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Old 10-03-2018, 07:04 PM   #17
Tom
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Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,695
Re: Replacing a tired 350 with a L31 Vortec 350

Quote:
Originally Posted by truckster View Post
Early Subarus with electric fuel pumps had no return pump and those pumps tended to last 100,000 miles. It might shorten the pump's life some, but you might not ever notice it.
Every car made today uses a returnless regulator for emissions reasons. The pumps are built to handle it just like starters on vehicles with start/stop tech. Doesn't mean the old tech will hold up to that use.
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