How far can a Harley go on a tank of gas?

Harley-Davidson motorcycles typically get 40-50 miles per gallon, which is a good reference point for how far you can ride based on the capacity of your gas tank. Sportsters tend to be smaller and get more miles per gallon, while large Touring bikes or Trikes are heavier and are on the lower range of miles per gallon.

What are the parts of fuel system?

Many new bikes are fuel injected, and have a computer to control the amount of gas fed to the engine. There is a fuel pump that provides fuel to the throttle body, which feeds the gasoline to the engine. Older bikes are carbureted, which is a simple system. Gas tends to be gravity fed from a gas tank to the carburetor and the amount of gas delivered to the engine depends on the size of the carburetor jets that are installed. The carburetor is tuned by changing the jets, which have different size orifices, which meters the amount of gasoline delivered to the engine.

Why is my motorcycle leaking gas?

If your motorcycle is leaking gas take a close look to see where the leak is originating. Common problems would include a leaky fuel valve (petcock), damaged fuel line, or if the fuel is coming from the carburetor, a stuck float. A leaky fuel valve or damaged fuel line can be replaced, while a stuck carburetor float can typically be fixed. The carburetor may just need some taps on the float bowl with the handle of a screwdriver to free the stuck float. If that doesn't work, make sure the fuel valve is off, remove the float bowl and check for grit or any debris that could be causing the float needle to not completely seat, which would allow gas to continue flowing into the float bowl even when it is full.

Gas Tanks

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Cycle Standard Small Flush Mount Pop-Up Gas Cap & Weld-In Bung - Vented - Chrome
63 reviews $95.94

Prism Supply Co. 3/8" NPT Petcock - Brass
1 review $94.99

Prism Supply Co. 1/4 inch NPT Petcock - Brass
7 reviews $94.95

Cycle Standard 22mm Petcock Round Body Solid Brass Harley-Davidson Style - Left Side Position
14 reviews $70.22

Lowbrow Customs Brass Gas Filler Cap - Vented
7 reviews $39.63

Lowbrow Customs Coffin Chopper Gas Tank - 1.4 Gallon - USA Made
$275.55

Cycle Standard 3/8 inch NPT Petcock Straight Outlet
28 reviews $39.33

Cycle Standard 3/8 inch NPT Petcock 90 Degree Outlet
19 reviews $36.30

Prism Supply Co. 3/4"-18 Petcock Fits Early Style Harley-Davidson Tanks - Stainless Steel
$134.99

Lowbrow Customs Domed Screw-In Gas Cap for Harley-Davidson 1996 & Later - Antique Brass
3 reviews $83.23

Lowbrow Customs Dished Screw-In Gas Cap for Harley-Davidson 1996 & later - Brass
16 reviews $83.23

Cycle Standard Dished Wassell Peanut Mid-Tunnel Gas Tank - 2.0 gal
15 reviews $240.00

Prism Supply Co. 3/8 inch NPT Petcock - Stainless Steel
2 reviews $119.95

Lowbrow Customs Aluminum Gas / Oil Filler Cap with Weld-In Steel Bung - Unvented
4 reviews $39.63

British Standard 1/4 inch BSP Petcock Fuel Valve - Main - No Reserve - For Triumph BSA Norton
15 reviews $25.48

Motone Screw-In Billet Adapter for 2.5" Monza Gas Cap for 1996 & later Harley-Davidson
3 reviews $56.08 $69.64

Lowbrow Customs Brass Gas Filler Cap with Weld-In Steel Bung - Vented
10 reviews $54.04

Cycle Standard Narrow Axed Chopper Motorcycle Gas Tank 1.9 gallon
16 reviews $213.89

Cycle Standard 22mm Petcock Round Body Chrome Harley-Davidson Style - Left Side Position
18 reviews $70.23

Cycle Standard Screw-In Harley Stock Style Vented Gas Cap - 1996 & up - Black
62 reviews $20.61

British Standard 1/4 inch BSP Petcock Fuel Valve - Reserve - For Triumph BSA Norton
17 reviews $25.20

Motion Pro 1/4 inch NPT Mini Petcock Straight Outlet - No Reserve
7 reviews $19.99

Cycle Standard Axed Dual Cap Chopper Gas Tank - 2.2 Gallon
30 reviews $192.02

Cycle Standard Custom Flush Mount Chrome Pop-Up Gas Cap and Weld In Bung
5 reviews $94.79

