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rangerclass7sx

´12 WR fuel pump wont prime

15 posts in this topic

hi guys my 2012 wr450f wont prime the fuel pump when i turn on the ignition switch, but i tested the pump and works fine. any pointers on where and what to check? is this common?

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Maybe it does not need priming.

The bike runs ok?

The pump filter is spotless?

the bike will not start, the pump would always turn on for second and click off like a car when you open the ignition, now it wont do that...

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the bike will not start, the pump would always turn on for second and click off like a car when you open the ignition, now it wont do that...

 

Did you test it with fuel or water for at least 5 min?

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Did you test it with fuel or water for at least 5 min?

No Sir, i ran it for a bout 30 seconds and ran perfectly fine  , im starting to think it could be switch maybe, it happened a few times a while back and i click it on and off the switch and the pump kicked in again... but nothing now... , maybe a relay? the computer speedo lights up and works fine

Edited by rangerclass7sx

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Can you elaborate on this Krannie?

 

The pump cannot be determined as good or bad until it gets hot from use.

 

It must be tested with liquid, or you will damage it.

 

It is common to see a failing pump bind up once hot, but work fine before that.

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So how would one go about doing that? Give it voltage and feed it liquid? Or test it on the bike

 

Pull the pump off the tank,  rig up a test system with a jug of liquid and hoses, and a fuel pressure guage.

 

You are looking for 65ftlbs+ for the entire test of at least 5 minutes.

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You could first try putting a meter on the pump leads to make sure your still getting voltage to the pump. That way you have isolated the problem to the the pump and not the circuitry before you go to all that trouble pulling pumps and such.

Edited by Ride-n-Hard
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You could first try putting a meter on the pump leads to make sure your still getting voltage to the pump. That way you have isolated the problem to the the pump and not the circuitry before you go to all that trouble pulling pumps and such.

Having an extensive background in electronics this is the most logical way.

Also I suspect there may be a pressure switch that turns the pump on and off which is what makes it cycle when you turn it on. You'll need to look at the schematic in the owners manual. If all the electrical checks out, then you can work the mechanical side of it

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