The check valve, if it has one, will be in the base of the pump, not the pipe.
Any chance you swapped the feed wires to that pump ? Most have a permenant magnet field motor on them, which will run backwards and not pump if the polarity is reversed.
A couple years ago during crop spraying season, I came home with the sprayer to find my totally frustrated brother in the final stages if disassembling the 12V herbicide pump. I asked what the problem was ? He said, the durn thing runs good, but will not pump a drop of liquid. I helped him finish disassembling the last of the pump and found nothing wrong. About then, the little light bulb went on in my head. I asked, did you watch the battery polarity when you hooked the pump clips on ? His only reply was a deer in the headlights look. I looked at the battery, and sure enough, red clip on neg and black on pos. We reassembled the pump, correctly connected the battery and the pump worked great ;-)
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Today's Featured Article - On the Road with Dave Gohl: Deere Departed Friend - by Dave Gohl. Have you ever had to part with a dear friend? It's not easy. If it's due to death, your feelings could be in disarray for days, months or even years. Even now after almost 4 years, I still miss my dad. I remember when I was a kid my dad sometimes would tuck my brother and I in at night and we would ask him questions about his childhood on the farm. To this day, it's some of the best stories I've ever heard. And now, I'm so glad that I asked those questions, and if I were a little smarter i
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