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 - Show Coverage: Central Illinois Strawberry Festival - by Cindy Ladage and Janna Seiz. Every year the coming of summer is highlighted by different events for different people. For some, it is heralded with the end of school, tilling the garden, or completion of the planting season. To us, connoisseurs of find food, antique tractors, farm toys, crafts, and downright fun, the annual Strawberry Festival means summer is here. Every year, in Carlinville, Illinois, the Macoupin County Historical Society and the Macoupin Agricultural Antique Association team up to fill th
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