microflight

I have a JPI EDM 900 and no problem with ther fuel flow. However, I get the same oscilation in the fuel pressure. I even got a snubber from JPI and after we installed it,it seemed that the fuel presssure was very steady but after a few hourts the oscillation returned. Using the maual fuel pump without the engine running showes a very steady fuel pressure. Also,we connected a manual fuel pressure guage while the engine was running. Again the fuel pressure was rock steady. Yesterday, I disconnected the fuel line from the transducerr and ran a small amount of fuel through it with the manual boost pump. I then reconnected the fuel liine to the transducetr and ran the airplane including a mag check run-up to 2000 rpm. The result was rock steady fuel pressure at 25 psi. My belief is that the fuel pressure sensor is too sensitive and there is a small pulse from the engine driven fuel pump that the transducetr is able to pick up. Having said that, I am trying to find a solution thaty does not require disconnect/reconnect.. Also, when i reconnect the fuel line there is an air gap. I believe this air-gap acts llike a baffel and damps the small pulse so that the transducer does not pick it up. Problem still not solved but I think I understand the issue.