EVIL ENERGY 1/2inch,5/16inch,3/8inch Barb Billet Inline Fuel Filter 30 Micron Aluminum Black for Car EFI & Carb Fuel Systems

Q: Which barb size does this small inline fuel filter need?

A: Measure the inside diameter of the fuel hose, not the outside diameter. Many carbureted cars and trucks use 5/16 in or 3/8 in hose, custom higher-demand lines may use 1/2 in, and an inline fuel filter for motorcycle fuel lines is often 5/16 in on larger or modified bikes. Do not stretch 1/4 in hose over the 5/16 in barb, because a tight fit can split the hose and leak fuel near a hot engine.

Q: Is a 30 micron fuel filter fine enough for a carbureted car or truck?

A: Yes. Carburetors tolerate coarser filtration than fuel injectors, and 30 to 40 micron is a practical range after the fuel pump. It helps protect the needle and seat from rust and debris common in older tanks. A heavily rusted tank should still be cleaned or replaced, since the filter can clog quickly otherwise.

Q: Where does this filter go on a carbureted car with a mechanical fuel pump?

A: Install it on the pressure side, between the mechanical pump and the carburetor, in a rubber hose section. Many classic-car owners avoid adding a fine filter on the suction side because a mechanical pump pulls poorly through restriction. Route the filter away from exhaust heat. If the carburetor also needs regulated pressure, a carburetor fuel system kit adds an adjustable 4.5-9 PSI regulator and gauge.

Q: Can this barb filter connect to the factory steel fuel line on an older car?

A: Yes, if the steel line has enough end or bead for a secure hose connection. Add short sections of fuel-rated hose on both sides of the filter, keep clamps away from any sharp edge, and support the line so filter weight does not hang on the hose. Do not cut a line without first relieving pressure and draining fuel into an approved container.

Q: Can this 30 micron filter be used on an automotive EFI system?

A: Yes, as a coarser stage before the pump when it matches the pump's flow needs, but not as the last filter before the injectors. Fuel injectors typically need about 10 micron filtration after the pump. On an LS swap or EFI conversion, confirm the barb, hose, and clamps suit the pressure on that section of line.

Q: Does a carbureted motorcycle need an inline fuel filter if the petcock already has a screen?

A: It is not always required, but it adds useful protection on an older bike. A petcock screen stops larger debris, while an added 30 micron filter can catch fine rust before it reaches the float needle or jets. If the filter clogs quickly, clean or seal the fuel tank.

Q: Will a 30 micron sintered bronze filter flow enough for a gravity-fed motorcycle?

A: Test it, because gravity feed has very little pressure to push fuel through any filter. Let the fuel line run into a measured approved container for 30 seconds without the filter, then repeat with the filter installed. A big drop means the bike needs a different setup. Also ride long enough at highway speed to confirm there is no fuel starvation at sustained throttle.

Q: Can this barb fuel filter be added to a factory fuel-injected motorcycle?

A: Do not cut into the high-pressure fuel line on a factory fuel-injected motorcycle. Most modern EFI bikes filter fuel at an in-tank pump assembly, and the factory system uses dedicated high-pressure connections.

Q: What fuel hose and clamps should be used with a barb inline fuel filter in the US?

A: Choose hose marked SAE J30R9 when ethanol-blended pump gas is part of daily use, since the R9 grade is made to handle bio-blended fuels and fuel injection use. Smooth-band fuel injection clamps work better than slotted screw clamps, and a properly sized spring clamp holds even tension on low-pressure carbureted lines. Replace any hose that looks hard, cracked, or swollen.

Q: Is this inline fuel filter safe to use with E10, E15, or E85 pump gas?

A: This filter supports gasoline and diesel, including common US pump gas blended with up to 10% ethanol (E10). It is not compatible with E85. At the pump, also watch for E15, often sold as Unleaded 88: the EPA does not approve this blend for any motorcycle or for conventional vehicles older than model year 2001. Vehicles that sit for weeks also deserve fresh fuel, because ethanol blends can separate and leave water in the tank.

Q: How do you clean the sintered bronze element?

A: Relieve any fuel pressure, shut off the fuel supply, and drain the line into an approved container. Open the housing, then soak the bronze element in a suitable parts-cleaning solvent and blow it out gently from the inside with low-pressure air. Let it dry fully, check the O-ring, and reassemble in the original order with the arrow in the correct direction. Replace the filter if the element stays dark, feels restricted, or the housing no longer seals.