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Fuel pump blowing a fuse?

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pete(at)wort.org
Guest

Posted: Sat Jun 16, 2007 5:12 pm Post subject: Fuel pump blowing a fuse?

Sequence goes like this:



Master on, fuel pump on, silence (except for the gyros spinning up.)



Strobes, fuel pump, and starter are on the same fuse.



What about a fuel pump would cause this problem?  Is is a wiring issue

inside the pump body, or more likely some short otherwise.



Testing the circuit with the battery disconnected shows good connectivity

through the fuse.  No short between the power source and the fuse body. 

Replace fuse, master on, stobes work.  Strobes off, fuel pump on, blown

fuse.



Anyone had this experience before?  Is is just a common fuel pump failure?



Thanks for the input.



PETE

Tiger N45319

Leesburg, VA

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flyv35b(at)minetfiber.com
Guest

Posted: Sun Jun 17, 2007 5:14 am Post subject: Fuel pump blowing a fuse?

 	  Quote: 	
		   Testing the circuit with the battery disconnected shows good connectivity

 through the fuse.  No short between the power source and the fuse body.

 Replace fuse, master on, stobes work.  Strobes off, fuel pump on, blown

 fuse.



 Anyone had this experience before?  Is is just a common fuel pump failure?


	


If turning on the fuel pump is what is blowing the fuse, then it sounds as 

if there is a short to ground in the wire between the switch and the pump OR 

possibly an internal failure inside the pump which is also a short to 

ground.  I'd look at where the wire goes through the firewall first.  If the 

pump just doesn't work but the fuse is OK then you need to check the voltage 

at the pump.  Cut the but splice connector at the pump and check the voltage 

there.  If voltage is OK then replace the pump.  They are very durable but 

they don't last forever.



Cliff  A&P/IA 

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peter(at)linn-mathes.com
Guest

Posted: Sun Jun 17, 2007 7:25 am Post subject: Fuel pump blowing a fuse?

I had the same problem about a month ago.  I found the fuse was getting

blown after the strobe lights were turn on.  This only happens

intermittently.  I checked the wingtip strobe tubes and found the right

wing tube had turned black.  I replaced the tube and the fuse has not

blown since.  Hope this helps.



Peter Wei

N26986 Cheetah



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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Mon Jun 18, 2007 12:58 am Post subject: Fuel pump blowing a fuse?

I isolated a bad fuel pump by installing an in-line fuse in the wire to 

the electric fuel pump.  So, in effect, I had two fuses to the fuel 

pump.  The closest fuse will blow first.  I think I used a 5 amp fuse.  

It turned out the pump was failing.  Replacing the pump stopped the 

problem.

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Gary
AuCountry Aviation
Home of Team Grumman

flyv35b(at)minetfiber.com
Guest

Posted: Mon Jun 18, 2007 4:52 am Post subject: Fuel pump blowing a fuse?

As I mentioned you could have accomplished the same thing with the panel 

mounted fuse by cutting the wire to the pump turning on the switch and then 

temporarily shorting the two wires you cut together.  Either way you found 

the problem.  A good modification to the electrical system is to put the 

electric fuel pump on it's own circuit I think.



Cliff  A&P/IA

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