Re: pre-pump explained - Saab 900 Bulletin Board - Saabnet.com
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Re: pre-pump explained
Posted by thereuare (more from thereuare) on Fri, 19 Sep 2003 19:55:00
In Reply to: Re: try this ---, bubba, Fri, 19 Sep 2003 19:04:17
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The fuel pump actually consists of a pump and a pre-pump. I've never actuall seen it, but it's easy to visualize if you think of a pump that sits in your fuel tank at the half way point. It easily takes in fuel when the fuel is above the pump's intake level, but when the tank is less than half full, there is a pre-pump that takes the fuel from the lower half of the tank and feeds the main pump (this is why the pre-pump is also often refered to as a feeder pump).
Many repair shops will replace the whole pump when it's really only the pre-pump that needs replacing.
Before you do anything you NEED to get a Bently manual as it will pay for itself in no time at all. In the meantime, keep your tank more than 1/2 full :)
posted by 68.193.225...
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