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 - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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