![]() ![]() 3, which specifically states solvent resistance to gasoline, especially on modern engines that use injectors rather than carburetors such as the E-TEC and HPDI (high pressure direct injection) and any diesel engine. With the advent of ethanol present in modern gasoline, try Form-a-gasket No. Another product also offered by Permatex is the High Temperature Thread Sealant. Tech data on this sealant says it has medium solvent resistance and is recommended for fuel sender type applications. For gasoline, regular old gasoline resistant Aviation Form-a-gasket Number 3 is the best option. Mechanics repairing injectors, fuel pumps and carburetors can tell you firsthand it is not uncommon to trace fault in the fuel component to clogging from a piece of teflon tape that washed off the ends of the threads, clogging in the first tiny micron orifice it encounters, if not the fuel pump then an injector or carburetor gallery. Liquid or paste type thread sealants are kinder to sensitive components down stream. This is not recommended because it risks breaking free. Backyard mechanics will tell you they've used regular old gas resistant teflon tape (yellow stuff) with success. To choose the appropriate thread sealant, look for its chemical resistance to fuel (diesel or gasoline) or oil running through the line. ![]() How to choose thread sealant for fuel applications Both of these thread types are designed to work with a sealant. This thread form is straight and requires the matching UNF thread to mate with. ![]() Another thread type sometimes used is UNF such as on the Racor Turbine Fuel Filter series. NPT leaves a minute gap at the very point of the male thread tip and female valley. The matching thread keys into the female thread precisely both on the angle and depth of thread. Brass or stainless steel is the the go to metal for these components. To plumb a fuel hose line you must assure the thread type and if NPT or NPTF then use a Male hose barb fitting. Most fuel filters, pumps, tank connections, etc., come with female NPT or NPTF ports. It is critical that you first know the thread type in the component you are purchasing and then mate it with the matching thread type. NPT is a tapered thread common to plumbing connections in North America, and is also the most common thread type in fuel line components. For most components such as a pre-fuel filter (aka fuel water separator) the thread type is typically NPT or NPTF and requires sealant around the threads. A frequently asked question from DIY boaters is how to seal the pipe threads found on fuel system components. ![]()
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