BobCollins(AA)
Well Known Member
I purchased both Andair fuel boost pump and fuel valve one year ago and installed them on my RV-7A while building.
Two months ago started the engine for the first time and it ran well at idle and up to 1800 RPM. I ran the engine for approximately for 5 mins to allow the oil to warm up before increasing the power to 1800 RPM.
Last month I started the engine for the second time but it was not getting enough fuel and was sputtering (had 5 gallons of fuel in the tank). During the second engine run up the mechanical fuel pump could not provide enough fuel and the problem remained the same even when assisted by the fuel boost pump.
The aircraft was pushed back in the hangar and I disconnected the fuel hose from the Fuel Servo in order to check how much flow I was getting. I was getting only 12 gallons per hour out of the fuel flow gauge and also timed the flow and calculated the result which was the same. After checking for the obvious (blockage,vent blockage) I found no blockage. I proceeded to remove the fuel pump from the floor and connected a hose from the tank to the fuel boost pump I managed to get a output of 45 gallons per hour. I reconnected the hardware back to where it was originally and turned the boost pump back on and got 45 gallons per hour.
I never found any blockage or anything else for that matter. I don't know what the problem was and now for some reasons it works. I am getting ready to fly the airplane but now I am concerned about the fuel system (boost pump or fuel selector).
Any recommendations
Two months ago started the engine for the first time and it ran well at idle and up to 1800 RPM. I ran the engine for approximately for 5 mins to allow the oil to warm up before increasing the power to 1800 RPM.
Last month I started the engine for the second time but it was not getting enough fuel and was sputtering (had 5 gallons of fuel in the tank). During the second engine run up the mechanical fuel pump could not provide enough fuel and the problem remained the same even when assisted by the fuel boost pump.
The aircraft was pushed back in the hangar and I disconnected the fuel hose from the Fuel Servo in order to check how much flow I was getting. I was getting only 12 gallons per hour out of the fuel flow gauge and also timed the flow and calculated the result which was the same. After checking for the obvious (blockage,vent blockage) I found no blockage. I proceeded to remove the fuel pump from the floor and connected a hose from the tank to the fuel boost pump I managed to get a output of 45 gallons per hour. I reconnected the hardware back to where it was originally and turned the boost pump back on and got 45 gallons per hour.
I never found any blockage or anything else for that matter. I don't know what the problem was and now for some reasons it works. I am getting ready to fly the airplane but now I am concerned about the fuel system (boost pump or fuel selector).
Any recommendations