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  #1  
Old 05-19-2018, 06:03 PM
hthaman hthaman is offline
 
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Location: IL
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Default 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.
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Old 05-19-2018, 06:34 PM
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Piper J3 Piper J3 is offline
 
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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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Old 05-19-2018, 06:49 PM
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Phantom30 Phantom30 is offline
 
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Quote:
Originally Posted by hthaman View Post
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
Check your grounding cables...
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Old 05-19-2018, 06:49 PM
hthaman hthaman is offline
 
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Quote:
Originally Posted by Piper J3 View Post
Fuel pump fuse blows when? At master switch on, or when key switch is turned to rotate engine at startup?
When key switch is turned to rotate engine at startup.
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Old 05-19-2018, 07:05 PM
rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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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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Old 05-19-2018, 07:33 PM
Mich48041 Mich48041 is offline
 
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Location: Riley TWP MI
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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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Old 05-19-2018, 07:57 PM
rvbuilder2002 rvbuilder2002 is offline
 
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Originally Posted by Mich48041 View Post
It is strange that the fuel pump fuse would blow unless the pump draws more current as the voltage drops.
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)
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Old 05-19-2018, 08:25 PM
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Piper J3 Piper J3 is offline
 
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Love this forum. Its like when I was a little kid watching Mr. Wizard...
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Jim Stricker
Hinckley, Ohio
PPL/ASEL 1970 Sport Pilot since 2004
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC Jul 2012 - Bought Flying Oct 2015 with 48TT - Hobbs now 350

LSRM-A Certificate 2016
Special Thanks to EJ Trucks

Last edited by Piper J3 : 05-19-2018 at 08:29 PM.
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Old 05-19-2018, 08:25 PM
hthaman hthaman is offline
 
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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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  #10  
Old 05-19-2018, 08:31 PM
RFSchaller RFSchaller is offline
 
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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 Id check for a ground with the fuel pump motor in the circuit and then out to see if its the fuel pump motor or wiring.
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