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A piping structure for transporting a fuel arranged between an engine and a fuel tank, is constructed by use of a resin tube that is formed in a straight tubular shape. The resin tube is flexed and bent at one or more points along a longitudinal direction of the resin tube to define one or more bent

A piping structure for transporting a fuel arranged between an engine and a fuel tank, is constructed by use of a resin tube that is formed in a straight tubular shape. The resin tube is flexed and bent at one or more points along a longitudinal direction of the resin tube to define one or more bent portions and thereby is provided with a predetermined bent shape. The resin tube is fixed in a motor vehicle body so as to retain the bent portions and thereby assembled in the motor vehicle body.

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1. A resin tube for transporting a fuel to be adapted in a piping structure for transporting a fuel, arranged between an engine and a fuel tank, the piping structure, comprising: a resin tube formed in a straight tubular shape, for transporting a fuel, the resin tube being flexed and bent at one or

1. A resin tube for transporting a fuel to be adapted in a piping structure for transporting a fuel, arranged between an engine and a fuel tank, the piping structure, comprising: a resin tube formed in a straight tubular shape, for transporting a fuel, the resin tube being flexed and bent at one or more points along a longitudinal direction of the resin tube to define one or more bent portions and thereby being provided with a predetermined bent shape, anda fixing clamp for fixing the resin tube in a motor vehicle body so as to retain the one or more bent portions and thereby assembling the resin tube in the motor vehicle body,the resin tube, comprising:a small diameter resin tube body with an outer diameter up to 6 mm, andan elastic clamped layer laminated on an outer peripheral surface of the resin tube body to be clamped by the fixing clamp, the elastic clamped layer having a predetermined wall thickness and covering the resin tube body along an entire effective length of the resin tube that effects flexing deformationwherein the resin tube is to be connected with a mating pipe via a connector, the connector including a tubular nipple portion as a fit-in portion for being fitted in the resin tube, the tubular nipple portion being provided with an annular sealing member on an outer peripheral surface of the tubular nipple portion, andwherein the clamped layer is removed for predetermined length from an extremity of the resin tube body so as to expose an end portion of the resin tube body, and an end portion of the clamped layer being located to overlie an annular rib of the tubular nipple portion near a leading end of the tubular nipple portion via the resin tube body when the resin tube is fitted on the tubular nipple portion of the connector. 2. The resin tube for transporting a fuel as set forth in claim 1, wherein the clamped layer is formed with wall-thickness in a range of 0.7 to 1.3 mm. 3. The resin tube for transporting a fuel as set forth in claim 1, wherein an end portion of the clamped layer is removed for a length of 2 to 8 mm from the extremity of the resin tube body. 4. The resin tube for transporting a fuel to be adapted in the piping structure for transporting a fuel as set forth in claim 1, wherein the end portion of the clamped layer is removed so as not to cover a portion of the resin tube body to be flared by a flaring jig for fitting the resin tube on the nipple portion of the connector. 5. A resin tube for transporting a fuel to be adapted in a piping structure for transporting a fuel, arranged between an engine and a fuel tank, the piping structure, comprising: a resin tube formed in a straight tubular shape, for transporting a fuel, the resin tube being flexed and bent at one or more points along a longitudinal direction of the resin tube to define one or more bent portions and thereby being provided with a predetermined bent shape, anda fixing clamp for fixing the resin tube in a motor vehicle body so as to retain the one or more bent portions and thereby assembling the resin tube in the motor vehicle body,wherein a mark is provided on an outer peripheral surface of the resin tube, along a generally entire length of the resin tube, the mark extends linearly in a longitudinal direction of the resin tube in a state that the resin tube extends straight. 6. The resin tube for transporting a fuel as set forth in claim 5, wherein the resin tube has a small outer diameter up to 6 mm. 7. The resin tube for transporting a fuel as set forth in claim 5, wherein the resin tube is connected with a mating pipe via a connector, and the connector is configured to be sealed relative to a mating pipe by an annular sealing member and configured to be rotatable relative to the mating pipe. 8. The resin tube for transporting a fuel as set forth in claim 5, wherein a connector is attached to an end portion of the resin tube for connecting the resin tube with a mating pipe, and the connector is provided with a checker member for verifying complete connection with the mating pipe, wherein the mark is provided on the resin tube so as to correspond to a mounting and removing direction of the checker member or a mounting and removing side of the checker member relative to a circumferential position, or correspond to a diametrically opposite side to the mounting and removing direction of the checker member or the mounting and removing side of the checker member relative to a circumferential position. 9. The resin tube for transporting a fuel as set forth in claim 5, wherein a connector is attached to an end portion of the resin tube for connecting the resin tube with a mating pipe, the connector is provided with a retainer for engaging with the mating pipe, the retainer has an operating portion that does not project radially from the connector, the operating portion is configured so as to cancel engagement of the mating pipe with the connector or with the retainer by being operated, wherein the mark is provided on the resin tube so as to correspond to the operating portion or an operating direction of the operating portion relative to a circumferential position. 