post weber change, return fuel line
Posted
#1390768
(In Topic #182613)
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however just wondering if i need the return fuel line from the vapour separator after installing a weber carb.
symptoms i have currently are as follows:
so after running my car until the engine is normal operating temp, and then i switch it off to go to the shops etc.
then when i come to start the car it struggles to get going, needing a tease of the pedal to eventually fire up :/
however if i turn the car off run in and out the shop it almost seems to start before i turn the key it is that quick!
i think it has something to do with the return line of the fuel system adding air into the system, when the engine is switched off.
this is backed up with the amount of bubbles running through the return line on start up.
my question is this, do i need it?
i read somewhere that the weber carb has provisions to mean i don't need the return line, but wanted to double check before removing it or clamping it off or does anyone know what else might be causing this?
thanks
Last edit: by jaaquo
Posted
MOTY 2013
worst case yes you can remove the separator entirely and clamp the return plenty have done this without problems
Hello my name is John and I'm a dub addict.
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My wiring diagrams and other documents have moved here:
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Posted
Posted
Secretary
Having just refurbished the carbs I know that the petrol being admitted to the bowl is regulated by a needle valve which is connected to the floats.
Last edit: by Macca
First Golf, lots of work. I've started so I'll finish!
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Posted
MOTY 2013
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
Posted
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The heat from the manifold is boiling the fuel and venting via the hole in the top of the carb body hence it needs a pump of fuel from the accelerator pump circuit to get it going.
The vapour seperator and return line have no use when running a weber so you can remove it all.
In regards to tuning it first ensure it's jetted correctly. The carb is used on a wide range of engines all requiring different jets. It's not uncommon for it to have the wrong jets meaning no amount of primary circuit tuning will get it running properly.
Posted
Old Timer
1985 Cabriolet GL
Posted
MOTY 2013
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
Posted
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Leaving it in place isn't an issue it's just not needed on a weber plus it just adds up to another point of failure and the reason everyone changes from the pierburg to a weber is because of the overly complicated design which once ages adds many points of failure.
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