weber 500 carb fuel return

Mongman · Post by **Mongman** » Tue Jul 08, 2014 8:00 pm

hey. getting my land rover project finished and need to fit a return feed from the carb. any idea of how to? is there an overflow pipe? using an electric fuel pump so need some way to take the surplus back.

JSF55 · Post by **JSF55** » Tue Jul 08, 2014 8:09 pm

Doesn't come with a return, ideally you need a regulator to keep it down to about 5 psi

sidecar · Post by **sidecar** » Tue Jul 08, 2014 8:41 pm

Many electric pumps are low pressure and have an internal bypass, this means that you can simply connect the pump to the carb with no return line at all, this is known as a 'dead'head' system. The pump must have an internal bypass with this setup so that it does not stall when the carb does not require fuel.

Eliot · Post by **Eliot** » Tue Jul 08, 2014 9:38 pm

When i replaced my SU's with a webber 500, i kept the old return pipe but fitted a restriction (and old jet) into the pipe. The theory was you wouldn't end up with boiling hot petrol in the pipework when the engine was stopped. This was on my 4x4, where you would park up, stall or get stuck in mud - typically with a roasting hot engine.

mgbv8 · Post by **mgbv8** » Wed Jul 09, 2014 8:34 pm

Mongman wrote:hey. getting my land rover project finished and need to fit a return feed from the carb. any idea of how to? is there an overflow pipe? using an electric fuel pump so need some way to take the surplus back.

What pressure does the pump dead head at??

DaviesDJ · Post by **DaviesDJ** » Thu Jul 10, 2014 5:46 am

Hi there - I have run weber/Eddie 500/600 carbs on landies for ages and never used a return, just blocked off at the tank. Put the carb on a phenolic spacer, buy a basic fuel regulator - but the carb will take 8psi - and just run it in direct. Never had a problem with boiling.

Mongman · Post by **Mongman** » Fri Jul 11, 2014 4:02 pm

so how do I stop over fuelling the carb?

sidecar · Post by **sidecar** » Fri Jul 11, 2014 5:00 pm

Mongman wrote:so how do I stop over fuelling the carb?

The carb itself should stop it getting 'overfueled', the float valves will shut off. This is provided you are using a suitable pump, not an EFI pump or even a carb pump that delivers too much pressure. The Eddy manual states that you need 6.5 PSI, I suspect that it would still be OK with 8 PSI but not anything higher.

Mongman · Post by **Mongman** » Sat Jul 12, 2014 10:48 am

Now to find the pressure of my pump!

Denis247 · Post by **Denis247** » Sat Jul 12, 2014 3:02 pm

Mongman wrote:Now to find the pressure of my pump!

Unless it's a fuel injection pump it should be ok

I've run a Facet Red Top for years with no problems. Just try it and see before you go to the bother of measuring pressure.

stevieturbo · Post by **stevieturbo** » Sat Jul 12, 2014 3:32 pm

Mongman wrote:so how do I stop over fuelling the carb?

Simple, a fuel pressure regulator.

Mongman · Post by **Mongman** » Sat Jul 12, 2014 9:43 pm

it's the simple cylinder shape with a pipe in and out either end

dava · Post by **dava** » Tue Aug 11, 2015 8:59 pm

fitted a different engine in my landy110 came with eddy and fuel regulator started it over fueled backfired caught fire did this far to many times before i realised faulty regulator now use return hose with mig tip restrictor runs fine
used a full size extinguisher Co2 till empty always have one to hand now when working and driving

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weber 500 carb fuel return

weber 500 carb fuel return

Re: weber 500 carb fuel return

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