7.89mm Quick Connect Fuel Fittings for 39mm Pumps | Single and Dual Options from OneFastShop

If you have ever upgraded a fuel pump and then fought with hose clamps, leaky barb fittings, or adapters that do not quite line up, you know the pump swap is rarely the hard part. The connection to your factory fuel line is where most builds get messy. OneFastShop makes two quick-connect fittings that solve this cleanly — a single-output version and a dual-output version — both built specifically for the Walbro 39/50 DCSS pump family (450, 525, 535).

Here is how each one works and which setup is right for your build.

The Problem They Solve

Most aftermarket pumps use a barbed outlet. Your factory fuel line uses a quick-connect fitting, not a barb. So to bridge the two you end up with an adapter, a length of fuel-rated hose, and a clamp — three extra connections, each one a potential leak point inside the tank. Hose clamps loosen, and standard rubber hose degrades over time, especially on E85.

These fittings eliminate all of that. They mount directly to the pump outlet and give you a factory-style 7.89mm quick-connect port that clicks straight into your OEM fuel line. No clamps, no hose in between, no permanent modifications.

OneFastShop 7.89mm Single Outlet Fitting

The single outlet fitting is the right choice for most pump upgrades. If you are running a single pump with a standard fuel feed, this is all you need.

It is CNC-machined from 6061 aluminum with a black anodized finish, and it converts the pump outlet into a single 7.89mm SAE male quick-connect port. It slips over the pump outlet stub and is secured with a tightening collar, and an internal Viton O-ring creates a leak-free seal. Viton matters here because it is fully compatible with ethanol blends including E85, which degrades standard rubber over time. The fitting is reusable, so if you swap pumps later it comes off and goes onto the next one.

OneFastShop 7.89mm Dual Outlet Fitting

The dual outlet fitting gives you two 7.89mm quick-connect ports, and it works in two distinct configurations — this is the part the spec sheet makes clear and most people miss:

• Single-pump splitter: one pump feeds both ports, useful for dual-feed lines, parallel fuel rails, or high-flow setups where you want to split flow from one pump into two paths.
• Dual-pump combiner: the fitting mounts on Pump A, Pump B's output connects into one port, and both pumps' flow combines and exits the remaining port to the car. This is the classic configuration for dual in-tank pump setups on high-power builds.

Like the single version, it is CNC-machined 6061 aluminum with a Viton O-ring, slip-on collar mounting, E85 compatibility, and full reusability.

Which One Do You Need?

For most builds, the single fitting is the right call — if you are upgrading to a Walbro 450, 525, or 535 with a standard feed to your rail, it does the job cleanly. Choose the dual fitting if your build needs two lines from one pump, or if you are running a dual in-tank pump setup and need to combine both pumps' output into one feed.

Pump Compatibility

Both fittings are engineered exclusively for the Walbro / TI Automotive 39/50 DCSS pump family, which share the same outlet stub design:

• Walbro 450 LPH (F90000267 / TIA485-2)
• Walbro 450 LPH High Pressure (F90000274 / TIA450-2)
• Walbro 525 Hellcat (F90000285 / TCD470)
• Walbro 535 Hellcat Plus (F90000295 / TCD495)

They do not fit Walbro 255/350 LPH (GSS-series), AEM, DeatschWerks (including DW400/DW440), Aeromotive, or any inline pump. Confirm your pump matches one of the part numbers above before ordering.

Why the Connection Matters

A loose clamp or a degraded section of hose inside your fuel tank is not fun to diagnose and not fun to fix. These fittings take one of the most common weak points in an aftermarket fuel pump install and turn it into one of the most secure connections in the system. Both are in stock and ready to ship.

Get the single outlet fitting here, or the dual outlet fitting here.

Frequently Asked Questions

What pumps do these 7.89mm fittings fit?

They fit the Walbro / TI Automotive 39/50 DCSS pump family only: the 450 (F90000267 and F90000274), 525 Hellcat (F90000285), and 535 Hellcat Plus (F90000295). They do not fit GSS-series Walbro, AEM, DeatschWerks, Aeromotive, or inline pumps.

What is the difference between the single and dual fitting?

The single fitting gives one 7.89mm quick-connect output for a standard single-pump feed. The dual fitting gives two ports and can either split one pump into two lines or combine two pumps into a single feed for dual in-tank setups.

Do I need hose clamps or adapters with these?

No. The fitting mounts directly to the pump outlet with a tightening collar and provides a factory-style 7.89mm quick-connect that clicks into your OEM fuel line. No clamps, hose, or permanent modifications.

Are these fittings E85 compatible?

Yes. Both use an internal Viton O-ring that seals against gasoline, ethanol blends including E85, methanol, and race fuels.

Can I reuse the fitting if I swap pumps?

Yes. Both fittings are reusable and support multiple installations, so they transfer to your next pump as long as it is in the supported Walbro family.