Quote:
Originally Posted by olblue81
1981 GMC longbed 2wd. .......
Is it possible for the valve to fail internally so it continues to only draw from the left tank despite the motor moving?
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Is the motor actually moving or is it just making noise? I would pull the lines off the valve and using a hose, select one of the ports and see if you can blow through the valve then switch to the other and try to do the same