Q: Will this adapter fit my 1987–1998 GM TBI or Vortec truck?
A: This 6AN adapter set is designed for the M16x1.5 feed port and M14x1.5 return port found on many 1987–1998 GM TBI and Vortec trucks, including Chevy/GMC C/K, Silverado, Sierra, Suburban, and Tahoe. Always verify your vehicle’s actual thread sizes before ordering, as some variations may exist.
Q: What size are the threads on the GM TBI fuel pressure sensor?
A: On most 1987–1998 GM TBI systems, the fuel feed port uses an M16x1.5 thread, and the fuel return port uses an M14x1.5 thread. This adapter converts both to standard 6AN (9/16-18 UNF) fittings for use with AN fuel lines and aftermarket fuel system components.
Q: Can I use this adapter to repair leaking fuel sensor threads?
A: Yes. Many users install this kit when the original fuel pressure sensor threads are leaking, stripped, or damaged. By threading the adapter into the throttle body or fuel rail, you get a fresh sealed surface and a standard 6AN connection for your fuel lines.
Q: What is the pressure and temperature rating of this 6AN adapter?
A: The adapter is rated for up to 1500 PSI working pressure and a temperature range of -40°F to 250°F (-40°C to 121°C), making it suitable for typical fuel system pressures and under-hood conditions on street and mild performance applications.
Q: Is this adapter compatible with E85 and other fuels?
A: The adapter body and sealing materials are designed for fuel, oil, water, and air applications. For E85 or ethanol-blended fuels, ensure your fuel hoses and other system components are also ethanol-compatible. This adapter does not change the compatibility of your fuel pump, regulator, or hoses.
Q: Can I use this adapter for power steering or other fluid lines?
A: The adapter is rated for fuel, oil, water, and air, and is commonly used in power steering hose adaptations on TBI/Vortec trucks. However, always verify that the thread sizes and pressure requirements match your specific application. Do not use it for brake lines or safety-critical hydraulic systems.
Q: What is included in the package?
A: The kit includes one M16x1.5 to 6AN adapter for the feed side and one M14x1.5 to 6AN adapter for the return side. It does not include AN fuel lines, fuel filters, or sensors.
Q: Does this replace GM part numbers 47-0001 and 47-0002?
A: Yes, this adapter set cross-references GM-style service part numbers 47-0001 and 47-0002, which are commonly used to convert TBI/Vortec fuel system ports to 6AN fittings. Fitment should still be verified on your specific truck.
Q: Do I need any special tools to install these adapters?
A: Basic hand tools such as an open-end wrench or socket for the metric side, and a 6AN flare nut wrench for the AN side are typically sufficient. Ensure the threads are clean and free of debris before installation. If you are unsure about your particular vehicle, have a professional mechanic inspect and install the adapters.
Q: Where can I find 6AN fuel lines and fittings to complete my fuel system?
A: You can browse our full selection of 6AN fuel hoses, PTFE fuel line kits, AN fittings, and fuel filter kits designed for GM TBI/Vortec and LS-swap applications. Each product page includes detailed fitment and installation information.
