the first and second storage tanks, respectively, and a high pressure pump for supplying fuel to the engine, said apparatus comprising: (a) first and second feed ports for receiving fuel from the first and second low pressure pumps, respectively; (b) an engine feed port for delivering fuel to the high pressure pump; (c) an engine return port for receiving fuel returned from the engine; (d) first and second return ports for returning fuel to the first and second fuel storage tanks, respectively; (e) a reservoir connected to said engine feed port; (f) a filter within the reservoir for filtering the fuel before it is delivered to the high pressure pump through the engine feed port; (g) a bleed tube connecting the reservoir to the engine return port for removing entrained air from the fuel being delivered to the high pressure pump through the engine feed port; (h) a first two-position valve connecting the first feed port to the reservoir when the valve is in its first position, and connecting the second feed port to the reservoir when the valve is in its second position; (i) a second two-position valve connecting the first return port to the engine return port when the valve is in its first position, and connecting the second return port to the engine return port when the valve is in its second position; (j) a chamber separated into first and second portions by a diaphragm which is moveable between first and second positions, said diaphragm being connected to said first and second two-position valves, the first and second two-position valves being in their first position when the diaphragm is in its first position and being in their second position when the diaphragm is in its second position, the first portion of the chamber being connected to the first feed port and the second portion of the chamber being connected to the second feed port so that the first portion fills with fuel and moves the diaphragm to its first position when the first low pressure pump is supplying fuel to the first feed port and the second low pressure pump is not supplying fuel to the second feed port, and the second portion fills with fuel and moves the diaphragm to its second position when the second low pressure pump is supplying fuel to the second feed port and the first low pressure pump is not supplying fuel to the first feed port; and (k) a valve connecting the engine return port to the reservoir, said valve being closed when the pressure difference between the pressure of the fuel in the engine return port and the pressure of the fuel in the reservoir is below a predetermined value, and said valve being open when said pressure difference is above the predetermined value, the fuel returning through the engine return port being recycled to the engine through the reservoir and the engine feed port when the valve is open.
Claim 9
Dependent Claim
526 words
Fuel routing apparatus for use with a fuel delivery system which supplies fuel to an engine, said system including first and second fuel storage tanks, first and second low pressure pumps for withdrawing fuel from the first and second storage tanks, respectively, and a high pressure pump for supplying fuel to the engine, said apparatus comprising: (a) first and second feed ports for receiving fuel from the first and second low pressure pumps, respectively; (b) an engine feed port for delivering fuel to the high pressure pump; (c) an engine return port for receiving fuel returned from the engine; (d) first and second return ports for returning fuel to the first and second fuel storage tanks, respectively; (e) a reservoir connected to said engine feed port; (f) a filter within the reservoir for filtering the fuel before it is delivered to the high pressure pump through the engine feed port; (g) a bleed tube connecting the reservoir to the engine return port for removing entrained air from the fuel being delivered to the high pressure pump through the engine feed port; (h) a first two-position valve connecting the first feed port to the reservoir when the valve is in its first position, and connecting the second feed port to the reservoir when the valve is in its second position; (i) a second two-position valve connecting the first return port to the engine return port when the valve is in its first position, and connecting the second return port to the engine return port when the valve is in its second position; (j) a chamber separated into first and second portions by a diaphragm which is moveable between first and second positions, said diaphragm being connected to said first and second two-position valves, the first and second two-position valves being in their first position when the diaphragm is in its first position and being in their second position when the diaphragm is in its second position, the first portion of the chamber being connected to the first feed port and the second portion of the chamber being connected to the second feed port so that the first portion fills with fuel and moves the diaphragm to its first position when the first low pressure pump is supplying fuel to the first feed port and the second low pressure pump is not supplying fuel to the second feed port, and the second portion fills with fuel and moves the diaphragm to its second position when the second low pressure pump is supplying fuel to the second feed port and the first low pressure pump is not supplying fuel to the first feed port; and (k) a valve connecting the engine return port to the reservoir, said valve being closed when the pressure difference between the pressure of the fuel in the engine return port and the pressure of the fuel in the reservoir is below a predetermined value, and said valve being open when said pressure difference is above the predetermined value, the fuel returning through the engine return port being recycled to the engine through the reservoir and the engine feed port when the valve is open.
Claim 10
Dependent Claim
20 words
The fuel routing apparatus of claim 7 including detent means which define the first and second positions of said diaphragm.
Claim 11
Dependent Claim
85 words
The fuel routing apparatus of claim 8 wherein the reservoir includes first and second portions, the first portion being removable from the second portion for replacement of the filter, and wherein the first and second feed ports are connected to the reservoir by a common port and said common port includes a valve which is closed when neither the first nor the second low pressure pump is in operation so as to prevent siphoning of fuel from the storage tanks during replacement of the filter.
