bakerocb
Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA
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 Posted: Mon Oct 28, 2013 6:51 pm Post subject: Fuel pump |
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10/28/2013
Hello Tim, You wrote:
1) “I don't recall if there is a Min. / Max. pressure for the boost pump. Do you know?”
On page 12 of the publication MODEL SPECIFICATION AIR COOLED AIRCRAFT ENGINE MODEL IO-240-B 125 BHP (at) 2800 RPM ORIGINAL ISSUE April 21, 1995
Revision May 15, 1996 it says:
“5.4.4 Fuel Pump Pressure
a. Pump inlet, MaX allowable psig (kPa) +6.0 (41.4)
b. Pump inlet, Min allowable psig (kPa) -2.0 (-24.2)
c. Vapor return outlet, Max allowable psig (kPa) +3.5 (24.2)”
2) “I think the Manuel calls for 35 / 53# un metered (at)2800 rpm, after the throttle body, I think, I don't have the book with me.” and “Any thoughts or suggestions?”
SID97-3F CONTINENTAL MOTORS, INC. (CMI) CONTINUOUS
FLOW FUEL INJECTION SYSTEMS ADJUSTMENT SPECIFICATIONS AND
INSTRUCTIONS dated 2013-05-10 would be a good place to start.
OC
======================
From: Tim Yoder (ftyoder(at)yoderbuilt.com)
Sent: Thursday, October 24, 2013 7:02 PM
To: bakerocb(at)cox.net (bakerocb(at)cox.net)
Subject: Fuel pump
Hello OC,
My new pump was to ship yesterday, I hope to have it in a few days. In the meantime I changed the inline fuel filter and checked the pressure that my electric boost pump out. It is 20#, I think the Manuel calls for 35 / 53# un metered (at)2800 rpm, after the throttle body, I think, I don't have the book with me. I don't recall if there is a Min. / Max. pressure for the boost pump. Do you know?
I took the old pump apart and couldn't see any thing broken. I put it back together and ran it with a drill and it went to 30# and leaked a stream out of the mixture control end, like I saw on the ramp, with the boost pump on. I plan on checking the rest of the fuel lines for blockage or debris as I put the new pump on and check the un metered pressures.
Any thoughts or suggestions?
Tim
[quote][b]
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