The dual actuator moves freely and the pump turns nicely as it should. Porsche Cayenne Fuel Pump Replacement at your home or office. The pump has been in storage for many years. Wow, that is not too much more than I paid for a lightly used, recently rebuilt pump. Service What is the fuel pump and how does it work? Variable tooth spacing on the crank drive gear better matches the belt teeth at the moments when the cam pulls the hardest, stretching the belt. Karmakanix recommends that the camshaft be inspected prior to timing belt replacement on engines with overmiles.
Filtration of the fuel occurs either in the fuel tank using a pick up screen or externally with a replaceable filter mounted in the fuel supply line. If a timing belt breaks, the most reliable fix is to replace the camshaft and lifters. If the fuel system uses an in-line external filter, a filter is often replaced. Nice used T mfi pump, spins freely, spare for that I no longer own, cleaning out garage, feel free to contact me if you have any questions. The serial number is shown in the pictures below. To squeeze in the cam lobe that runs the injectors, the cam lobes for the valves got thinner. Mike, you are spot-on. This proved a great improvement that reduced their failure rate.