10. A resin tube for transporting a fuel to be adapted in a piping structure for transporting a fuel, arranged between an engine and a fuel tank, the piping structure comprising: a resin tube formed in a straight tubular shape, for transporting a fuel, the resin tube being flexed and bent at one or more points along a longitudinal direction of the resin tube to define one or more bent portions and thereby being provided with a predetermined bent shape,a fixing clamp for fixing the resin tube in a motor vehicle body so as to retain the one or more bent portions and thereby assembling the resin tube in the motor vehicle body, anda connector attached to an end portion of the resin tube for connecting the resin tube with a mating pipe,wherein the resin tube is adapted to be assembled in the motor vehicle body while the tube is connected with the mating pipe via the connector,wherein the fixing clamp retains the one or more bent portions of the resin tube by fixing a region on each side of the one or more bent portions of the resin tube in the motor vehicle body,wherein the fixing clamp has a resilient holding portion of generally annular shape, and an opening through which the resin tube is adapted to be fitted in the holding portion in a direction perpendicular to an axis while resiliently widening the opening,wherein the fixing clamp is constructed such that the opening is closed when the fixing clamp is fixed in the motor vehicle body while holding the resin tube in the holding portion, andwherein the resilient holding portion is adapted for holding the resin tube fitted in the fixing clamp via the buffer member, the buffer member including a cylindrical portion, flange portions on either end of the cylindrical portion, and a buffer member opening in a predetermined circumferential position of the buffer member, for receiving the resin tube in the buffer member. 11. The resin tube for transporting a fuel to be adapted in the piping structure for transporting a fuel as set forth in claim 10, wherein the resin tube has a small outer diameter up to 6 mm. 12. The resin tube for transporting a fuel to be adapted in the piping structure for transporting a fuel as set forth in claim 10, wherein the mating pipe is integrally formed in a component that is securely fixed in the motor vehicle body. 13. The resin tube for transporting a fuel to be adapted in the piping structure for transporting a fuel as set forth in claim 10, wherein the engine is connected to a rear wheel so as to fluctuate along with the rear wheel. 14. The resin tube for transporting a fuel to be adapted in the piping structure for transporting a fuel as set forth in claim 10 wherein the connector has; a) a connector body in a form of a cylindrical shape as a whole, including a retainer holding portion on one end of the connector body along an axial direction and a connecting portion on the other end of the connector body for being connected to the resin tube,b) a retainer held in or on the retainer holding portion for engaging with a pipe side engaging portion in a form of a projection or recess on an outer peripheral surface of the mating pipe, and at a position spaced apart from an axial end of an inserting end portion of the mating pipe,c) a sealing member placed inside the other end of the connector body relative to the retainer holding portion,wherein the retainer securely fixes the mating pipe that is inserted in the connector body in an axial direction, the sealing member contacts with an outer peripheral surface of the inserting end portion of the mating pipe that is inserted in the connector body to provide a seal relative to the inserting end portion thereof. 15. The resin tube for transporting a fuel to be adapted in the piping structure for transporting a fuel as set forth in claim 14 wherein the retainer holding portion is in a form of a socket shape, and the connecting portion is configured as a force-fit portion to be force fitted inside the resin tube. 16. A resin tube for transporting a fuel to be adapted in a piping structure for transporting a fuel, arranged between an engine and a fuel tank, the piping structure, comprising: a resin tube formed in a straight tubular shape, for transporting a fuel, the resin tube being flexed and bent at one or more points along a longitudinal direction of the resin tube to define one or more bent portions and thereby being provided with a predetermined bent shape, anda fixing clamp for fixing the resin tube in a motor vehicle body so as to retain the one or more bent portions and thereby assembling the resin tube in the motor vehicle body,the resin tube, comprising:a small diameter resin tube body with an outer diameter up to 6 mm, andan elastic clamped layer laminated on an outer peripheral surface of the resin tube body to be clamped by the fixing clamp, the elastic clamped layer having a predetermined wall thickness and covering the resin tube body along an entire effective length of the resin tube that effects flexing deformationwherein the resin tube is to be connected with a mating pipe via a connector, the connector including a tubular nipple portion as a fit-in portion for being fitted in the resin tube, the tubular nipple portion being provided with an annular sealing member on an outer peripheral surface of the tubular nipple portion, andwherein the clamped layer is removed for predetermined length from an extremity of the resin tube body so as to expose an end portion of the resin tube body, and an extremity of the clamped layer being to be located on an axially middle position of the nipple portion when the resin tube is fitted on the nipple portion of the connector.