Due to increased demand and industry-wide supply chain delays, we are currently experiencing above normal lead times for certain items. We are working at full capacity to ensure the quickest turn-around for your parts. Our vendors are also experiencing similar delays in obtaining raw materials for parts.

If you are in need of a part and time is of the essence, we ask you please call our sales team at 530-274-1795 to inquire about current stock status before placing your order.

If you have any questions or concerns, please do not hesitate to contact us via email or phone.

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Swepco 503 Gas Improver

Swepco 503 Gas Improver

Price: $10.50
Shipping Weight: 0.80 pounds
Quantity in Basket: None


Swepco 503 Gas Improver

A premium quality fuel additive designed to clean gum, varnish, sludge and other harmful deposits. Helps improve fuel combustion, reduce friction, prolong spark plug life and increase fuel mileage. It is also helpful in eliminating sticky valves and some pre-ignition problems and is an effective "carbon buster" for valve areas.

Treatment for gasoline engines:

-12 Ounces per 30 Gallons of Gas

As a "de-carbonizer":

- Start engine and allow to warm up
- Set at fast idle
- Carbureted engines - remove air cleaner and slowly pour 12oz directly into the carburetor
- Fuel injected engines - remove a small vacuum line from the intake manifold area and let it "suck" 12oz of 503 out of the bottle
- Immediately turn off the engine and let it cool down(preferably overnight)
- 503 will coat the valves and dissolve excessive carbon deposits
- After cool down, start engine and accelerate it until it stops smoking....excessive smoke will be evident until the "oiliness" of the 503 is burned off

Container size:

12 ounce bottles. 24 bottles to a case.

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