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How many amps would a fuel pump draw? 

 

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 Post subject: How many amps would a fuel pump draw?
Posted: Fri Oct 05, 2007 11:58 pm 
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I have a CAPA Vortech T-Rex Fuel Pump (http://capa.com.au/vortech_fuel.htm):

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Anyone know roughly how many amps one of these would draw when running? 5, 10, 15? I've got to get some wire to wire her up tomorrow. And I want to run a fuse.

 

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Posted: Sat Oct 06, 2007 12:34 am 
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gestimate, around 7-10amps

nothing wrong with overrated cables!

 

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Posted: Sat Oct 06, 2007 10:13 am 
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Krytox wrote:
gestimate, around 7-10amps

nothing wrong with overrated cables!


Yeah, but I'd like to have the fuse pretty close...

 

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Posted: Sat Oct 06, 2007 10:34 am 
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get a multimeter and wire it up in series with the positive and turn it on, block off the outlet and read it?

or contact the distributor?

 

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Posted: Sat Oct 06, 2007 1:22 pm 
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You can do what Krytox said...or just get a multimeter measure the resistance of the pump, then use V = IR rule and you can work out the amps drawn using either 14.4V or 12V.

I would think about 10A.

phong =P~

 

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Posted: Sat Oct 06, 2007 3:06 pm 
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phongus wrote:
You can do what Krytox said...or just get a multimeter measure the resistance of the pump, then use V = IR rule and you can work out the amps drawn using either 14.4V or 12V.

I would think about 10A.

phong =P~


I'm not real keen on running a $300 pump dry...

 

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Posted: Sat Oct 06, 2007 3:07 pm 
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Krytox wrote:
get a multimeter and wire it up in series with the positive and turn it on, block off the outlet and read it?

or contact the distributor?


They're closed on the weekend.

Ah well, I'll sort something otu.

 

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Posted: Sat Oct 06, 2007 3:11 pm 
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Whats the problem with the fuse? Run down to a Jaycar store, and get them to do the work for you, as a bonus, they have the appropriate fuse holders/wire and terminals for the job.

 

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Posted: Sat Oct 06, 2007 8:12 pm 
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twr7cx wrote:
phongus wrote:
You can do what Krytox said...or just get a multimeter measure the resistance of the pump, then use V = IR rule and you can work out the amps drawn using either 14.4V or 12V.

I would think about 10A.

phong =P~


I'm not real keen on running a $300 pump dry...


You aren't running it dry. You just need to work out the total internal resistance of the unit using the multimeter. Pump isn't running.

Then use either 12V or 14.4V as your voltage in the V = IR rule and you can work out how much Current the pump draws. I = V/R...

Or am I missing something?

phong =P~

 

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Posted: Sat Oct 06, 2007 10:33 pm 
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Nah phong, your right.

Measure the pump resistance with a multi meter (no need to have the pump running at the time) and substitute into V=IR, (I=V/R)

So current drawn = 12 divided by the pump resistance.

 

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Posted: Sat Oct 06, 2007 10:49 pm 
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Ah I'm with it now! Cheers, I'll give it a crack tomorrow morning!

 

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Posted: Sat Oct 06, 2007 10:50 pm 
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Whiteknight1 wrote:
Whats the problem with the fuse? Run down to a Jaycar store, and get them to do the work for you, as a bonus, they have the appropriate fuse holders/wire and terminals for the job.


Already got the stuff.

 

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Posted: Tue Oct 09, 2007 11:51 am 
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V=IR will not work with a fuel pump.
Due to back EMS. Electric motors when starting draw a lot more current than when running.
This is what an electrical engineer told me the other day.


The answer is, according to CAPA, who I just wrang, 6 - 8 Amps on start up, and then settles down to about 3 -4 A.

So all good now.

 

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Posted: Tue Oct 09, 2007 12:10 pm 
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Also the current draw will depend on how hard the motor has to work. It's usually best you run your pump in fuel and measure the current draw if you have no OEM specs to work with.
Can you use the existing fuel pump wiring ??
It will be able to handle the specs you mention reasonably easy (single pump that is).

 

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Posted: Tue Oct 09, 2007 2:55 pm 
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This isn't replacing the factory wiring, it's a secondary pump with a boost sensor on it, comes on when on boost. The wirings able to hold 15 amps constantly, so I think that should be sufficent consider CAPA reckon it'll only draw half of that.

 

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