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Re: 1990+ Fuel Pump Theory Posted by JeffD [Email] (#1885) [Profile/Gallery] (more from JeffD) on Thu, 17 Mar 2016 13:20:47 In Reply to: Re: 1990+ Fuel Pump Theory, Justin VanAbrahams [Profile/Gallery] , Thu, 17 Mar 2016 01:08:58 Members do not see ads below this line. - Help Keep This Site Online - Signup |
On other cars, how is the bucket (if there is one; sometimes isn't it just a low spot in the fuel tank) actually kept full of fuel from the main tank?
Since there's always less fuel coming back from the rail than being supplied, without a pre-pump, or holes near the bottom of the bucket, the bucket would drain.
I'd suggest that this Saab design came to be when an engineer was asked to try to keep air/returning fuel vapor out of the pump with just one fuel pump, and sketched up a swirl pot with a nozzle on it to get circumferential flow.
He then realized that the nozzle looked like a jet pump, and might as well be used to continuously push fresh fuel,from the fuel tank, through the swirl pot/bucket, and overflow back into the fuel tank.
Perhaps the engineer was a Scania diesel guy, and as I understand it diesels _really_ don't like air in the lines, and he pulled from that background.
Or, maybe he had a summer cabin off-grid in the Swedish back-country and used a jet pump plumbed from a high mountain lake to pump irrigation water to his summer potatoes - who knows?
Weird (tidy and clever in my book) design decision, then!
->Posting last edited on Thu, 17 Mar 2016 13:27:01.
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