David Jenkins
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| posted on 19/10/05 at 12:27 PM |
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DGAV return pipe?
Just picking up on a point that MikeR raised (in 'Plastic Tank' ) - I didn't want to hijack that thread.
He says that his DGAV setup requires a return pipe to the tank - now I have a DGV (manual choke!) that has the Y-shaped inlet, but only one connection
spigot, so currently it's not possible to fit a return pipe. I'm using the engine's mechanical pump, BTW.
Is a return pipe normal, or required with the mechanical pump?
rgds,
David
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DarrenW
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| posted on 19/10/05 at 12:31 PM |
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i dont know if thi shelps you but im using a 38DGAS on a Pinto with mech pump and no return pipe. It runs fine like this. My carb also has the y
shaped inlet but only one side is open. There must be another carb set up that has the other side open for the return.
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flak monkey
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| posted on 19/10/05 at 12:32 PM |
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There are so many configurations of fuel lines on Weber carbs, even ones with the same numbers seem to be different.
If it only has one fuel connection then you dont need a return, since you are using the mechanical pump it will be OK.
Now my DGMS has a fuel feed and return...so looks like I will running a return...
David
Sera
http://www.motosera.com
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MikeR
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| posted on 19/10/05 at 12:39 PM |
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i should add, i've got a spare DGAS that doesn't have a return. I'm using the one with because its known good (came from a running
engine) and at some point i intend fitting fuel injection where i will need a return.
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Mike R-F
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| posted on 19/10/05 at 01:30 PM |
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DGAS on my Essex V6 has Y inlet but no return. It's run like that for the past 35 years, no problems.
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MkIndy7
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| posted on 19/10/05 at 07:48 PM |
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oops just part hijacked the other thread lol
Theres some very mixed answers on plumbing the return in pre pump.
We've been told a few times that this "works" although have never seen it.
We have tried it once on another car and the engine wouldn't run (or start maybe) until this link was shut off,
we presume because the fuel was short circuiting and just pumping round the return.
We've got a "return pot" thing off the donor, I think the technical term might be a pressure regulator/vapour seperator on a 32/34
DGAV and in the time it takes to idle and reverse into the garage (2mins?) it once filled a 1L pop bottle!
So all that extra fuel must normally go somewhere, and others have commented on much better fuel economy with them fitted.
[Edited on 19/10/05 by MkIndy7]
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chrisg
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| posted on 19/10/05 at 08:43 PM |
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I've got a 32/36 fitted with a return and as it's a transparent pipe I can always see fuel in it.
Ford don't usually put anything on there you don't need!
Cheers
Chris
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paulf
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| posted on 19/10/05 at 08:49 PM |
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I plumbed the return on my 32DFT to a tee piece on the suction side of the pump.The only problem I have had is that if the car is left for a few days
it is hard to start, as i think the float bowl emptys by evaporation and allows the pump to suck air in through the return line.I bought a Sierra
vapour seperator and regulator from the scrapyard but never got around to fitting it, I am now fitting fuel injection so will have to install a return
line anyway.
Paul.
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Hornet
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| posted on 20/10/05 at 09:34 AM |
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For info.... the return line on the later models of DGAV Webers was to prevent stalling on idle when the engine was very hot causing the fuel to
evapourate.
On my Locost my ali tank only had one pipe fitted so I blanked of the return line form the carb.
Car drives like a dream and has nevered stalled.
Hope this helps.
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