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Ok i have a karcher with the 3.75 brigs and strat on it and it was running fine then it lost pressure and now will not build any back what is the problem

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Unloader valve sticking is your issue, see link to fix problem

You might want to consider replacing the unloader valve, see attached link

Posted on Oct 25, 2010

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Your uplift injector valve in the water pump is sticking. You need to remove this part. Lube the top o-ring only with a water proof grease. Reinstall this part. You will be up and running again.

You need to use needle nose vise grip tool to easily remove the valve. You need to grind down the vise grip tool to fit the opening where the valve is installed.

To prevent this problem from reoccuring use a pump guard additive.

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