Mercedes Mullins
Fuel line connectors are used to connect fuel lines to the engine. They are available in a variety of sizes, which are usually indicated by numbers. For example, an AN size 2 designates a tube OD of 1/8” (2 x 1/16”), the tube OD of AN size 3 is 3/16” (3 x 1/16”). The numbers on fuel line connectors can also refer to part numbers, which are used to identify and order replacement parts.
| Characteristics | Values |
|---|---|
| Connector size | 5/16, 3/8, 8mm, 10mm, 1/8, 3/16 |
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What You'll Learn
AN Thread Size
The numbers on fuel line connectors refer to the 'AN Thread Size'. AN fittings have straight threads and use O-ring seals. The O-ring size is typically defined by the 'AS' standard. Dash numbers are usually assigned based on the size. For example, an AN size 2 designates a tube OD of 1/8” (2 x 1/16”), the tube OD of AN size 3 is 3/16” (3 x 1/16”). Boss-Seal style O-rings are typically in the "900" Series, for example, -906 is for -6AN ports, and -908 is for -8AN ports.
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O-ring size
The O-ring size is typically defined by the "AS" standard. Dash numbers are usually assigned based on the size. For example, -906 is for -6AN ports, and -908 is for -8AN ports. Boss-Seal style O-rings are typically in the "900" series.
AN fittings have straight threads and use O-ring seals. The O-rings are often used in conjunction with a tube or flexible hose. The tube OD of an AN size 2 is 1/8" (2 x 1/16"), and the tube OD of an AN size 3 is 3/16" (3 x 1/16").
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Dash numbers
Boss-Seal style O-rings are typically in the "900" series. For example, -906 is for -6AN ports, and -908 is for -8AN ports. The O-ring size is typically defined by the "AS" standard.
While these measurements reflect AN standards, the actual ID and OD can vary slightly from AN specification depending on the supplier.
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Hose repair
The numbers on fuel line connectors refer to the size of the connector. For example, an AN size 2 designates a tube OD of 1/8” (2 x 1/16”), the tube OD of AN size 3 is 3/16” (3 x 1/16”). The AN size number is correctly displayed with a dash before the number.
If you need to repair a fuel hose, you can buy a fuel line repair kit. These kits include part numbers for the connectors you need. For example, the Dorman Products Fuel Line Repair Kit includes part numbers 800-054 and 800-055. You can also buy a fuel hose repair line, such as the 800-933.
When repairing a fuel hose, it's important to make sure that the male and female connectors are the same size. The push-in sizes are typically listed as 5/16 and 3/8 or 8mm and 10mm. At Russell, they used one part number for 3/8 & 10mm and another for 5/8 & 8mm. The 3/8 size has a little more variance, so be careful when using this size.
If your fuel lines are leaking, it's likely that the o-rings are damaged. You can buy replacement o-rings, but you'll need to know the correct size. Boss-Seal style O-rings are typically in the "900" Series. For example, -906 is for -6AN ports, and -908 is for -8AN ports.
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Part numbers
Dash numbers are typically assigned based on the size. For example, -906 is for -6AN ports, and -908 is for -8AN ports. The O-ring size is typically defined by the "AS" standard. Boss-Seal style O-rings are typically in the "900" Series.
When it comes to fuel line connectors, it is important to ensure that the male and female parts are the same size. Different manufacturers may use different part numbers for the same size, so it is important to refer to the specific manufacturer's specifications. For example, at Russell, one part number was used for 3/8 & 10mm, and another for 5/8 & 8mm.
When searching for replacement parts, it is helpful to have the specific part number, as well as information about the make, model, and year of the vehicle. This will ensure that you are able to find the correct part for your specific application.
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Frequently asked questions
The numbers refer to the size of the connector.
This designates a tube OD of 1/8” (2 x 1/16”).
This designates a tube OD of 3/16” (3 x 1/16”).
This is the size of the push-in connector.
This is the size of the push-in connector.
