I have your AFS 4500 in my IO-390 powered RV-7 that has approximately 165 hours on it. During the past 25 hours of flight I have noticed unusually high fuel pressure readings. Most noticeable after I turn on the electric boost pump for landing. Nothing unusual when I turn on the electric boost pump before starting the engine. Nothing unusual when I turn on the electric boost pump for takeoff. Nothing unusual if I do not turn on the electric boost pump prior to landing, but turn it on after landing I get unusually high fuel pressures. Even when I turn on the electrical boost pump just after engine shut down (some readings as high as 260 psi). Is this a function of the VDO fuel pressure sender?


Thank you,
Terry