Product Details
About this part
Stage 1 fuel system upgrade designed to increase fuel delivery capacity for high horsepower B58 applications.
This system is designed specifically for Toyota A90 and A91 Supra platforms where additional low pressure fuel supply is required to support upgraded turbos, port injection, and higher ethanol blends.
Our STG1 Fuel System Upgrade adds a second in-tank fuel pump while retaining factory style plumbing and fuel routing. This allows the system to maintain stable fuel pressure even under high horsepower conditions.
During extensive testing it was found that the factory low pressure fuel pump begins to experience pressure drop around 750 WHP. This issue becomes more severe when running higher ethanol blends. Tuners often compensate by increasing injector open time, but this creates inconsistent fueling and makes true flex fuel operation difficult.
This upgrade provides the additional fuel volume required to maintain proper fuel pressure and support higher power levels.
What’s included:
Walbro 525 fuel pump
Visconti fuel pump bracket
Visconti fuel pump Y quick connect fitting
Visconti replacement in-tank fuel line kit
Visconti sealed wire pass-through
Holley fuel mat
Advantages over other solutions:
Keeps the second fuel pump inside the fuel tank
Does not require additional fuel lines in the engine bay
Maintains proper fuel pickup even at low fuel levels
Wiring:
If you are not running our ReFlex Sequential Port Injection Kit, you will need to activate the fuel pump relay using our non-ReFlex harness and a Hobbs switch.
(Hobbs switch not included)
Fitment
Not sure it fits? Contact us with your car's year, model and VIN and we'll help you confirm before you order.
If a part doesn't fit as expected, contact us and we'll work with you to resolve it.
Majority of products have a fitment section in the product description or within the title.
Returns
- Unused, uninstalled parts can be returned or exchanged within 30 days of the order date.
- To start a return: Contact us first, don't use Return to Sender.
- Returns can have up to a 20% restocking fee.
- Built-to-order and special-order items can't be returned or cancelled once production begins.
Shipping
- Orders are processed 7 days a week to ensure your product ships as quickly as possible.
- Inspect parts within 10 days of delivery, and reach out regarding any damage or missing pieces.
See our Tariff Policy
Warranty
- All parts retain the manufacturer's warranty.
- Warranty claims are subject to the manufacturer's approval.