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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: fuel pressure regulater
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Mon, 22 December 2003 03:43
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theoretically a fuel pressure reg will work anywhere in the system. the function is to keep the pressure AFTER the fuel pump at a given amount. frinstance, the 'returnless' pumps in newer cars DO NOT have a pressure regulator, and so do not have recirculating fuel at all!!!! the pump determines the pressure supplied, and the fuel goes from pump to injectors and never ses the tank again.
in older systems, the fuel is circulated thru the regulator to keep the pressure constant by bleeding off fuel volume.
you could have the regulator just after the pump if you wanted to.
the only reason to have it after the fuel rail is so that fresh fuel passes thru the rail all the time to keep it cool, and so that if you mash the pedal and a large amount of fuel suddenly leaves the rail vis the injectors, there is less of a hsitation before the pressure returns to normal.
in practice i don't think that is that much of a concern.
i would be happy to run a regulator before the rail and cap the end of the rail off...
then again, for aussie conditions, having fuel always passing thru the rail to keep it cooler might help prevent heat soak and any vapourisation probs...
hmmm. i guess it also helps if you have it at the end so as to be able to pass air thru it.... if there is air/vapour in the rail, and the reg is before, then the air will hav to leave by the injectors, whereas if reg is after, the pump will force the air out of the rail....
a few thoughts
Cya, Stewart
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