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05-19-2018, 06:03 PM
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Join Date: Jan 2014
Location: IA
Posts: 56
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Fuel pump fuse blows out at each start
Hi all, can someone please point me in direction of troubleshooting of at each start fuel pump fuse blows out, starter feels sluggish in rotating the prop, battery is sufficiently charged. Thanks in advance.
Rds
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05-19-2018, 06:34 PM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,065
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Fuel pump fuse blows when? At master switch on, or when key switch is turned to rotate engine at startup?
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Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622 
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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05-19-2018, 06:49 PM
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Join Date: Jul 2009
Location: Coeur d'Alene, ID/Casa Grande, AZ
Posts: 654
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Quote:
Originally Posted by hthaman
Hi all, can someone please point me in direction of troubleshooting of at each start fuel pump fuse blows out, starter feels sluggish in rotating the prop, battery is sufficiently charged. Thanks in advance.
Rds
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Check your grounding cables...
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Ric Dickison
307 (CAB) Phantom
Search and Destroy (Can Tho RVN)
Distinguished Flying Cross Society Member
CH-47 & UH-1H "Driver"
Rotax 9 Series Service IRMT
RV-12 Kit#729 "N312RD" is now a full functioning fun machine!! Thanks Van for fulfilling my dream😎
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05-19-2018, 06:49 PM
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Join Date: Jan 2014
Location: IA
Posts: 56
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Quote:
Originally Posted by Piper J3
Fuel pump fuse blows when? At master switch on, or when key switch is turned to rotate engine at startup?
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When key switch is turned to rotate engine at startup.
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05-19-2018, 07:05 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Something is pulling your battery voltage low.
Either it isn't as fully charged as you think, or you have a poor battery cable connection (power or ground).
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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05-19-2018, 07:33 PM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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Check all battery and starter cables and connections, both positive and negative.
What size fuse is blowing, 5 amps?
It is strange that the fuel pump fuse would blow unless the pump draws more current as the voltage drops.
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Joe Gores
RV-12 Flying
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05-19-2018, 07:57 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by Mich48041
It is strange that the fuel pump fuse would blow unless the pump draws more current as the voltage drops.
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Power formula - P (watts) = E (voltage) X I (amps of current)
If P is somewhat a constant, as in the power in watts required to make a device operate under it's normal load (in this case , the fuel pump), and the voltage dips, the current will increase (within the limits of the ability for the battery to supply it anyway)
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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05-19-2018, 08:25 PM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,065
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Love this forum. Its like when I was a little kid watching Mr. Wizard... 
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__________________
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Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622 
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
Last edited by Piper J3 : 05-19-2018 at 08:29 PM.
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05-19-2018, 08:25 PM
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Join Date: Jan 2014
Location: IA
Posts: 56
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I start testing everything tomm, thx all
Last edited by hthaman : 05-19-2018 at 08:28 PM.
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05-19-2018, 08:31 PM
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Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,820
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Is this an initial startup, or did the problem develop. Initial startup after construction suggests a wiring error or wiring damage (cut though insulation to ground?). If it developed at least you know it was right when you finished construction and I?d check for a ground with the fuel pump motor in the circuit and then out to see if it?s the fuel pump motor or wiring.
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