scootz
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| posted on 9/11/07 at 05:11 PM |
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Carb's to TB's... Again.... !!!
Let me double check this is right before I start ordering 'bits' :-
Tank to Old Carb Fuel Pump...
Fuel Pump to Old Low Pressure Regulator...
Old Low Pressure Regulator to Swirl Pot...
Swirl Pot to New Injection Fuel Pump...
New Injection Fuel Pump to New High Pressure Regulator...
New High Pressure Fuel Pump to Fuel Rail....
Fuel Rail return to Swirl Pot.
Quick questions -
1. Do I really need 2 regulators?
2. Where about in the sequence should I place the Fuel Filter?
Cheers all
Scootz
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phoenix70
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| posted on 9/11/07 at 05:14 PM |
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Quick questions -
1. Do I really need 2 regulators?
2. Where about in the sequence should I place the Fuel Filter?
Cheers all
Scootz
To Answer your questions
1 No you don't
2 Fuel filters before low pressure pump and after high pressure pump, some may also suggest after low pressure pump too.
The correct layout for Fuel Injection is below:
Tank to Old Carb Fuel Pump...
Old Carb Fuel Pump to Swirl Pot...
Swirl Pot to New Injection Fuel Pump...
New Injection Fuel Pump to Fuel Filter
Fuel Filter to Fuel Rail....
Fuel Rail to New High Pressure Regulator...
New High Pressure Regulator return to Swirl Pot.
Also remember High pressure pumps don't suck very well so make sure and mount the swirl pot higher than the HP pump.
[Edited on 9/11/07 by phoenix70]
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matt_claydon
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| posted on 9/11/07 at 05:18 PM |
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Regulator goes after fuel rail, in return to swirl pot.
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scootz
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| posted on 9/11/07 at 05:27 PM |
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Cheers chaps... I knew I'd cocked up somewhere!
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BenB
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| posted on 9/11/07 at 05:45 PM |
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You don't need two regs as said.
To be honest it doesn't particularly matter where you put the filter. Crud should only be entering the system via the petrol pump(!) so as long
as you've got a filter somewhere between the tank and the injectors you should be fine. That being said, injection filters screen better than
some carb filters so I'd use an injection petrol filter after the high pressure pump...
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dave1888
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| posted on 9/11/07 at 06:26 PM |
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Does this help.
 
Rescued attachment fuel inj.gif
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Schrodinger
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| posted on 10/11/07 at 02:15 PM |
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You should have a return from the swirl pot to the tank as well.
Keith
Aviemore
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ecsjwhi2
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| posted on 10/11/07 at 02:34 PM |
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Just 2 points
1 if you do not filter before high pressure pump you WILL be buying regular replacements. The tolerances on injection pumps are quite tight, one loose
bit of crud from the tank can lock up the pump.
2 I have seen the internals of cheap plastic filters collapse under vacuum, make sure it is an injection filter.
Cheers
JohnW
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scootz
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| posted on 10/11/07 at 05:33 PM |
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Cheers guys.
Was just wondering about the need for a return from swirl pot to fuel tank - is this really necessary?
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scootz
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| posted on 10/11/07 at 09:08 PM |
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Found this diagram on the net.
Bit confused now as I always thought of a fuel rail as having a feed at one end and a return at the other...
Assuming the swirl pot / fuel pump were placed as recommended in this thread, then is this (diagram) perfectly acceptable?
LINKY-LINK
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Jenko
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| posted on 14/11/07 at 07:48 PM |
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I would say no.....
With bikes where the fuel pump is mounted directly above the TB's (as is the fuel tank), it tends to be easier to regulate the fuel pressure...I
think (but am not sure), the bike pumps can effectively keep a nice constant pressure...
However, If you are using a car fuel injection pump to pump fuel from the rear, then you will need a way of regulating the pressure...This is done
with a 3 bar reg on the 'outlet' of the fuel rail...of course, this requires the excess fuel to go somewhere, and as previously mentioned,
this is to the swirl pot.
So, your fuel system ideally looks like this:
tank > Inline filter > low pressure (lifter pump) > Swirl pot (top)> feed to High pressure pump > High pressure filter > fuel rail
in > fuel rail out and straight into fuel pressure reg > back to swirl pot (top) > Swirl pot over flow > back to main tank
I'm doing a megasquirt conversion at the mo using GSXR 600 TB's......
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Doofus
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| posted on 14/11/07 at 11:44 PM |
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My setup is just like that "returnless" diagram in the link.
My pump and reg are in the boot and works a treat.
I know of a few other cars that run like that as well.
New Mondeos don't have a return from the fuel rail either.
Paul.
[Edited on 14/11/07 by Doofus]
[Edited on 14/11/07 by Doofus]
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