Simon
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| posted on 6/8/07 at 10:32 PM |
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FI Fuel return line - can I do this?
Peeps,
Going to fit a new fuel line to allow fuel back from pressure reg, but instead of going into tank, can it go into a "T-piece" behind fuel
filter and pump - basically return to the fuel line after it has left tank, but before pressurised.
Thanks
ATB
Simon
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ReMan
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| posted on 6/8/07 at 10:54 PM |
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I know very little about FI, but I would guess the answer would be no, coz it's too simple!
IMHO it would fail, becuse unless there was always fuel in the return line, then potentially the pump would try to suck air from the return line
rather than fuel from the tank.
Some FI expert tell me i'm way out???
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Doofus
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| posted on 6/8/07 at 11:03 PM |
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Oooops misread the post... Ignore me... See above :-D
[Edited on 6/8/07 by Doofus]
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Dusty
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| posted on 7/8/07 at 12:29 AM |
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Don't like the idea due to the recirculation of the same bit of fuel (and air). Any air can only escape through the injectors. Fuel may get hot
and cause vapourisation problems. Better to put in a swirl-pot and return it to that. If the lifter pump feeds into the pot at mid level and the
return fuel line higher up then warm fuel returns to the tank. Also stops surge.
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mark chandler
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| posted on 7/8/07 at 07:56 AM |
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Just dump the return into a swirl pot on the scuttle, retain the existing low pressure side to the front of the car, save running a tank return with
added benefits.
Away you go, jobs a good un.
Regards Mark
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Simon
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| posted on 7/8/07 at 10:04 PM |
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Mark,
You lost me
I'm guessing that I use existing pump (4.5psi) to get fuel to front of car, then use FI pump into fuel rails, take off to pressure reg - excess
from there to swirl pot and from there into low pressure pipe.
Does that sound right
ATB
Simon
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peterrosey
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| posted on 7/8/07 at 11:11 PM |
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I had all manner of fuel injection problems until I switched to using a swirl pot - definitely the best way to do this.
Run the low pressure pump into the swirl pot (2nd inlet from top).
Plumb the fuel return line from the pressure reg into the highest point on the swirl pot.
Finally take the feed to the high pressure fuel pump from the lowest point of the swirl pot.
Hey presto1 No more fuel starvation or air bubbles...
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Simon
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| posted on 8/8/07 at 07:06 PM |
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Cheers chaps
Gotta find a swirl pot now
ATB
Simon
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ady8077
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| posted on 12/8/07 at 12:39 PM |
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quote:
Originally posted by mark chandler
Just dump the return into a swirl pot on the scuttle, retain the existing low pressure side to the front of the car, save running a tank return with
added benefits.
Away you go, jobs a good un.
Regards Mark
Hi
Wont you still need a return pipe from the swirl tank to the main tank? How do you get rid of the air in the swirl tank?
Adrin
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