1993 7.3 idi Mechanical fuel pump replacement and starting Click to view on Bing8:45How to Install a 60278 Mechanical Fuel Pump on a 1986 Ford F250 - Duration: 4:29. Airtex-ASC Performance Pumps 30,642 views. 4:29. Here's How I Made My 300,000 Mile Ford F350 Dually FAST As HELLAuthor: Robs ShopViews: 34K Mechanical Fuel Pumps - Basic Information And Troubleshooting So, Most mechanical fuel pumps are used on older engines that have carburetors. How Mechanical Fuel Pumps Work. Mechanical fuel pumps siphon fuel from the gas tank. It then pushes it to the carburetor when the engine is cranking or running. All mechanical fuel pumps used on inline six cylinder and V8 engines are diaphragm type. Fuel filter: Before or after the fuel pump?? | The H.A.M.B. Most cars have a sock filter in the tank to take care of the big stuff. If I'm building a project I always replace this "sock" filter. Then if I'm running an electic pump I install a high flow filter BEFORE the pump and a high flow inline after the mechanical pump/ before the carb/s. Pre and Post Pump Fuel Filter Considerations: | Fuelab The “Post – Pump” filter is typically the filter that is replaced on vehicles as part of normal maintenance, while straining filters are typically installed inside the fuel tank itself (and not a part of normal maintenance). Considerations for this filter include: Fuel Type. Filter material or media can have compatibility issues.