Claim 12
Dependent Claim
521 words
Fuel routing apparatus for use with a fuel delivery system which supplies fuel to an engine, said system including first and second fuel storage tanks and first and second pumps for withdrawing fuel from the first and second storage tanks, respectively, said apparatus comprising: (a) first and second feed ports for receiving fuel from the first and second pumps, respectively; (b) an engine feed port for delivering fuel to the engine; (c) an engine return port for receiving fuel returned from the engine. (d) first and second return ports for returning fuel to the first and second fuel storage tanks, respectively; and (e) hydraulically operated valve means having a first position in which the first feed port is connected to the engine feed port and the first return port is connected to the engine return port and a second position in which the second feed port is connected to the engine feed port and the second return port is connected to the engine return port, said means being responsive to the hydraulic pressures produced by the first and second pumps such that the means is in its first position when the first pump is supplying fuel to the first feed port and the second pump is not supplying fuel to the second feed port, and is in its second position when the second pump is supplying fuel to the second feed port and the first pump is not supplying fuel to the first feed port, said hydraulically operated valve means comprising: (i) a first two-position valve connecting the first feed port to the engine feed port when the valve is in its first position, and connecting the second feed port to the engine feed port when the valve is in its second position; (ii) a second two-position valve connecting the first return port to the engine return port when the valve is in its first position, and connecting the second return port to the engine return port when the valve is in its second position; and (iii) a chamber separated into first and second portions by a diaphragm which is moveable between first and second positions corresponding to the first and second positions of the hydraulically operated valve means, said diaphragm being connected to said first and second two-position valves, the first and second two-position valves being in their first position when the diaphragm is in its first position and being in their second position when the diaphragm is in its second position, the first portion of the chamber being connected to the first feed port and the second portion of the chamber being connected to the second feed port so that the first portion fills with fuel and moves the diaphragm to its first position when the first pump is supplying fuel to the first feed port and the second pump is not supplying fuel to the second feed port, and the second portion fills with fuel and moves the diaphragm to its second position when the second pump is supplying fuel to the second feed port and the first pump is not supplying fuel to the first feed port.
Claim 13
Dependent Claim
521 words
Fuel routing apparatus for use with a fuel delivery system which supplies fuel to an engine, said system including first and second fuel storage tanks and first and second pumps for withdrawing fuel from the first and second storage tanks, respectively, said apparatus comprising: (a) first and second feed ports for receiving fuel from the first and second pumps, respectively; (b) an engine feed port for delivering fuel to the engine; (c) an engine return port for receiving fuel returned from the engine. (d) first and second return ports for returning fuel to the first and second fuel storage tanks, respectively; and (e) hydraulically operated valve means having a first position in which the first feed port is connected to the engine feed port and the first return port is connected to the engine return port and a second position in which the second feed port is connected to the engine feed port and the second return port is connected to the engine return port, said means being responsive to the hydraulic pressures produced by the first and second pumps such that the means is in its first position when the first pump is supplying fuel to the first feed port and the second pump is not supplying fuel to the second feed port, and is in its second position when the second pump is supplying fuel to the second feed port and the first pump is not supplying fuel to the first feed port, said hydraulically operated valve means comprising: (i) a first two-position valve connecting the first feed port to the engine feed port when the valve is in its first position, and connecting the second feed port to the engine feed port when the valve is in its second position; (ii) a second two-position valve connecting the first return port to the engine return port when the valve is in its first position, and connecting the second return port to the engine return port when the valve is in its second position; and (iii) a chamber separated into first and second portions by a diaphragm which is moveable between first and second positions corresponding to the first and second positions of the hydraulically operated valve means, said diaphragm being connected to said first and second two-position valves, the first and second two-position valves being in their first position when the diaphragm is in its first position and being in their second position when the diaphragm is in its second position, the first portion of the chamber being connected to the first feed port and the second portion of the chamber being connected to the second feed port so that the first portion fills with fuel and moves the diaphragm to its first position when the first pump is supplying fuel to the first feed port and the second pump is not supplying fuel to the second feed port, and the second portion fills with fuel and moves the diaphragm to its second position when the second pump is supplying fuel to the second feed port and the first pump is not supplying fuel to the first feed port.
Claim 14
Dependent Claim
26 words
The fuel routing apparatus of claim 10 wherein said hydraulically operated valve means includes detent means for defining the first and second positions of said diaphragm.
References Cited (Backward Citations)
US1849702A
Cited
US1854317A
Cited
US1858291A
Cited
US2417215A
Cited
US2768640A
Cited
US3633605A
Cited
US3658081A
Cited
US4287908A
Cited
US4303089A
Cited
US4386625A
Cited
US4502453A
Cited
US4550691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |