YZ250FX fuel pump quit

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8/1/2017 5:16 PM

An hour into my ride tonight my bike died. It felt like it ran out of gas. Fuel pump is not priming so I'm assuming the pump is not working. I have not heard of any fuel pump issues on these bikes. Anyone know where to start or possible causes?

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8/1/2017 7:28 PM

I just fixed a local bike that did the same thing. It turned out to be that the pet cock came apart internally and stopped the fuel flow.
On another one I found a dirty electrical connection to the fuel pump.
If your bike has an inline filter it too should be checked.
Most bike have a fuel pump relay and most have a fuse that can go bad.

Paw Paw

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8/2/2017 4:46 AM

Anyone know where the oump relay is? Manual is not very clear.

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8/2/2017 7:44 AM

It should be mounted next to the starter relay right by the battery.

Paw Paw

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8/2/2017 2:41 PM

Got it fixed. Tested the pump with direct power and it wouldn't run. Figured it was bad. Was right about to order a new one and figured I better pull the old one out first and bam! Photo

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8/2/2017 5:00 PM

Yes, I have seen that before too, but mostly on KTM's.
Great find.

Paw Paw

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8/2/2017 5:21 PM

Paw Paw wrote:

Yes, I have seen that before too, but mostly on KTM's.
Great find.

Paw Paw

Thanks for your suggestions. Got me looking in the right direction.

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8/2/2017 7:33 PM

Tuna wrote:

Got it fixed. Tested the pump with direct power and it wouldn't run. Figured it was bad. Was right about to order a new one and figured I better pull the old one out first and bam! Photo

I've seen the race teams saftey wire those connections on or heat shrink wrap them tight.

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8/3/2017 5:10 AM

Yup, I shrink wrapped it good. No idea what happened to the original from the factory.Photo

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