Visconti Tuning A90 / A91 STG1 Fuel System Upgrade

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Visconti Tuning


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Wiring Kit

 What’s included:

  • Walbro 525
  • Visconti Fuel Pump Bracket
  • Visconti Fuel Pump 3/8 Quick Connect Fitting
  • Visconti Replacement IN-TANK Fuel Line
  • Visconti Sealed Wire-Pass-Thru
  • Holley Fuel Mat
  • NJ Style Zip Tie

    What advantages does this kit have over other solutions:

    • Keeps second fuel pump in the gas tank
    • Doesn't require extra fuel lines in the engine bay
    • Works with low fuel levels


    If you're not running our REFLEX Sequential Port Injection Kit, you'll need to activate our fuel pump relay using our non-REFLEX harness and a HOBB switch.

    (HOBB switch is not included)


    Our STG1 Fuel System upgrade for the B58 Toyota Supra is the ultimate upgrade for those trying to make big power. If your looking to run an upgraded turbo and run higher than E30, this upgrade is for you.

    During extensive testing it was found that the factory low pressure fuel pump would experience pressure drop above 550WHP causing cars with port injection to have fueling issues. The problem only got worse with higher blends of ethanol. Tuners would compensate the injector open time to account for lack of fuel volume but this causes problems and makes it impossible to have true Flex Fuel.

    Returns Policy

    --PLEASE NOTE: MOST ORDERS ARE SUBJECT TO RESTOCK OR CANCELATION FEE. PLEASE CALL OUR OFFICE FOR DETAILS AND EXCEPTIONS-- You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

    You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

    If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


    We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

    When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

    Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

    Financing Options Available - Click Here for Details