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Re: ejector pump uses fresh fuel from.....
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Posted by Justin VanAbrahams [Email] (#32) [Profile/Gallery] (more from Justin VanAbrahams) on Fri, 18 Mar 2016 13:44:44 Share Post by Email
In Reply to: Re: ejector pump uses fresh fuel from....., JeffD [Profile/Gallery] , Fri, 18 Mar 2016 10:24:27
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I have never tracked an XR4Ti to the point that fuel starvation would be an issue, but a friend of mine is a national champion in D Street Prepared with a VERY fast XR4Ti and he runs a completely stock setup. Look at the tires on his car - you *know* it pulls a lot of gs!

I was talking with a friend of mine at lunch and had another idea: Saab originally ran a single pump back in the '70s but then switched to a dual pump setup, as Landjet said. Maybe when they switched to the single pump they weren't confident they could abandon that feeder pump idea totally and implemented it with the siphon pump. Perhaps it's not a design necessity but the result of an uncertainty.

Given the amount of design and testing of preproduction cars that seems unlikely, but who knows with Saab. ;) I do notice that the floor the c900 tank is remarkably plain compared to every other tank on the planet. Maybe Saab's fuel pump design was to save having to mold a more complex tank. Poly tanks in the mid '80s were still somewhat of a rarity. Perhaps the fuel pump addresses an issue they could not address with the tank shape.

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