Cycle Standard Screw-In Harley Stock Style Vented Gas Cap - 1982-1995 - Chrome
$26.75

Cycle Standard 22mm Petcock Harley-Davidson Style - Black - Right Hand Outlet
13 reviews $26.73 $36.84

Motion Pro 1/4 inch NPT Mini Petcock 90 Degree Outlet - No Reserve
17 reviews $22.99

Lowbrow Customs 22mm to 3/8 inch NPT Chrome Petcock Adapter Nut
13 reviews $26.36

Cycle Standard Bayonet / Cam Harley Style Vented 2" Gas Cap - Black
33 reviews $18.04

Cycle Standard 1/4 inch NPT Petcock Chrome - 90 Degree
26 reviews $36.42

Lowbrow Customs Aluminum Gas / Oil Filler Cap - Unvented
6 reviews $25.16

Kustom Tech In-Line Brass Motorcycle Petcock
13 reviews $87.36

EMGO Triumph / BSA / British Motorcycle Gas Tank Cap OEM #83-3875
29 reviews $21.56

Lowbrow Customs Banded Screw-In Gas Cap for Harley-Davidson 1982-1995 / Modern Triumph Bonneville T100 / T120, Scrambler, Thruxton - Brass
6 reviews $83.23

Lowbrow Customs Domed Screw-In Gas Cap for Harley-Davidson 1996 & later - Brass
19 reviews $83.23

Motone Screw-In Billet Gas Cap for 1996 & later Harley-Davidson - Vented - Black
$82.47 $102.31

Pingel 22MM Power-Flo Petcock - Round Finned Body - Chrome - Inward
2 reviews $161.95

Lowbrow Customs 22mm to 1/4 inch NPT Chrome Petcock Adapter Nut
8 reviews $26.36

Cycle Standard Domed Slim Black Screw-In Harley Style Gas Cap 1996 & up
47 reviews $25.45

Lowbrow Customs Finned Thread-In Gas Cap for Harley-Davidson 1996 & later - Polished
35 reviews $51.28

Lowbrow Customs Aluminum Gas Filler Cap - Vented
6 reviews $30.02

Cycle Standard Bayonet / Cam Harley Style Vented 2.5" Gas Cap - Chrome
13 reviews $33.95

Prism Supply Co. 3/4"-18 Petcock Fits Early Style Harley-Davidson Tanks - Brass
$134.99

Golan Products Inc. 3/8 inch NPT Click-Slick Petcock - Round Body - Chrome - Straight
$190.95

Lowbrow Customs Competition Screw-In Gas Cap for Harley-Davidson 1996 & later - Black
32 reviews $42.17 $51.50

Lowbrow Customs Good Luck Fuel Reserve Bottle
36 reviews $25.29

Cycle Standard 1/4 inch NPT Lever Petcock - Solid Brass
35 reviews $24.08

Lowbrow Customs Ignition Switch Kit for 1948-59 Harley model 125 / 165 Hummer Gas Tanks
2 reviews $58.89

Cycle Standard 1/4 inch NPT Petcock Chrome - Straight
25 reviews $36.39

Cycle Standard 22mm Petcock Harley-Davidson Style - Chrome - Straight Outlet
18 reviews $36.35

Cycle Standard Bayonet / Cam Harley Style Non-Vented 2" Gas Cap - Chrome
$13.57

Cycle Standard Custom Flush Mount Polished Stainless Steel Pop-Up Gas Cap and Weld In Bung
9 reviews $103.27

British Standard Gas Tank Mounting Kit Triumph 1963-67 T120 TR6 T100 TR5 OEM #00-0088
11 reviews $49.44

Cycle Standard Gas Tank Mounting Kit 1958-1985 Harley-Davidson Sportster XL
1 review $19.54

Lowbrow Customs Dished Screw-In Gas Cap for Harley-Davidson 1996 & later - Aluminum
4 reviews $48.55

Lowbrow Customs Domed Screw-In Gas Cap for Harley-Davidson 1996 & later - Aluminum
12 reviews $48.55

British Standard Sealing Washer for British 1/4 inch BSP Petcocks OEM #70-7351 - Triumph BSA Norton
17 reviews $8.01

