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Found a red tag 5521WE pump

dieselolds

Well-Known Member
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Hey guys.I came across a reman 5521 with WE after that on eBay.It’s a red tag pump.Pictures look pretty good.I’ll post the link shortly.Any idea what WE stands for?Thanks
 
No. That is a db4. Fully mechanical. Like the db2, but uses 4 plungers instead of 2.
Desired for high rpm increased fuel output- aka makes good hot rod pump.

The problem with db4 pumps is when it wears it has a worse time idling and low rpm becomes choppy. But that doesn’t happen until over 150,000 miles. So again classifies as a hot rod pump. They were really intended for marine (boats) use.
 
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