Fuel Tank Caps & Fillers

Refuelling during pit stops, or does your original tank need a new locking cap? This category covers fuel caps, filler necks, dry break couplings and hose kits for both standard tanks and fuel cells in track and road projects.

From fuel cap to dry break system

A simple fuel cap closes the filler and can have a lock, e.g. OMIX's black locking fuel cap for Jeep Wrangler (YJ) 91-95. For track projects there are dry break systems – couplings that typically seal tight when the fuel can is removed – e.g. dump cans with pressure relief valve and remote-mount female couplings in 1.5 inch from Radium Engineering. Filler necks and hose kits connect the filler to a fuel cell or a fuel tank. The category also includes parts from Aeromotive.

How to choose cap and filler

• Diameter: Neck, hose and coupling must match. Several parts in the category are sized for 1.5 inch inner diameter.
• Venting: A vented cap lets air pass when the tank is filled or emptied. Whether you need it depends on the tank's other venting.
• Mounting: Choose between direct mounting on the tank, e.g. Radium's 3-bolt filler neck for FCST-X, or a remote-mount filler with straight or angled connection, depending on the space in the car.
• Hose: A clear filler hose can make it easier to see the fuel in the hose.

Check seals and O-rings regularly for cracks, and protect the dry break probe with a cap so dirt doesn't get into the coupling. If the tank also needs securing, you'll find brackets under fuel cell mounting kits.

Frequently asked questions

When should I choose a vented fuel cap?

A vented cap lets air pass so no vacuum builds up when fuel is drawn out. If the tank already has separate venting, a non-vented cap may be the right choice. It depends on your whole system.

Does a dry break coupling on the car also require a special fuel can?

Yes. The coupling on the car is used together with a dump can with a matching probe. Check that the size matches, e.g. 1.5 inch, before you combine parts.

Can I use a racing filler on a car that needs to pass road inspection?

It depends on the product and the car. Check approval for the specific part number, and clear it with the inspection authority before you fit the filler to a registered car.