Colony #9893-18 Gas Tank Mounting Kit 1937-1975 Harley-Davidson Big Twin 1972-1972 FX - Parkerized
3 reviews $17.42

Colony #7807-3 Gas Tank Fitting Kit 1950-1965 Harley-Davidson Big Twins - Chrome Plated
1 review $28.00

Lowbrow Customs Domed Screw-In Gas Cap for Harley-Davidson 1982-1995 / Modern Triumph Bonneville T100 / T120, Scrambler, Thruxton - Brass
10 reviews $83.23

Cycle Standard Domed Slim Chrome Screw-In Harley Style Gas Cap 1996 & up
16 reviews $27.50

Solid Custom Rippled Screw-In Billet Gas Cap for 1996 & later Harley-Davidson - Vented - Black
1 review $79.99 $99.99

Lowbrow Customs 22mm to 1/4 inch NPT Brass Petcock Adapter Nut
17 reviews $26.36

Lowbrow Customs 22mm to 3/8 inch NPT Brass Petcock Adapter Nut
13 reviews $26.36

Bates 1/4" NPT Petcock Conversion Kit 1940-65 H-D Big Twins and 45”/750 cc Sidevalves - CAD Plated
4 reviews $77.49

Motone Bolt-Down Billet Adapter for 2.5" Monza Gas Cap
$37.19 $46.19

Lowbrow Customs Brass Gas / Oil Filler Cap - Unvented
10 reviews $33.62

British Standard 1/4 inch BSP Petcock Fuel Valve Reserve For Triumph 650 750 Norton 750 850
3 reviews $22.53

Colony #3718-4 Fuel Tank Rubber Grommet Kit 2000-2017 Harley-Davidson Softails
$20.90

How-to Select a Killer Custom Motorcycle Gas Tank & Its Accessories Choosing a Gas Tank for Your Motorcycle If you are in search of a killer custom motorcycle gas tank, you are in the right place. Lowbrow Customs has a great selection of some ...

Choosing a Gas Tank for Your Motorcycle

If you are in search of a killer custom motorcycle gas tank, you are in the right place. Lowbrow Customs has a great selection of some of the most sought-after custom motorcycle gas tanks available. These are high-quality Lowbrow Customs gas tanks that you see on some of the most popular builds out there.

We have a great selection of Sportster® gas tanks that can completely transform the look of your build. Classic choices like the original P-Nut Deep Tunnel and Mid-Tunnel gas tanks offer that smooth, rounded style so many builders love. If clean lines and a front-forward teardrop shape are more your style, the Narrow Sporty Frisco Gas Tank is a perfect fit. For those looking to add vintage chopper flair with a practical twist, the WX Split Gas Tanks stand out with their timeless design and dual-cap functionality, making them a versatile option for any custom build.

If you need just a straight-forward replacement Sportster® motorcycle tank, we have that too. Lowbrow Customs also carries custom motorcycle tanks for Big Twins, vintage motorcycle gas tanks, teardrop gas tanks, or old school chopper gas tanks like the classic coffin tank. All of our custom Harley fuel tanks are made from high quality steel and are professionally welded. The custom motorcycle gas tanks come pre-sanded ready for paint.

We always recommend that you pre-fit any aftermarket motorcycle gas tank before painting. Be sure to check for clearance or mounting issues as different combinations of triple trees, risers, and handlebars may cause clearance issues when turning.

Custom Motorcycle Gas Tank Mounting Hardware and Accessories

Now that you have your gas tank picked out, be sure to check out our selection of gas tank mounting hardware and accessories. We have some of the coolest custom motorcycle gas caps you can find, like sportster flush mount gas caps. From the classic spinner sportster gas cap with the 3-prong design to standard replacement gas caps and pop-up gas caps.

We carry a full selection of mounting hardware from Colony™ to help get the tank mounted properly. We also carry a nice assortment of motorcycle fuel petcocks, weld in tank bungs, and the best fuel reserve bottles in the market. If you are looking for a custom motorcycle gas tank, Lowbrow Customs is the place to be.

Custom motorcycle gas tanks for sale combined with an assortment of fuel petcocks, caps, mounting hardware and accessories. All in one easy to use website ready to ship to your door. Last but not least, if you are totally new to customizing your gas tank, watch our video how to mount a gas tank for detailed steps that you can follow.

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