When routing a fuel line between two rigidly mounted fittings the line should

Question

BlackTom AI · Accepted Answer

Rigidly mounted fittings do not move relative to the structure, so the fuel line must accommodate any slight relative movement, thermal expansion, vibration, and installation tolerances. A single intentional bend (or gentle loop) in the line provides necessary flexibility to absorb these forces and prevents transmission of stress directly into the fittings.

Relevant knowledge points and concepts
- Rigid fittings = no movement at attachment points; any motion must be absorbed by the line.
- Bending provides compliance; a straight hard run transmits loads to fittings and causes fatigue.
- Sharp bends or excessive bends are undesirable: maintain appropriate bend radius to avoid kinking and flow restriction.
- Proper routing also includes support clamps and keeping the line clear of abrasion and heat.

Step-by-step reasoning
1) If two fittings are rigidly mounted and the line between them is straight and taut, any relative movement (vibration, thermal growth) imposes bending or axial loads directly at the fitting joints.  
2) These concentrated loads create high stress at the fitting connections, increasing the likelihood of loosening, cracking, or leaks over time.  
3) Introducing at least one smooth bend or a short loop creates a compliant segment that can flex slightly, absorbing motion and reducing stress concentration at the fittings.  
4) That bend must have an appropriate radius—not too sharp—to avoid kinking and not so many bends that flow is restricted or wear increases.

Why the correct answer is correct
Having at least one bend between rigid fittings provides the necessary mechanical compliance to protect fittings from stress and fatigue while maintaining fluid flow integrity. It reduces the chance of leaks and failure at the connection points.

Why other choices would be incorrect (brief)
- A straight run would transfer loads to fittings and promote failure.  
- Excessive bends could kink the line, restrict flow, or increase wear.  
- Relying solely on flexible hose without proper routing and clamps can introduce chafing and unsupported spans.

Conclusion
Therefore the correct answer is: have at least one bend between such fittings.

When routing a fuel line between two rigidly mounted fittings the line shouldSingle choice

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