# US 4,394,925 A · Fuel tank-filler pipe particularly for motor vehicles

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- Number: US 4,394,925 A
- Document ID: US4394925A
- Status: Granted
- Kind: A
- Application number: 06/268,452
- Filed: 1981-05-29
- Granted: 1983-07-26
- Earliest claimed: 1981-05-29
- Assignees: Ford Motor Company
- Inventors: Egon Rump; Wolfgang Franzen
- Web page: https://patentgrep.com/patent/US4394925A

## CPC

- B60K 15/04: Tank inlets (B60K15/077 takes precedence)
- Y10T 137/86324: Tank with gas vent and inlet or outlet
- Y10T 137/86332: Vent and inlet or outlet in unitary mounting
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A fuel tank-filler neck is provided for avoiding the return of fuel from a fuel tank during the filling process. The fuel tank-filler neck is adapted to be disposed sloping upwards from the fuel tank at an oblique angle and comprises a filler pipe having an air vent in a lower portion of the filler pipe adapted to the disposed within the fuel tank; a mouth at the upper end of said filler pipe adapted to receive a fuel pump nozzle; a Venturi-type neck of reduced diameter extending the aforesaid lower portion of the filler pipe below the air vent; and an air vent pipe extending within the filler pipe from the mouth to the air vent.

## Claims

### Claim 1

A fuel tank-filler neck for avoiding the return of fuel from a fuel tank during the filling process, said fuel tank-filler neck being adapted to be disposed sloping upwards from said fuel tank at an oblique angle, comprising a filler pipe, an air vent being provided in a lower portion of said filler pipe adapted to be disposed within said fuel tank; a mouth at an upper end of said filler pipe adapted to receive a fuel pump nozzle; a Venturi-type neck of reduced diameter extending said lower portion of said filler pipe below said air vent; and an air vent pipe extending within said filler pipe from said mouth to said air vent in said lower portion of said filler pipe.

### Claim 2 (depends on 1)

The fuel tank-filler neck according to claim 1 wherein said Venturi-type neck is unitary with said filler pipe.

### Claim 3 (depends on 1)

The fuel tank-filler neck according to claim 1 wherein said Venturi-type neck comprises plastic, is non-unitary with said filler pipe and is attached to said filler pipe below said air vent.

### Claim 4 (depends on 3)

The fuel tank-filler neck of claim 3 wherein said Venturi-type neck has axial slots and is clamped flexibly onto said filler pipe.

### Claim 5 (depends on 3)

The fuel tank-filler neck of claim 3 wherein said filler pipe further comprises a locking bolt in said lower portion and said Venturi-type neck has a bayonet slot adapted to be locked positively onto said locking bolt.