You must have gotten a few bad knock-offs. Damn Chinese are flooding the market with copies complete with the Walbro symbol stamped on them. One clue I hear is that some of the knock-offs don't have a polished case like the legit units. I've never had a Walbro failure. I always get mine from Racetronix. NelsonPerformance sells genuine Walbro pumps, also.
BTW, a bosch 044 pump is awesome, too, and pumps out some great volume numbers.



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