Cool Check Engine Light After Seafoam In Gas Tank References. As mentioned earlier, it’s made of petroleum products. Use one ounce of sea foam per gallon of fuel for scheduled/every tank maintenance.
Yes, overfilling the gas tank may cause the check engine light to come. However, just be aware that the engine must be running in order for sea foam to make its way from the fuel tank into the upper engine where it can. As mentioned earlier, it’s made of petroleum products.
