- January 4, 2005
- Reaction score
- City, State
- Tucson, AZ
- Year, Model & Trim Level
- 2000 XLT 5.0 AWD
My wife's 2000 5.0 with 200,000 miles has a really loud fuel pump whine that is driving her nuts. Bosch pump, strainer, and filter installed two years and 11,000 miles ago. Has been whining loudly for at least six months now. Fuel level in the tank makes no difference.
- I disconnected the fuel line at the frame on the driver's side of the engine and ran a hose from the output into a fuel can. With the fuel pump commanded on manually, it sounds normal with minimal whine.
- Connected a fuel pressure gage at the fuel rail and it reading 50 psi. Again with the fuel pump commanded on manually and the engine not running.
- Removed the fuel pressure gage but left the hose connected to the fuel rail. Ran the output of the hose into a fuel can, commanded the fuel pump on manually again, and the pump still whines loudly.