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fuel tank breather on Isuzu NQR

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we had an issue on our Tymco 435 sweeper we bought used. It would only run for 150 miles on a fuel tank of fuel. The tank was bent up like it had been in an accident. Pulled the fuel outlet out to check for foreign material or plugged pipe. We replaced the tank, same problem, checked all lines and filters, no good. On the fuel filler spout, in the front, was a small breather/air filter. Took it off and inspected, plugged solid. The fuel pump on the motor had so much power it actually sucked all sides of the tank in. Once cleaned and reinstalled, truck runs great and we get the mileage from a fuel tank of fuel.

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Guest Pacific Sweeping

Wow, great find! i will keep an eye out for that! thanks for the heads up, and i am glad you figured it out! sounds like that was a tricky one to solve!

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