What commonly causes an AN fuel line to leak?
Documented on the 1965 Ford Mustang build
Published August 5, 2026
Leaks typically come from loose swivel fittings, damaged or frayed hose, improperly assembled hose ends, or corroded/damaged mating surfaces on AN fittings.
Full Answer
Leaks typically come from loose swivel fittings, damaged or frayed hose, improperly assembled hose ends, or corroded/damaged mating surfaces on AN fittings. Over-tightening or using thread sealant on AN swivel seats can also cause leaks.
Documented In This Build
Related Knowledge
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Related Parts
Fuel hose clamps
$8
Braided AN fuel hose (example -6 AN)
$60
AN swivel fittings / hose end fittings (set)
$40
Fuel-safe rubber hose (temporary or OEM style)
$25
Fuel pressure gauge (diagnostic)
$30
Related Tools
AN wrenches / open-end wrenches
Floor jack and jack stands
Safety gloves and eye protection
Line/flare-nut wrenches
Hose cutter / rotary cutter
Fuel catch pan / rags
