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 Post subject: Lower the fuel pressure
PostPosted: Tue May 18, 2004 6:49 am 
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Joined: Fri Nov 28, 2003 8:02 am
Posts: 6
Location: The Netherlands
Hello,

I’ve got 2 Weber 40 DCOM carbs on my Mk3 swift Gti so I have to lower my standard fuel pressure. I hope to do this with a simple standard fuel pump of a 1.3 carb swift. Can this be done en will this work properly?


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 Post subject:
PostPosted: Tue May 18, 2004 8:29 am 
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Joined: Sun Jun 23, 2002 5:10 pm
Posts: 1644
Location: Brisbane
It should be ok...as long as you fit a good fuel reg inbetween the pump and carbs.

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Don't ask me, I don't know anything. And just because I'm a senior member, it does not mean I have as many wrinkles as ellpee. 1500+ posts and still I haven't got a clue.


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 Post subject:
PostPosted: Tue May 18, 2004 8:49 am 
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Joined: Fri Nov 28, 2003 8:02 am
Posts: 6
Location: The Netherlands
OzMidnight wrote:
It should be ok...as long as you fit a good fuel reg inbetween the pump and carbs.


A good fuel reg? You mean a fuel pressure regulator? This is also on the standard carb swift or why do I have to do this?

And does anyone know if this carb pump is plug and play on my GTi fueltank?


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 Post subject:
PostPosted: Tue May 18, 2004 2:19 pm 
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Joined: Tue Feb 10, 2004 9:45 pm
Posts: 102
Location: Seattle,Wa, U.S.A
you will also want to plumb in a return line for the fuel off of the regulator. That option should come with the regulator.

_________________
'90 Geo "Retro"- 3x Mikuni Carb 1.0
Custom ground performance Cam
Custom advanced timing cam gear
MSD 6al control, coil, wires.
2" exhaust from the hollow cat back
Short throw shift
front & rear strut bars
lowered 1.5"


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 Post subject:
PostPosted: Wed May 19, 2004 8:20 am 
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Location: The Netherlands
Mista_Shrpnl wrote:
you will also want to plumb in a return line for the fuel off of the regulator. That option should come with the regulator.


So, why do I need a new pump then? Can't I just use a regulator on my standard pump? This is about 8 bar (117 psi)? So I have to lower it to around 0,5 bar (7 psi). Or is there to much difference between those to values?


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 Post subject:
PostPosted: Wed May 19, 2004 5:23 pm 
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Joined: Tue Feb 10, 2004 9:45 pm
Posts: 102
Location: Seattle,Wa, U.S.A
Im sure you could just run the stock pump, But, i Think the contrast in pressure would lead to trouble somewhere.

_________________
'90 Geo "Retro"- 3x Mikuni Carb 1.0
Custom ground performance Cam
Custom advanced timing cam gear
MSD 6al control, coil, wires.
2" exhaust from the hollow cat back
Short throw shift
front & rear strut bars
lowered 1.5"


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 Post subject: .....
PostPosted: Wed May 19, 2004 10:39 pm 
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Joined: Sun Jun 23, 2002 5:10 pm
Posts: 1644
Location: Brisbane
Your EFI pump would have a heart attack. You need to run a low pressure pump. Bought a Facet pump for my car, new, for all of $75Aus. Chuck a filter between tank and pump and a reg inbetween pump and carbs. Plumb the carb return line onto the old EFI return line.

_________________
Don't ask me, I don't know anything. And just because I'm a senior member, it does not mean I have as many wrinkles as ellpee. 1500+ posts and still I haven't got a clue.


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 Post subject: Re: .....
PostPosted: Mon May 24, 2004 2:12 am 
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Joined: Fri Nov 28, 2003 8:02 am
Posts: 6
Location: The Netherlands
OzMidnight wrote:
the carb return line


Carb return line? Whats the carb return line?


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 Post subject: fuel pump
PostPosted: Tue May 25, 2004 5:12 pm 
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Joined: Wed Nov 19, 2003 7:35 pm
Posts: 448
Location: MISSISSIPPI
i took FI off of a ford truck that has 2 pumps one in the tank and a booster pump mid way. these make 90 psi .i hooked the fuel line to the return line with a T fitting and hooked the carb to the side of the T. with the check valve in the tank, this gives about 6 psi at the carb ( holley 600) it has run about 30 K miles with no troubles. cost $2.00.
larry


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 Post subject: Re: fuel pump
PostPosted: Thu May 27, 2004 7:48 am 
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Joined: Fri Nov 28, 2003 8:02 am
Posts: 6
Location: The Netherlands
larry griffith wrote:
i took FI off of a ford truck that has 2 pumps one in the tank and a booster pump mid way. these make 90 psi .i hooked the fuel line to the return line with a T fitting and hooked the carb to the side of the T. with the check valve in the tank, this gives about 6 psi at the carb ( holley 600) it has run about 30 K miles with no troubles. cost $2.00.
larry


That’s exactly what I'm trying to do now. I went to my local dealer an they told me to do it like that. I can at least try and see what happens. When I fail I can always buy the expensive stuff.


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