MikeyDale
Well Known Member
I have got 19 hrs in Phase 1 and my mech fuel pump has never missed a beat. Lyc IO360 W/Bendix FI. Burning 12 gph I get 23 psi. Burning 8 gph I get 26 psi. My engine rebuilt 75 hrs ago plus the 19 I put on it. Fuel pump was rebuilt same time as the engine. But, yesterday, I filled up with gas to the very top of both tanks. I took off and flew 30 minutes and landed with no issues. When I restarted after on the ground about 30 minutes, my fuel pressure started fluctuating and engine died. OAT 80. I restarted and taxied out ok without the boost pump. I turned the boost pump on and took off. I climbed out and turned off the boost pump and cruised 1 hr. Back home over my airstrip before desending, I decided to do some stalls. When I came back in with the power after stalling, fuel pressure started fluctuating. Several times later, I made the fuel PSI fluctuate in cruise burning 8 gph making 30deg backs right and left. Tried both tanks, same. I landed. ....De-cowled and checked everything out. Looked good. I took the airflow performance boost pump fuel filter out and blew thru it and it had no resistance. Found two tiny slivers of aluminum cleaning it, otherwise, clean as a whistle..........Cranked up this morning, OAT 73, no boost pump, and after warming up started taxi and PSI started fluctuating! Both tank vents are clean. No other fuel filters....Is there a screen in the Lycoming mechanical pump that could be clogged? Ive never had one apart. Should I go ahead and order a new fuel pump? I've read some threads suggesting a blast tube on the fuel pump in which have not, but fluctuating pressure in the cool morning before taking off rules that out, doesn't it? Thanks in advance.