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Old 30 April 2018, 08:46 AM
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Henrik
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Default Alternative fuel rail design



Just sat on train musing.. would the above be an improvement on the Impreza fuel rails?

To my mind you'd get exactly the same pressure at the injectors, if the legs of the bottom t were kept the same length.

Also there would be less connectors (eg fpr and t piece could be directly plumbed together) and in fact the bottom t could come off that "lump" too.

No fuel hoses above turbo either.

Why would it not work?

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Old 30 April 2018, 09:14 PM
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edsel
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I can't see why not but have a theory: A pressrurised circuit/loop on a conventional parallel system will have more fuel in the pipes under pressure. Will the one pipe T'd off to the two rails be able to supply as much fuel?
Old 30 April 2018, 10:27 PM
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1509joe
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I wouldn't think so another thing that would concern me is that any particles/sludge that dries out as a white residue (in theory there shouldn't be any) would have no escape back to the tank via return line.
Old 01 May 2018, 08:14 AM
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Henrik
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I had a natter with a friend of mine yesterday regarding this, and he pointed out that they wouldn't necessarily bleed properly either.

I.e if the pickup ran dry on a corner, then all the air that got introduced would have to come through the injector, whereas on a conventional system most of it would end back up in the tank.
Could potentially be mitigated with a swirl pot, but that feels like a sticking plaster.


It's a shame, would have been nice to get rid of a bunch of pipes/connectors.
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Old 02 May 2018, 11:11 PM
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360ste
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A proper parallel fuel setup is best.
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