• Cups may not be ethanol ready. Be sure you are buying non black cups that are being currently produced, like our cups.
• High concentration of ethanol can cause even the best cup to fail.
• Too much chemical being added to the gas. We recommend our Ethanol Defense.
• Accelerator pump well may need polishing. Today’s gas has much less lubrication these days. Polish the well with crocus cloth to provide a smooth glide.
• Letting the engine sit for prolonged periods will cause ethanol to sit at the bottom of the pump well.