MARZ Posted August 5, 2016 Report Posted August 5, 2016 What max pressure (normal and healthy ) do you see with the electric pump on and mixture knob all the way out? ( pre start) What would the minimum pressure be to indicate an issue?
N201MKTurbo Posted August 5, 2016 Report Posted August 5, 2016 (edited) The limits on the electric fuel pump is the green arc on the fuel pressure gauge. My experience is the engine will stumble if the fuel pressure gets below the green arc. Edited August 5, 2016 by N201MKTurbo
Marauder Posted August 5, 2016 Report Posted August 5, 2016 What max pressure (normal and healthy ) do you see with the electric pump on and mixture knob all the way out? ( pre start) What would the minimum pressure be to indicate an issue? Mike -- not sure which type Mooney you are talking about. I normally don't leave the mixture all the way out on a pre-start. When I have the mixture all the way in, I will see 27 psi with just the boost pump on. I did take note once of the pressure once with the mixture out. It hit a little over 28 psi. The normal operating range for my Mooney is 14 to 30 psi. I have never seen the pressure below 25 with just the boost on. In flight with the engine pump only, the pressure settles in between 23 and 24 psi. Sent from my iPad using Tapatalk
MARZ Posted August 5, 2016 Author Report Posted August 5, 2016 67 F - IO360A1A I normally start with the mixture all the way out. Throttle cracked, turn on the pump to watch the pressure increase, put the mixture in, count to four, back off the mixture complete pre start checks and hit the ignition. It normally fires in two blades, then I advance the mixture to full I've not been able to find specs for the pump Does anyone have a link? I've been seeing @ 22 with the mixture out, engine not running. Running I'm in the green arc with the engine fuel pump.
Yetti Posted August 5, 2016 Report Posted August 5, 2016 I was taught to look for a rise when the engine is running. As in when in flight, turn pump on, verify rise. Turn pump off, verify slight drop. The rise pressure does not equate to the pre start pump up number. Can't tell you the exact number. Like a couple ticks down from top of green.
Marauder Posted August 5, 2016 Report Posted August 5, 2016 I was taught to look for a rise when the engine is running. As in when in flight, turn pump on, verify rise. Turn pump off, verify slight drop. The rise pressure does not equate to the pre start pump up number. Can't tell you the exact number. Like a couple ticks down from top of green. Yetti is right. I have digital fuel pressure gauges in my F. If I am at 24 psi on the engine driven pump, I can expect to see 25 to 25.5 with the boost pump on. Sent from my iPad using Tapatalk
Marauder Posted August 5, 2016 Report Posted August 5, 2016 67 F - IO360A1A I normally start with the mixture all the way out. Throttle cracked, turn on the pump to watch the pressure increase, put the mixture in, count to four, back off the mixture complete pre start checks and hit the ignition. It normally fires in two blades, then I advance the mixture to full I've not been able to find specs for the pump Does anyone have a link? I've been seeing @ 22 with the mixture out, engine not running. Running I'm in the green arc with the engine fuel pump. I think there are probably more ways to start an IO-360 documented than anything else mechanical known to man. My cold start is throttle left at the 1000 rpm from my shutdown, mixture full rich, boost on till pressure reaches max, mixture out, boost off. Upon start, mixture in. Same two blades to start. Sent from my iPad using Tapatalk
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