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-   -   Fuel pump fuse blows out at each start (https://vansairforce.net/community/showthread.php?t=160595)

hthaman 05-19-2018 06:03 PM

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

Piper J3 05-19-2018 06:34 PM

Fuel pump fuse blows when? At master switch on, or when key switch is turned to rotate engine at startup?

Phantom30 05-19-2018 06:49 PM

Quote:

Originally Posted by hthaman (Post 1261133)
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...

hthaman 05-19-2018 06:49 PM

Quote:

Originally Posted by Piper J3 (Post 1261137)
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.

rvbuilder2002 05-19-2018 07:05 PM

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).

Mich48041 05-19-2018 07:33 PM

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.

rvbuilder2002 05-19-2018 07:57 PM

Quote:

Originally Posted by Mich48041 (Post 1261153)
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)

Piper J3 05-19-2018 08:25 PM

Love this forum. Its like when I was a little kid watching Mr. Wizard... :D
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hthaman 05-19-2018 08:25 PM

I start testing everything tomm, thx all

RFSchaller 05-19-2018 08:31 PM

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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