Originally Posted by xwiredx
Try using some soapy water solution to pinpoint the leak. Could possibly be a cracked manifold and those are really hard to pinpoint without soapy bubbles. If that is the case, i believe they do sell just the manifold instead of having to pick up a completely new solenoid.
Yup, that's what happened to mine.
Sounds like if your check valve is stripped out too it would just be easier to, a.) buy a whole new noid, or b.) send it in.