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  #1  
Old 01-29-2017, 07:36 AM
Dayton Murdock's Avatar
Dayton Murdock Dayton Murdock is offline
 
Join Date: Jan 2005
Location: Carson City NV
Posts: 559
Default Fuel Pump

Hi all
Yesterday I took off Carson City heading for Sacramento to see my friends.
As I leveled off at 10,500 feet I did a instrument scan in the fuel pressure was reading .6 pounds and blinking red at me , after a few moments it was reading zero .The engine was running smooth for a little bit then things got rough I turned on the boost pump and headed back to Carson. What a shame the air was smooth the snowfall on the Sierras was absolutely beautiful I could've continued on my boost pump but I thought better of that plan. I just thought I would share the experience. My new pump will be here on Tuesday and all will be better again.
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Dayton Murdock
VAF#408 RV4 N359DM O360 C/S, Dual P_Mags, AFS Efis, Trutrak A/P, Leather, Electric trim and flaps, Led lights, Freeflight ADSB and it is painted Red, Flying 1105 hrs 11/28/20

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  #2  
Old 01-29-2017, 07:54 AM
flynwest flynwest is offline
 
Join Date: May 2008
Location: Sacramento
Posts: 398
Default fuel pump

Good on ya break the accident chain at the first link.
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Horse Power is good, more is better and
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RV 8 Super charged Barrett IO-390
RV 8 Fast back built and sold
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Dan "Nordo" West
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  #3  
Old 01-29-2017, 09:10 AM
Bob Martin's Avatar
Bob Martin Bob Martin is offline
 
Join Date: Jan 2005
Location: Charlottesville, Virginia
Posts: 1,279
Default more info please

Dayton,
Good Job.
Can you give us more info on age and TT on fuel pump?
Mine is 20yrs old and 1100+ hours since new and wondering if I should replace mine as preventative maintenance. To preclude what you just experienced.
Thanks
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RV-6, 0-360 Hartzell C/S, Tip up, 1200+TT
James extended cowl/plenum, induction, -8VS and Rudder. TSFlightline hoses. Oregon Aero leather seats.
D100-KMD150-660-TT ADI2- AS air/oil seperator. Vetterman exhaust with turndown tips.
Louisa, Virginia KLKU N94TB
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  #4  
Old 01-29-2017, 10:13 AM
Dayton Murdock's Avatar
Dayton Murdock Dayton Murdock is offline
 
Join Date: Jan 2005
Location: Carson City NV
Posts: 559
Default

My fuel pump was new with the engine rebuild. it has 886 hours on it
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Dayton Murdock
VAF#408 RV4 N359DM O360 C/S, Dual P_Mags, AFS Efis, Trutrak A/P, Leather, Electric trim and flaps, Led lights, Freeflight ADSB and it is painted Red, Flying 1105 hrs 11/28/20

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  #5  
Old 01-29-2017, 10:18 AM
climberrn's Avatar
climberrn climberrn is offline
 
Join Date: Oct 2008
Location: Carson City, NV
Posts: 639
Default

I did an autopsy on mine that failed last summer. The main diaphragm was intact, but there are 2 nickel sized rubber diaphragms that act as check valves. Mine were hardened and not sealing very well.

Glad your trip back was a non issue.
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N626JA
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  #6  
Old 01-29-2017, 11:53 AM
Chkaharyer99 Chkaharyer99 is offline
 
Join Date: Oct 2011
Location: Pilot Hill, CA
Posts: 868
Default

Quote:
Originally Posted by Dayton Murdock View Post
Hi all
Yesterday I took off Carson City heading for Sacramento to see my friends.
As I leveled off at 10,500 feet I did a instrument scan in the fuel pressure was reading .6 pounds and blinking red at me , after a few moments it was reading zero .The engine was running smooth for a little bit then things got rough I turned on the boost pump and headed back to Carson. What a shame the air was smooth the snowfall on the Sierras was absolutely beautiful I could've continued on my boost pump but I thought better of that plan. I just thought I would share the experience. My new pump will be here on Tuesday and all will be better again.
Thanks for the post. Great decision. Learning/reinforcing knowledge vicariously is good.

Last week, while doing my run up my TYCO electric fuel pump toggle breaker failed. That was a no go.

Not many good options at 10.5 over the snowy Sierra's. I'm glad you're safe!
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RV-8
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  #7  
Old 01-29-2017, 12:16 PM
Leland's Avatar
Leland Leland is offline
 
Join Date: Jan 2005
Location: Livermore, California
Posts: 149
Default Weak Fuel Pump

With 850 hours since new on a new Vans O320, I noticed my fuel pressure was reading about 0.6 psi, on climb out, after shutting the electric pump off. Since the fuel pressure came up to about 5 psi with the electric pump on, I assumed that the problem was with the mechanical pump. Replacing the mechanical pump was not difficult except for safety wiring the new pump.

Leland
RV-9A with 890 hours and 11 years of flying
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  #8  
Old 01-29-2017, 02:22 PM
cajunwings cajunwings is offline
 
Join Date: Jun 2007
Location: new iberia la
Posts: 869
Default Rubber Parts

I have done a fair amount of aviation maintenance consulting and pre-buys over they years and always tell clients that after 10 years a rubber part has lived its life & doesn't owe you anything. That's every seal, o-ring, hose, diaphragm, tire, tube ect on the plane. Engine driven fuel pumps are one of those parts that maybe should be replaced at 10 years to keep trouble to a minimum.

Don Broussard

RV9 Rebuild in Progress
57 Pacer
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  #9  
Old 01-30-2017, 06:18 AM
Larry DeCamp Larry DeCamp is offline
 
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 1,157
Default Fuel Pressure Variation ?

My low pressure pump was installed maybe 5 years ago ( previous owner ) and has about 120 hours on it. The pressure goes low sometimes and back to normal, about 2-3 psi fluctuation. Boost pump always raises the pressure to normal. What causes fluctuation in the mechanical pump?
Also, if I climb to 8,500 MSL, pressure drops to bottom of green and returns to normal at 500 MSL (airport) for either pump. The OP goes down 5 psi also . Reducing atmospheric pressure should increase the gauge reading assuming the fluid pressures are controlled by springs in the fuel pump and OP relief valve. What am I missing ?
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RV-4 fastback in process w/ Superior roller 360/AFP/G3X/CPI/Catto3b
Clinton, IN
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  #10  
Old 01-30-2017, 06:41 AM
rv8guy's Avatar
rv8guy rv8guy is offline
 
Join Date: Jan 2005
Location: Watkinsville, GA
Posts: 633
Default

Good job Dayton. Keep em flying
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"Miss Sue"

RV-8 80749 slow build taildragger
7.5 year build first flight Dec 2005
SOLD at 540 hours and 10 years of FUN
N68AK
Watkinsville, Georgia
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