Q - Can I run your pumps in reverse? A - You can run all pumps in both directions without causing damage or shortening the service life of the pump. Q - Do I need to prime your pump before use? A - You may have to prime the pump initially. After that they do not need to be primed for subsequent use. In most cases where the pump has problems with priming, there is an air leak on the pick-up side of the hoses. Q - Will the pump handle debris coming from the oil pan or the fuel tank ? A - All pumps will handle any organic contaminants usually found in fuel and oil tanks. If you are concerned about bigger particles, (sand, metal shavings, etc.) you should consider installing one of our in line stainless steel strainers FL-3 or FL-6. Q - What size hose should I use to connect my oil change system? A - We recommend a minimum of 1/2” ID hose or piping for all runs under 10 feet, and 5/8” ID or larger for longer runs. Use only high quality Type-A petroleum resistant hose. Q - Can I pump fuel with your pumps? A - Our pumps are NOT rated for gasoline. You can pump diesel fuel and oil with the gear pumps only. The OP-4 and OP-6 will need fuel resistant impeller part# 360014 installed for diesel fuel applications. Q - Can your pumps be mounted in any orientation? A - Our pumps will work in any orientation, however we do not recommend that they be mounted with the pump head above the motor. In an event of a spill during servicing the pump fluid may enter the motor. If you have any questions, please email them to: info@enginegearonline.com